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be quiet! Pure Power 13 M 1200W vs CORSAIR RM850x SHIFT (2025)

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Product A: be quiet!

Pure Power 13 M 1200W

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Product B: CORSAIR

RM850x SHIFT (2025)

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Abe quiet! Pure Power 13 M 1200W

BCORSAIR RM850x SHIFT (2025)

General

5 of 12 differ

Series

Pure Power 13 M2Retailer pagedirectcomputers.co.uk/products/be-quiet-pure-power-13-m-1200w-psu-80-plus-gold-exceptionally-quiet-120mm-fan-atx-3-1-10-year-warrantyRead 15 October 2026Listing title: be quiet! Pure Power 13 M 1200W. The spec table copies the maker's table, with model PURE POWER 13 M | 1200W.

RMx SHIFT1Maker product pagecorsair.com/us/en/p/psu/cp-9020299-na/rm850x-shift-fully-modular-atx-power-supply-cp-9020299-naRead 15 October 2026Product title: RM850x SHIFT. The maker calls the line RMx SHIFT. The page is the second generation (SKU CP-9020299-NA, model RPS0221), not the 2022 RM850x SHIFT (CP-9020252 and CP-9020274, model RPS0160).

Model numbersiMaker identifiers for this exact model and its listed variants. Excludes sibling models and other generations.

BP029US, BP029EU, BP029UK2Retailer pagedirectcomputers.co.uk/products/be-quiet-pure-power-13-m-1200w-psu-80-plus-gold-exceptionally-quiet-120mm-fan-atx-3-1-10-year-warrantyRead 15 October 2026UK listing, SKU BP029UK. BP029EU is the EU article number (AWD-IT, Paradigit, HWBusters). BP029US is the US article number (maker page title).

CP-9020299-NA, CP-9020299-EU, CP-9020299-UK1Maker product pagecorsair.com/us/en/p/psu/cp-9020299-na/rm850x-shift-fully-modular-atx-power-supply-cp-9020299-naRead 15 October 2026SKU CP-9020299-NA. The power table prints model RPS0221 and part no. 75-006527, which are not stored as model numbers.7Retailer pageamazon.com/dp/B0FPGD7XDKRead 15 October 2026Item details: Model Number CP-9020299-NA.8Retailer pagewebshop.netip.dk/corsair-rm850x-shift-80-gold/cat-p/c/p1006311000Read 15 October 2026SKU CP-9020299-EU.9Retailer pagescan.co.uk/products/850w-corsair-rm850x-shift-fully-modular-cybenetics-gold-pcie-51-single-rail-708a-140mm-fan-aRead 15 October 2026Scan lists CP-9020299-UK.

GTIN / EAN

4260052193655, 42600521937232Retailer pagedirectcomputers.co.uk/products/be-quiet-pure-power-13-m-1200w-psu-80-plus-gold-exceptionally-quiet-120mm-fan-atx-3-1-10-year-warrantyRead 15 October 2026Barcode 4260052193723 belongs to the UK model BP029UK.10Retailer pageawd-it.co.uk/be-quiet-pure-power-13-m-1200w-80-plus-gold-atx-3-1-power-supply-black-bp029eu.htmlRead 15 October 2026MPN BP029EU, EAN 4260052193655, the EU model.

840440484981, 840440484974, 8400066794487Retailer pageamazon.com/dp/B0FPGD7XDKRead 15 October 2026Item details: UPC 840440484981 and Mfr Part Number CP-9020299-NA. The check digit is valid.8Retailer pagewebshop.netip.dk/corsair-rm850x-shift-80-gold/cat-p/c/p1006311000Read 15 October 2026SKU CP-9020299-EU with EAN 0840440484974. Multitronic and DCS list the same code. Komputronik and Datafox also list 840006677284 for the same part number, which has a valid check digit too. The code that matches the US UPC prefix is stored.9Retailer pagescan.co.uk/products/850w-corsair-rm850x-shift-fully-modular-cybenetics-gold-pcie-51-single-rail-708a-140mm-fan-aRead 15 October 2026Scan lists manufacturer code CP-9020299-UK with GTIN 840006679448. The check digit is valid. This is the only source for the UK code.

AnnouncediThe maker's first announcement of this model. This is separate from first retail availability.

13 January 20263Press articlefunkykit.com/news/be-quiet-announces-power-zone-2-1200w-and-pure-power-13-m-1200w-psusRead 15 October 2026Article dated 13 January 2026. allround-pc.com reports the same announcement on 13 January 2026.

4 November 20253Press releasecorsair.com/newsroom/press-release/corsair-launches-second-generation-rmx-shift-psus-with-updated-cables-and-12v-2x6-gpu-supportRead 15 October 2026Press release dated November 4, 2025.

Status

Available9Retailer pageparadigit.ie/be-quiet-pure-power-13-m-1200-w/21872421/productRead 15 October 2026Listing in October 2026 shows the unit in stock with delivery in 4 to 5 working days. HWBusters published its review on September 23, 2026.

Available1Maker product pagecorsair.com/us/en/p/psu/cp-9020299-na/rm850x-shift-fully-modular-atx-power-supply-cp-9020299-naRead 15 October 2026Page shows In Stock, with a price of $139.99 against an original price of $169.99.

PredecessoriThe model this one directly replaced, in the same line, tier and size, as the maker or a trusted review names it.

Not available

Not available

SuccessoriThe model that directly replaced this one, in the same line, tier and size. A revision such as a Slim or OLED model does not count when a next generation exists.

Not available

Not available

Launch price (US)iThe maker's US launch MSRP for the stated configuration, excluding tax. Current store prices and later discounts do not qualify.

$229.93Press articlefunkykit.com/news/be-quiet-announces-power-zone-2-1200w-and-pure-power-13-m-1200w-psusRead 15 October 2026Article: recommended retail price of $229.90 / EUR 199.90. US price, no sales tax stated. KitGuru's review says an MSRP of roughly $200. The EUR figure is not stored because allround-pc.com, HWBusters and KitGuru give EUR 214.90 or about EUR 215.

Not available

Launch price (EU)iThe maker's euro launch price for the stated configuration, including VAT as published. Current store prices and later discounts do not qualify.

€214.94Press articleallround-pc.com/news/be-quiet-pure-power-13m-atx-3-1-netzteil-bekommt-neues-1200-watt-modellRead 15 October 2026German article dated 13 January 2026: the 1200 W model costs EUR 214.90. The page does not say whether VAT is included. German consumer prices include VAT. Funkykit prints EUR 199.90, the German price is stored.7Reviewhwbusters.com/psus/be-quiet-pure-power-13-m-1200w-atx-v3-1-psu-reviewRead 15 October 2026Technical specifications: MSRP EUR 214.90 (be quiet!). The review is dated September 23, 2026 and does not say whether the price includes VAT.

€169.94Maker product pageweb.archive.org/web/20251105034749/https://www.corsair.com/de/de/p/psu/cp-9020299-eu/rm850x-shift-fully-modular-atx-power-supply-eu-cp-9020299-euRead 15 October 2026Archived copy of the Corsair German page for CP-9020299-EU from 2025-11-05, the day after launch. It shows a price of 169,90 EUR with no discount, including VAT. The Spanish outlet Geektopia gives the same launch price of 169.90 EUR. No US dollar launch price is stored, because the archived Corsair US page shows $184.99 from November 2025 to January 2026 and $169.99 from February 2026, while Hardware Busters gives an MSRP of $170 excluding VAT.

MarketsiISO country or region codes where this exact model or variant is sold. A source page's language does not establish availability.

Not available

Not available

ColoursiThe maker's own colour names

Black2Retailer pagedirectcomputers.co.uk/products/be-quiet-pure-power-13-m-1200w-psu-80-plus-gold-exceptionally-quiet-120mm-fan-atx-3-1-10-year-warrantyRead 15 October 2026Spec table: Color Black.9Retailer pageparadigit.ie/be-quiet-pure-power-13-m-1200-w/21872421/productRead 15 October 2026Colour Black.

Black7Retailer pageamazon.com/dp/B0FPGD7XDKRead 15 October 2026Title: CORSAIR RM850x Shift (2025) Fully Modular ATX Power Supply, Black.

Form factoriThe physical size standard that decides what fits in the case. An ATX unit is 150 × 86 mm at the back. An SFX unit is 125 × 63.5 mm.

ATX6Measurementcybenetics.com/evaluations/psus/3127Read 15 October 2026DUT Information: Type ATX12V. The back face is 150 x 85 mm, the ATX size.

ATX1Maker product pagecorsair.com/us/en/p/psu/cp-9020299-na/rm850x-shift-fully-modular-atx-power-supply-cp-9020299-naRead 15 October 2026Tech Specs: Dimensions 160mm x 150mm x 86mm. The back face is 150 x 86 mm, the standard ATX size.

ATX versioniThe ATX12V design guide revision the maker claims compliance with. A 16-pin GPU cable alone does not establish ATX 3.x. A Cybenetics report that withholds its ATX badge does not change the maker's claim. It goes in the source note.

ATX 3.12Retailer pagedirectcomputers.co.uk/products/be-quiet-pure-power-13-m-1200w-psu-80-plus-gold-exceptionally-quiet-120mm-fan-atx-3-1-10-year-warrantyRead 15 October 2026Spec table: Form factor ATX 3.1, EPS 12V version 2.92.3Press articlefunkykit.com/news/be-quiet-announces-power-zone-2-1200w-and-pure-power-13-m-1200w-psusRead 15 October 2026Article: fully compliant with the ATX 3.1 standard.5Reviewkitguru.net/components/power-supplies/zardon/be-quiet-pure-power-13-m-1200w-review-2026Read 15 October 2026Introduction: ATX 3.1 and PCIe 5.1 compatible.7Reviewhwbusters.com/psus/be-quiet-pure-power-13-m-1200w-atx-v3-1-psu-reviewRead 15 October 2026Technical specifications: Compliance ATX 3.1, EPS 2.92, PCIe 5.1 ready.

ATX 3.11Maker product pagecorsair.com/us/en/p/psu/cp-9020299-na/rm850x-shift-fully-modular-atx-power-supply-cp-9020299-naRead 15 October 2026Overview: ATX 3.1-certified and PCIe 5.1 compliant. Tech Specs: ATX12V Version 3.1.3Press releasecorsair.com/newsroom/press-release/corsair-launches-second-generation-rmx-shift-psus-with-updated-cables-and-12v-2x6-gpu-supportRead 15 October 2026Meeting ATX 3.1 and PCIe 5.1 standards.

PCIe CEM versioniThe PCI Express card power revision the maker claims, as printed next to the ATX version. It sets the GPU power connector rules. It is not a slot speed. A reviewer's statement is not enough.

PCIe 5.12Retailer pagedirectcomputers.co.uk/products/be-quiet-pure-power-13-m-1200w-psu-80-plus-gold-exceptionally-quiet-120mm-fan-atx-3-1-10-year-warrantyRead 15 October 2026Description: ATX 3.1 compliant and PCIe 5.1 compatible, one PCIe 5.1 12V-2x6 600W connector.3Press articlefunkykit.com/news/be-quiet-announces-power-zone-2-1200w-and-pure-power-13-m-1200w-psusRead 15 October 2026Article: PCIe 5.1 ready, one 12V-2x6 connector for up to 600 W.5Reviewkitguru.net/components/power-supplies/zardon/be-quiet-pure-power-13-m-1200w-review-2026Read 15 October 2026Introduction: ATX 3.1 and PCIe 5.1 compatible.7Reviewhwbusters.com/psus/be-quiet-pure-power-13-m-1200w-atx-v3-1-psu-reviewRead 15 October 2026Technical specifications: Compliance ATX 3.1, EPS 2.92, PCIe 5.1 ready.

PCIe 5.11Maker product pagecorsair.com/us/en/p/psu/cp-9020299-na/rm850x-shift-fully-modular-atx-power-supply-cp-9020299-naRead 15 October 2026Overview: ATX 3.1-certified and PCIe 5.1 compliant.3Press releasecorsair.com/newsroom/press-release/corsair-launches-second-generation-rmx-shift-psus-with-updated-cables-and-12v-2x6-gpu-supportRead 15 October 2026Meeting ATX 3.1 and PCIe 5.1 standards.

Modular cablesiFull means every cable detaches. Semi means some cables are fixed, usually the 24-pin and CPU cables.

Fully modular3Press articlefunkykit.com/news/be-quiet-announces-power-zone-2-1200w-and-pure-power-13-m-1200w-psusRead 15 October 2026Article: fully modular.5Reviewkitguru.net/components/power-supplies/zardon/be-quiet-pure-power-13-m-1200w-review-2026Read 15 October 2026Introduction: fully modular.6Measurementcybenetics.com/evaluations/psus/3127Read 15 October 2026Manufacturer-provided information: Cable Design Fully Modular.

Fully modular1Maker product pagecorsair.com/us/en/p/psu/cp-9020299-na/rm850x-shift-fully-modular-atx-power-supply-cp-9020299-naRead 15 October 2026Overview: Fully modular with Type-5 connectors.3Press releasecorsair.com/newsroom/press-release/corsair-launches-second-generation-rmx-shift-psus-with-updated-cables-and-12v-2x6-gpu-supportRead 15 October 2026Fully modular, so builders can use only the cables they need.

Built by (OEM)iThe company that designed and built the unit for the brand, such as CWT or FSP. As named by the maker, a teardown review or a Cybenetics report.

Channel Well Technology (CWT)5Reviewkitguru.net/components/power-supplies/zardon/be-quiet-pure-power-13-m-1200w-review-2026Read 15 October 2026Internal page: a Channel Well Technology (CWT) OEM design.6Measurementcybenetics.com/evaluations/psus/3127Read 15 October 2026DUT Information and Parts Description: OEM/ODM Channel Well Technology, CWT.7Reviewhwbusters.com/psus/be-quiet-pure-power-13-m-1200w-atx-v3-1-psu-reviewRead 15 October 2026Technical specifications: Manufacturer (OEM) CWT. The smaller Pure Power 13 M models are built by FSP.

Great Wall5Measurementcybenetics.com/evaluations/psus/2879Read 15 October 2026DUT Information: OEM/ODM Great Wall. Parts description: Manufacturer (OEM) Great Wall.6Reviewhwbusters.com/psus/corsair-rm850x-shift-atx-v3-1-psu-reviewRead 15 October 2026Technical specifications: Manufacturer (OEM) Great Wall.

Power

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Rated continuous poweriThe continuous DC output the maker rates the unit for, such as 850. Peak or power excursion figures are not stored here.

1,200W6Measurementcybenetics.com/evaluations/psus/3127Read 15 October 2026Manufacturer-provided information: Rated Power 1200 W.

850W1Maker product pagecorsair.com/us/en/p/psu/cp-9020299-na/rm850x-shift-fully-modular-atx-power-supply-cp-9020299-naRead 15 October 2026Tech Specs: Continuous Power W 850 Watts and Total Power 850W.

Full power rated up toiThe ambient temperature up to which the maker rates full continuous power, such as 50 °C. A review table that prints 0-50 °C with no maker source is not enough. An operating temperature range that does not say full power is not enough. A maker table with load steps gives the full-load row, such as 40 °C at full load next to 50 °C at 80 percent load. A temperature that a Cybenetics report marks as manufacturer-provided counts as a maker statement.

Not available

Not available

12V rail designiHow the maker splits +12V over-current protection. Switchable means the user picks single or multi rail with a switch or in software.

Single rail2Retailer pagedirectcomputers.co.uk/products/be-quiet-pure-power-13-m-1200w-psu-80-plus-gold-exceptionally-quiet-120mm-fan-atx-3-1-10-year-warrantyRead 15 October 2026Spec table: One massive high-performance 12V rail, +12V1 100 A, +12V2 to +12V6 N/A.3Press articlefunkykit.com/news/be-quiet-announces-power-zone-2-1200w-and-pure-power-13-m-1200w-psusRead 15 October 2026Article: a single 12 V rail rated at 100 A.7Reviewhwbusters.com/psus/be-quiet-pure-power-13-m-1200w-atx-v3-1-psu-reviewRead 15 October 2026Technical specifications: Number of 12V rails 1.

Single rail5Measurementcybenetics.com/evaluations/psus/2879Read 15 October 2026Power Specifications: one +12V column with 70.8 A and 850 W.6Reviewhwbusters.com/psus/corsair-rm850x-shift-atx-v3-1-psu-reviewRead 15 October 2026Technical specifications: Number of 12V rails 1.

+12V max currentiHighest combined current on +12V from the maker's power table. For a multi-rail unit this is the combined total, not one rail.

100A2Retailer pagedirectcomputers.co.uk/products/be-quiet-pure-power-13-m-1200w-psu-80-plus-gold-exceptionally-quiet-120mm-fan-atx-3-1-10-year-warrantyRead 15 October 2026Spec table: +12V1 100 A.6Measurementcybenetics.com/evaluations/psus/3127Read 15 October 2026Power Specifications: +12V 100 A, 1200 W.

70.8A1Maker product pagecorsair.com/us/en/p/psu/cp-9020299-na/rm850x-shift-fully-modular-atx-power-supply-cp-9020299-naRead 15 October 2026Power table: +12V 70.8A, 850W.2Owner's manualcorsair.com/us/en/explorer/diy-builder/power-supply-units/corsair-rmx-shift-series-2nd-generationRead 15 October 2026RM850x power table, model RPS0221, part no. 75-006527: +12V 70.8A, 850W.5Measurementcybenetics.com/evaluations/psus/2879Read 15 October 2026Power Specifications table: +12V 70.8 A, 850 W.

+12V max poweriHighest combined power on +12V from the maker's power table.

1,200W2Retailer pagedirectcomputers.co.uk/products/be-quiet-pure-power-13-m-1200w-psu-80-plus-gold-exceptionally-quiet-120mm-fan-atx-3-1-10-year-warrantyRead 15 October 2026Spec table: Max. combined power 12V 1200 W.6Measurementcybenetics.com/evaluations/psus/3127Read 15 October 2026Power Specifications: +12V 1200 W.

850W1Maker product pagecorsair.com/us/en/p/psu/cp-9020299-na/rm850x-shift-fully-modular-atx-power-supply-cp-9020299-naRead 15 October 2026Power table: +12V 70.8A with 850W listed beside the row. The Cybenetics report also prints 850 W for +12V.2Owner's manualcorsair.com/us/en/explorer/diy-builder/power-supply-units/corsair-rmx-shift-series-2nd-generationRead 15 October 2026RM850x power table: +12V 70.8A, 850W.5Measurementcybenetics.com/evaluations/psus/2879Read 15 October 2026Power Specifications table: +12V 850 W.

+3.3V and +5V combined poweriThe combined limit for the +3.3V and +5V rails from the maker's power table. A table that prints the same figure under both rails, as be quiet! does, shows one shared limit, so the figure is stored once and not added.

120W2Retailer pagedirectcomputers.co.uk/products/be-quiet-pure-power-13-m-1200w-psu-80-plus-gold-exceptionally-quiet-120mm-fan-atx-3-1-10-year-warrantyRead 15 October 2026Spec table: +3.3V 22 A, +5V 22 A, max. combined power 3.3V + 5V 120 W.6Measurementcybenetics.com/evaluations/psus/3127Read 15 October 2026Power Specifications: 3.3V and 5V 22 A each, one 120 W cell for both rails, so 120 W is the combined limit.

120W1Maker product pagecorsair.com/us/en/p/psu/cp-9020299-na/rm850x-shift-fully-modular-atx-power-supply-cp-9020299-naRead 15 October 2026Power table: +3.3V 20A and +5V 20A with one 120W cell. The page layout does not tie the 120W to one rail. The Cybenetics report and Hardware Busters print it as the combined +3.3V and +5V power.2Owner's manualcorsair.com/us/en/explorer/diy-builder/power-supply-units/corsair-rmx-shift-series-2nd-generationRead 15 October 2026RM850x power table: +3.3V 20A, +5V 20A and one 120W cell.5Measurementcybenetics.com/evaluations/psus/2879Read 15 October 2026Power Specifications table: one merged 120 W cell for 3.3V and 5V, 20 A each.6Reviewhwbusters.com/psus/corsair-rm850x-shift-atx-v3-1-psu-reviewRead 15 October 2026Technical specifications: Power 5V + 3.3V 120W.

+5V standby currentiHighest current on the +5VSB standby rail. It powers USB charging and wake functions while the PC is off.

3A2Retailer pagedirectcomputers.co.uk/products/be-quiet-pure-power-13-m-1200w-psu-80-plus-gold-exceptionally-quiet-120mm-fan-atx-3-1-10-year-warrantyRead 15 October 2026Spec table: +5Vsb 3 A.6Measurementcybenetics.com/evaluations/psus/3127Read 15 October 2026Power Specifications: 5VSB 3 A, 15 W.

3A1Maker product pagecorsair.com/us/en/p/psu/cp-9020299-na/rm850x-shift-fully-modular-atx-power-supply-cp-9020299-naRead 15 October 2026Power table: +5VSB 3A, 15W.2Owner's manualcorsair.com/us/en/explorer/diy-builder/power-supply-units/corsair-rmx-shift-series-2nd-generationRead 15 October 2026RM850x power table: +5Vsb 3A, 15W.5Measurementcybenetics.com/evaluations/psus/2879Read 15 October 2026Power Specifications table: 5VSB 3 A, 15 W.

AC input voltageiThe rated AC input range, such as 100 to 240 V.

Lowest110Highest240V6Measurementcybenetics.com/evaluations/psus/3127Read 15 October 2026Manufacturer-provided information: rated voltage 110-240 Vrms, 7.5-15 A, 50-60 Hz. The unit label prints 110-240 Vac for non-EU markets and 200-240 Vac for the EU. The 80 PLUS certificate also rates 110-240 V. The maker's spec table on the Direct Computers listing prints 100-240 V. The label value is stored.

Lowest100Highest240V1Maker product pagecorsair.com/us/en/p/psu/cp-9020299-na/rm850x-shift-fully-modular-atx-power-supply-cp-9020299-naRead 15 October 2026Power table: AC input 100V-240V, input current 10A-5A, 47Hz-63Hz.2Owner's manualcorsair.com/us/en/explorer/diy-builder/power-supply-units/corsair-rmx-shift-series-2nd-generationRead 15 October 2026RM850x power table: AC input 100V-240V, input current 10A-5A, 47Hz-63Hz.5Measurementcybenetics.com/evaluations/psus/2879Read 15 October 2026Manufacturer-provided information: 100-240 Vrms, 5-10 A, 47-63 Hz.

Alternative low power mode (ALPM)iThe maker or a Cybenetics report states support for the ATX alternative low power mode used by Modern Standby.

Yes6Measurementcybenetics.com/evaluations/psus/3127Read 15 October 2026Temperature and Compliance Info: ALPM compatible, checked. The report also shows the ATX 3.1 badge and a passed ATX v3.1 power excursion test.

Yes1Maker product pagecorsair.com/us/en/p/psu/cp-9020299-na/rm850x-shift-fully-modular-atx-power-supply-cp-9020299-naRead 15 October 2026Tech Specs: Modern Standby Yes. The Cybenetics report ticks ALPM compatible.5Measurementcybenetics.com/evaluations/psus/2879Read 15 October 2026Temperature and Compliance Info: ALPM (Alternative Low Power Mode) compatible, checked. ATX v3.1 PSU Power Excursion is checked.6Reviewhwbusters.com/psus/corsair-rm850x-shift-atx-v3-1-psu-reviewRead 15 October 2026Technical specifications: Alternative Low Power Mode support Yes.

Certifications

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80 PLUS ratingiThe 80 PLUS level. When the 80 PLUS listing or certificate and the maker claim differ, store the listing level and put the claim and test voltage in the source note. When a model has several 80 PLUS entries, such as a newer test at a higher level, use the newest entry that matches the current maker documents.

80 PLUS Gold8Certification listclearesult.com/80plus/sites/80plus/files/manufacturer-certificate/BE%20QUIET_L13-M-1200W_1200W_SOCE%208025_Report.pdfRead 15 October 202680 PLUS ID 8025, model L13-M-1200W, type ATX 3.1: Gold at 115V, test date 2025-11-03. The sample serials 029EUL542000000x match the serial family of the Cybenetics sample 029EUL6070000044. The maker and the box claim 80 PLUS Gold.

Not available

Cybenetics efficiency at 115ViThe Cybenetics ETA level from the 115V test. The Cybenetics report wins over the maker's claim.

Cybenetics Platinum6Measurementcybenetics.com/evaluations/psus/3127Read 15 October 2026Report 26PS3127A, certification ID 263127, issued Jan 20, 2026. Sample serial 029EUL6070000044, the EU model. ETA Platinum badge at 115V. The maker and the box claim Cybenetics Gold. KitGuru reports that be quiet! confirmed the Platinum result and says the sample may have been an outlier.

Cybenetics Platinum5Measurementcybenetics.com/evaluations/psus/2879Read 15 October 2026Report 25PS2879, lab ID CR85002879, sample serial A9H1D518401FMC, received Jun 13, 2025, tested Jul 7, 2025, issued Jul 10, 2025. The model name is RM850x Shift (ATX v3.1). The Cybenetics database shows ETA Platinum at 115V. Corsair advertises Cybenetics Gold without a voltage, and Hardware Busters says Corsair used a lower badge on purpose. The report wins.

Cybenetics efficiency at 230ViThe Cybenetics ETA level from the 230V test. The 230V thresholds are higher, so the level can differ from the 115V level. The Cybenetics report wins over the maker's claim.

Cybenetics Platinum6Measurementcybenetics.com/evaluations/psus/3127Read 15 October 2026ETA Platinum badge at 230V.

Cybenetics Platinum5Measurementcybenetics.com/evaluations/psus/2879Read 15 October 2026The Cybenetics database shows ETA Platinum at 230V.

Cybenetics noise at 115ViThe Cybenetics LAMBDA level from the 115V test. A++ is the quietest. The Cybenetics report wins over the maker's claim.

A6Measurementcybenetics.com/evaluations/psus/3127Read 15 October 2026LAMBDA A badge at 115V.

A++5Measurementcybenetics.com/evaluations/psus/2879Read 15 October 2026LAMBDA A++ at 115V in the Cybenetics database. Corsair's page prints Cybenetics Noise A+, which the report does not support.

Cybenetics noise at 230ViThe Cybenetics LAMBDA level from the 230V test. The Cybenetics report wins over the maker's claim.

A6Measurementcybenetics.com/evaluations/psus/3127Read 15 October 2026LAMBDA A badge at 230V.

A++5Measurementcybenetics.com/evaluations/psus/2879Read 15 October 2026LAMBDA A++ at 230V in the Cybenetics database.

Measured

10 of 10 differ

Average efficiency at 115V (measured)iAverage efficiency over the whole load range at 115V input, from more than 1450 load combinations in the Cybenetics method. It is not the peak efficiency or the efficiency at 50% load.

89.708%6Measurementcybenetics.com/evaluations/psus/3127Read 15 October 2026Average over more than 1450 load combinations at 115V. Tested Jan 16, 2026, ambient 28-32 C. EU sample.

90.009%5Measurementcybenetics.com/evaluations/psus/2879Read 15 October 2026Average over more than 1450 load combinations at 115V, ambient 28-32 C. Hardware Busters prints 90.080% for 115V and 92.076% for 230V, which differ slightly from the report page.

Average efficiency at 230V (measured)iThe same average efficiency at 230V input.

91.903%6Measurementcybenetics.com/evaluations/psus/3127Read 15 October 2026Average over more than 1450 load combinations at 230V.

91.794%5Measurementcybenetics.com/evaluations/psus/2879Read 15 October 2026Average over more than 1450 load combinations at 230V.

Light-load efficiency at 115V (measured)iEfficiency at a 10 W load for units up to 500 W, or at a 2% load for larger units, at 115V input. This is the ATX light-load test.

75.474%6Measurementcybenetics.com/evaluations/psus/3127Read 15 October 2026Efficiency at 2% load at 115V. The unit is above 500 W, so the 2% load applies.

72.66%5Measurementcybenetics.com/evaluations/psus/2879Read 15 October 2026Efficiency at 2% load (more than 500 W unit) at 115V.

Average power factor at 115V (measured)iAverage power factor over the whole load range at 115V input. 1 is the best possible value.

0.9856Measurementcybenetics.com/evaluations/psus/3127Read 15 October 2026Average over more than 1450 load combinations at 115V. At 230V it is 0.955.

0.9925Measurementcybenetics.com/evaluations/psus/2879Read 15 October 2026Average over more than 1450 load combinations at 115V. At 230V it is 0.966.

Average noise at 115V (measured)iAverage noise over the whole load range at 115V input in the Cybenetics method, at about 30 °C ambient. It is not the noise at full load.

21.03dB(A)6Measurementcybenetics.com/evaluations/psus/3127Read 15 October 2026Average over more than 1450 load combinations at 115V, ambient 28-32 C, Bruel and Kjaer 2270 G4 sound analyzer. The 230V average is 22.69 dBA.

10.65dB(A)5Measurementcybenetics.com/evaluations/psus/2879Read 15 October 2026Average over more than 1450 load combinations at 115V, ambient 28-32 C, Bruel and Kjaer 2270 G4 sound analyzer. The 230V average is 10.97 dBA. The fan stays at 0 rpm up to 50% load.

Noise at full load at 115V (measured)iNoise at 100% load at 115V input in the Cybenetics typical load tests. That row often runs at about 45 °C intake. The intake temperature and the fan speed go in the source note. Lower is better.

43.7dB(A)6Measurementcybenetics.com/evaluations/psus/3127Read 15 October 2026Typical load tests at 115V, 100% load row: 43.7 dB(A) at 2166 rpm fan speed, intake 45.14 C and exhaust 49.83 C.

32.8dB(A)5Measurementcybenetics.com/evaluations/psus/2879Read 15 October 2026Typical load tests at 115V, 100% load row: 32.8 dB(A) at 1064 rpm fan speed, ambient about 30 C. At 230V it is 32.2 dB(A) at 1037 rpm.

Standby power with no load at 115V (measured)iPower the unit draws from the wall with the PC off and nothing drawn from +5VSB, at 115V input.

0.023W6Measurementcybenetics.com/evaluations/psus/3127Read 15 October 2026Standby power consumption at 115V with no load on +5VSB: 0.0230 W. At 230V it is 0.1111 W.

0.0405W5Measurementcybenetics.com/evaluations/psus/2879Read 15 October 2026Standby power consumption at 115V with no load on +5VSB: 0.0405 W. At 230V it is 0.0818 W.

Hold-up time (measured)iHow long the outputs stay in regulation after AC power is lost, at maximum continuous load, as printed in the Cybenetics report. The report names no input voltage. The AC loss to PWR_OK time goes in the source note. Higher is better.

19.8ms6Measurementcybenetics.com/evaluations/psus/3127Read 15 October 2026Hold-Up Time and PWR_OK Signal: hold-up time 19.8 ms, AC loss to PWR_OK 16.8 ms, at maximum continuous load. The maker's own figure is 19.11 ms at 100% load.

24.5ms5Measurementcybenetics.com/evaluations/psus/2879Read 15 October 2026Hold-Up Time and PWR_OK Signal: hold-up time 24.50 ms, AC loss to PWR_OK 19.70 ms, PWR_OK inactive to DC loss 4.80 ms, at maximum continuous load. The report names no input voltage.

12V ripple at full load (measured)iPeak-to-peak ripple on the +12V rail at full load and 115V input. Lower is better.

32.81mV6Measurementcybenetics.com/evaluations/psus/3127Read 15 October 2026Non-accredited. 12V ripple at full load at 115V. At 230V it is 32.61 mV.

20.97mV5Measurementcybenetics.com/evaluations/psus/2879Read 15 October 2026Non-accredited. 12V ripple at full load at 115V. At 230V it is 22.45 mV.

12V load regulation (measured)iHow far the +12V voltage moves between light and full load at 115V input. Lower is better.

1.04%6Measurementcybenetics.com/evaluations/psus/3127Read 15 October 2026Non-accredited. 12V load regulation at 115V. At 230V it is 1.02%.

0.57%5Measurementcybenetics.com/evaluations/psus/2879Read 15 October 2026Non-accredited. 12V load regulation at 115V. At 230V it is 0.57%.

Cables and connectors

4 of 7 differ

CablesiOne row per kind of cable that runs from the PSU to a device. Connector is the plug at the device end. Count is the number of those plugs over all cables in the row. Length runs from the PSU end to the first plug. Adapters that plug into other cables are left out. Use 16-pin PCIe when the maker names a 16-pin GPU cable without saying 12V-2x6 or 12VHPWR. A cable from a 12V-2x6 socket on the PSU to 8-pin plugs is a cable, not an adapter, and counts as PCIe 8-pin. When the maker's documents name one GPU cable both 12VHPWR and 12V-2x6, use 16-pin PCIe and name both in the source note. Cables of one connector kind with different lengths or wire gauges get one row each.

Abe quiet! Pure Power 13 M 1200W

Connector	Connectors	Cables	Length to first plug (mm)	Wire gauge	Rated power (W)
ATX 24-pin (20+4)	1	1	550	16-18AWG	Not available
CPU 8-pin (EPS, 4+4)	2	2	650	16AWG	Not available
PCIe 8-pin (6+2)	2	1	600	16AWG	Not available
PCIe 8-pin (6+2)	2	1	500	16AWG	Not available
12V-2x6	1	1	600	16AWG	600
SATA power	6	2	500	18AWG	Not available
4-pin Molex	2	1	500	18AWG	Not available

Source6Measurementcybenetics.com/evaluations/psus/3127Read 15 October 2026Cables and Connectors table: ATX 20+4 pin 550 mm 16-18AWG, 4+4 pin EPS and 8 pin EPS 650 mm 16AWG, 6+2 pin PCIe 600 mm and 500 mm + 150 mm with 16AWG, 12+4 pin PCIe 600 mm (600W) 16-24AWG, SATA 500 mm + 3 x 150 mm (4 plugs) and SATA 500 mm + 150 mm with two Molex plugs after it 18AWG. The 16-24AWG range of the 12V-2x6 cable includes the thin sideband wires, so the stored gauge is the 16AWG power wire. The report counts the two 600 mm PCIe plugs as two cables. HWBusters, the unit's two PCIe sockets and the maker's total of 8 cables give one cable with two plugs, so the stored cable_count is 1.7Reviewhwbusters.com/psus/be-quiet-pure-power-13-m-1200w-atx-v3-1-psu-reviewRead 15 October 2026Cables page: 20+4 pin ATX 550 mm, 4+4 pin and 8 pin EPS 650 mm, one PCIe cable with two 6+2 pin plugs at 600 mm, one with 500 mm + 150 mm, 12V-2x6 600 mm, SATA cables 500 mm + 3 x 150 mm and 500 mm + 150 mm with two Molex plugs. The modular panel has two PCIe sockets. Lengths and gauge match the Cybenetics report.

BCORSAIR RM850x SHIFT (2025)

Connector	Connectors	Cables	Length to first plug (mm)	Wire gauge	Rated power (W)
ATX 24-pin (20+4)	1	1	610	16-20AWG	Not available
CPU 8-pin (EPS, 4+4)	2	2	650	18AWG	Not available
PCIe 8-pin (6+2)	4	3	650	18AWG	Not available
12V-2x6	1	1	650	Not available	600
SATA power	9	3	500	18AWG	Not available
4-pin Molex	4	1	450	18AWG	Not available

Source1Maker product pagecorsair.com/us/en/p/psu/cp-9020299-na/rm850x-shift-fully-modular-atx-power-supply-cp-9020299-naRead 15 October 2026Cable listing: 1 ATX 24-pin 610 mm, 2 EPS 4+4-pin 650 mm, 2 PCIe 8-pin (6+2-pin) 650 mm, 1 90-degree 12V-2x6 to 600W 12V-2x6 (12+4-pin) 650 mm, 1 600W 90-degree 12V-2x6 to 2x 8-pin PCIe (6+2-pin) cable with 2 plugs 650 mm, 3 SATA cables with 3 plugs each (500 mm to the first plug, 100 mm spacing, 700 mm total) and 1 PATA cable with 4 plugs (450 mm to the first plug, 100 mm spacing, 750 mm total). All lengths have a tolerance of 10 mm. PATA plugs are the 4-pin Molex plugs. The 12V-2x6 to 2x 8-pin cable is stored as a PCIe 8-pin cable with 2 plugs. It and the 12V-2x6 cable both plug into the native 12V-2x6 socket of the PSU, as Hardware Busters says the modular panel has one native 12V-2x6 header. The Cybenetics report and Hardware Busters list the 2x 8-pin cable as 2 cables with 2 connectors, which does not match Corsair's listing. Gauges come from the Cybenetics report.2Owner's manualcorsair.com/us/en/explorer/diy-builder/power-supply-units/corsair-rmx-shift-series-2nd-generationRead 15 October 2026Included cables for the RM850x, with the SATA count stated for the 850W: 1x ATX 24-pin 610 mm, 2x EPS 4+4-pin 650 mm, 2x PCIe 8-pin 650 mm, 1x 90-degree 12V-2x6 to 2x 8-pin PCIe 650 mm, 1x 90-degree 12V-2x6 to 600W 12V-2x6 650 mm, 3x SATA, 1x PATA.5Measurementcybenetics.com/evaluations/psus/2879Read 15 October 2026Cables and Connectors table: ATX 24 pin 610 mm 16-20AWG, 2 x 4+4 pin ATX12V 650 mm 18AWG, 2 x 6+2 pin PCIe 650 mm 18AWG, 2 x 2x 6+2 pin PCIe 650 mm 18AWG, 12+2 pin PCIe 650 mm (600W) 16-24AWG, 3 SATA cables with 9 plugs in total 18AWG and 1 Molex cable with 4 plugs 18AWG, no in-cable capacitors. The 16-24AWG range of the 12V-2x6 cable includes the sideband wires, so no gauge is stored for it. The 18AWG gauge of the PCIe cables is stored for the 2x 8-pin cable too.6Reviewhwbusters.com/psus/corsair-rm850x-shift-atx-v3-1-psu-reviewRead 15 October 2026Cables page: the modular panel has eleven sockets including one native 12V-2x6 header, and all cables are debossed PVC. Review date November 16, 2025.

CPU (EPS) connectorsi8-pin or 4+4-pin CPU power plugs.

2=CalculatedFrom Cables

2=CalculatedFrom Cables

PCIe 8-pin connectorsi8-pin or 6+2-pin GPU power plugs. Counts the plugs in the box. Some cables share one PSU socket, which the source note says.

4=CalculatedFrom Cables

4=CalculatedFrom Cables

16-pin GPU connectorsiNative 16-pin GPU power plugs: 12V-2x6, 12VHPWR and 16-pin cables of unstated revision. Adapters are not counted. Counts the plugs in the box. Some cables share one PSU socket, which the source note says.

1=CalculatedFrom Cables

1=CalculatedFrom Cables

SATA power connectors

6=CalculatedFrom Cables

9=CalculatedFrom Cables

4-pin Molex connectors

2=CalculatedFrom Cables

4=CalculatedFrom Cables

Cable styleiHow the modular cables are made. Mixed means some cables are sleeved and others flat, such as a sleeved 24-pin cable with flat other cables. From the maker page or a review photo page.

Mixed2Retailer pagedirectcomputers.co.uk/products/be-quiet-pure-power-13-m-1200w-psu-80-plus-gold-exceptionally-quiet-120mm-fan-atx-3-1-10-year-warrantyRead 15 October 2026Spec table: Sleeved cables Yes, Flat cables Yes. HWBusters says the ATX and 12V-2x6 cables are sleeved and the rest are flat ribbon.7Reviewhwbusters.com/psus/be-quiet-pure-power-13-m-1200w-atx-v3-1-psu-reviewRead 15 October 2026Technical specifications: sleeved ATX and 12V-2x6 cables, flat ribbon cables for the rest.

Embossed or debossed flat1Maker product pagecorsair.com/us/en/p/psu/cp-9020299-na/rm850x-shift-fully-modular-atx-power-supply-cp-9020299-naRead 15 October 2026Cable listing: Debossed cable type for every cable. Tech Specs: Cable Type Type 5. Stored as embossed, which covers debossed jackets.3Press releasecorsair.com/newsroom/press-release/corsair-launches-second-generation-rmx-shift-psus-with-updated-cables-and-12v-2x6-gpu-supportRead 15 October 2026Improved debossed-PVC cables with low-profile combs.

Fan

2 of 4 differ

Fan sizeiFrame size of the cooling fan, such as 120, 135 or 140.

120mm2Retailer pagedirectcomputers.co.uk/products/be-quiet-pure-power-13-m-1200w-psu-80-plus-gold-exceptionally-quiet-120mm-fan-atx-3-1-10-year-warrantyRead 15 October 2026Spec table: Fan size 120 mm.5Reviewkitguru.net/components/power-supplies/zardon/be-quiet-pure-power-13-m-1200w-review-2026Read 15 October 2026Internal page: 120 mm fan BQ QF2 12025 HS, 12 V, 0.37 A, up to 2,700 rpm.6Measurementcybenetics.com/evaluations/psus/3127Read 15 October 2026DUT Information: 120 mm fan BQ QF2-12025-HS.

140mm1Maker product pagecorsair.com/us/en/p/psu/cp-9020299-na/rm850x-shift-fully-modular-atx-power-supply-cp-9020299-naRead 15 October 2026Tech Specs: Fan Size MM 140mm.3Press releasecorsair.com/newsroom/press-release/corsair-launches-second-generation-rmx-shift-psus-with-updated-cables-and-12v-2x6-gpu-supportRead 15 October 2026A quiet 140mm fluid dynamic bearing fan.5Measurementcybenetics.com/evaluations/psus/2879Read 15 October 2026DUT Information: 140mm Fluid Dynamic Bearing Fan (NR140HP).

Fan bearingiUse the maker's bearing name. FDB and S-FDB are fluid dynamic. HDB is hydrodynamic. Noctua SSO and SSO2 are SSO. Corsair Magnetic Dome is magnetic dome. A brand bearing name that fits no option is Other.

Rifle2Retailer pagedirectcomputers.co.uk/products/be-quiet-pure-power-13-m-1200w-psu-80-plus-gold-exceptionally-quiet-120mm-fan-atx-3-1-10-year-warrantyRead 15 October 2026Spec table: Bearing technology Rifle.5Reviewkitguru.net/components/power-supplies/zardon/be-quiet-pure-power-13-m-1200w-review-2026Read 15 October 2026Internal page: a rifle bearing unit, not fluid dynamic.6Measurementcybenetics.com/evaluations/psus/3127Read 15 October 2026DUT Information: rifle bearing fan.7Reviewhwbusters.com/psus/be-quiet-pure-power-13-m-1200w-atx-v3-1-psu-reviewRead 15 October 2026Part analysis: be quiet! BQ QF2-12025-HS, 120 mm, rifle bearing.

Fluid dynamic (FDB)1Maker product pagecorsair.com/us/en/p/psu/cp-9020299-na/rm850x-shift-fully-modular-atx-power-supply-cp-9020299-naRead 15 October 2026Tech Specs: Fan Bearing Technology FDB. Overview: 140mm Fluid Dynamic Bearing fan.3Press releasecorsair.com/newsroom/press-release/corsair-launches-second-generation-rmx-shift-psus-with-updated-cables-and-12v-2x6-gpu-supportRead 15 October 2026A quiet 140mm fluid dynamic bearing fan.5Measurementcybenetics.com/evaluations/psus/2879Read 15 October 2026Parts description: Corsair NR140HP, 140mm, 12V, 0.33A, Fluid Dynamic Bearing Fan.

Fan modeiSemi-passive means the fan stops at low load, often sold as zero RPM, hybrid or 0 dB mode. Fanless means the unit has no fan.

Semi-passive2Retailer pagedirectcomputers.co.uk/products/be-quiet-pure-power-13-m-1200w-psu-80-plus-gold-exceptionally-quiet-120mm-fan-atx-3-1-10-year-warrantyRead 15 October 2026Description: semi-passive construction. Max. fan speed 2700 rpm.5Reviewkitguru.net/components/power-supplies/zardon/be-quiet-pure-power-13-m-1200w-review-2026Read 15 October 2026External page: a semi-passive zero RPM cooling system.6Measurementcybenetics.com/evaluations/psus/3127Read 15 October 2026DUT Information: Semi-Passive Operation checked.

Semi-passive1Maker product pagecorsair.com/us/en/p/psu/cp-9020299-na/rm850x-shift-fully-modular-atx-power-supply-cp-9020299-naRead 15 October 2026Overview: Zero RPM Mode for near-silent operation at lower loads.3Press releasecorsair.com/newsroom/press-release/corsair-launches-second-generation-rmx-shift-psus-with-updated-cables-and-12v-2x6-gpu-supportRead 15 October 2026Zero RPM mode: the fan switches off entirely at low and medium loads. A rear-mounted knob adjusts fan speed.5Measurementcybenetics.com/evaluations/psus/2879Read 15 October 2026DUT Information: Semi-Passive Operation checked (selectable). The typical load table shows the fan at 0 rpm from 10% to 50% load.6Reviewhwbusters.com/psus/corsair-rm850x-shift-atx-v3-1-psu-reviewRead 15 October 2026Technical specifications: Semi-Passive Operation yes (selectable). Corsair's guide says the fan speed knob sets the speed once the fan starts and does not turn Zero RPM mode off, so no fan mode switch is stored.

Fan mode switchiA button, switch or software setting lets the user turn the semi-passive mode off so the fan always spins. A unit without a semi-passive mode, whose fan the maker says always spins, has no switch, so it is false.

Not available

Not available

Protection and parts

1 of 3 differ

ProtectionsiProtections the maker lists, or a retailer spec table copies from the maker, plus protections the Cybenetics protection tests show working (UVP, NLO, SIP). The Cybenetics manufacturer list has no OVP or UVP row, so do not build the list from it alone. A protection that is not listed may still exist. No-load covers no-load operation and no-load protection. Fan failure is a maker's fan failure protection or fan safeguard, also when the Cybenetics manufacturer block lists it.

Over-current (OCP), Over-voltage (OVP), Under-voltage (UVP), Over-power (OPP), Over-temperature (OTP), Short-circuit (SCP), No-load (NLO), Surge and inrush (SIP)2Retailer pagedirectcomputers.co.uk/products/be-quiet-pure-power-13-m-1200w-psu-80-plus-gold-exceptionally-quiet-120mm-fan-atx-3-1-10-year-warrantyRead 15 October 2026Spec table: OTP, OCP, OPP, SCP, OVP, UVP and SIP (surge and inrush) all Yes. NLO is added from the Cybenetics protection tests.6Measurementcybenetics.com/evaluations/psus/3127Read 15 October 2026Protection Features (Manufacturer) lists OPP, +12V OCP, SCP, surge and inrush protection, with OTP and fan failure protection unticked. The protection tests show OTP working at 134 C, UVP at 90 V and 80 V, SCP on all rails and NLO. Fan failure protection is missing. The maker's spec table adds OVP.9Retailer pageparadigit.ie/be-quiet-pure-power-13-m-1200-w/21872421/productRead 15 October 2026Protection: over current, over power, over voltage, overheating, short circuit, surge and inrush, under voltage.

Over-current (OCP), Over-voltage (OVP), Under-voltage (UVP), Over-power (OPP), Over-temperature (OTP), Short-circuit (SCP), No-load (NLO), Surge and inrush (SIP)2Owner's manualcorsair.com/us/en/explorer/diy-builder/power-supply-units/corsair-rmx-shift-series-2nd-generationRead 15 October 2026Protection section for the series: OVP on 12V, 5V and 3.3V, OCP on 3.3V, 5V and 12V, OTP, SCP and OPP. UVP, NLO and SIP come from the Hardware Busters protection tests.5Measurementcybenetics.com/evaluations/psus/2879Read 15 October 2026Protection Features (Manufacturer): OPP, +12V OCP, OTP, SCP, surge protection and inrush protection ticked, fan failure protection not present.6Reviewhwbusters.com/psus/corsair-rm850x-shift-atx-v3-1-psu-reviewRead 15 October 2026Protection Features page: OCP on 12V, 5V, 3.3V and 5VSB, OPP, OTP, SCP, UVP (90V full load and 80V no damage), NLO and SIP (surge MOV, inrush NTC and bypass relay) all shown. Fan failure protection is not present.

All-Japanese capacitorsiThe maker states that every electrolytic capacitor is from a Japanese maker. A Japanese bulk capacitor alone is not enough. A spec row such as "Japanese capacitors" that names no exception counts.

Not available

Yes1Maker product pagecorsair.com/us/en/p/psu/cp-9020299-na/rm850x-shift-fully-modular-atx-power-supply-cp-9020299-naRead 15 October 2026Overview: 105 C-rated, 100% Japanese electrolytic capacitors. The Cybenetics parts list also shows polymer capacitors from FPCAP, which the claim does not cover.3Press releasecorsair.com/newsroom/press-release/corsair-launches-second-generation-rmx-shift-psus-with-updated-cables-and-12v-2x6-gpu-supportRead 15 October 2026105 C-rated 100% Japanese capacitors.

MTBF (claimed)iThe maker's mean time between failures, such as 100000. An MTTF figure for the whole unit counts too. An MTTF for the fan alone does not. The test temperature goes in the source note.

100,000h2Retailer pagedirectcomputers.co.uk/products/be-quiet-pure-power-13-m-1200w-psu-80-plus-gold-exceptionally-quiet-120mm-fan-atx-3-1-10-year-warrantyRead 15 October 2026Spec table: Average life time (h / 25 C) greater than 100,000. Stored as 100000.9Retailer pageparadigit.ie/be-quiet-pure-power-13-m-1200-w/21872421/productRead 15 October 2026MTBF 100,000 hours. The maker's table copy says greater than 100,000 hours at 25 C.

100,000h1Maker product pagecorsair.com/us/en/p/psu/cp-9020299-na/rm850x-shift-fully-modular-atx-power-supply-cp-9020299-naRead 15 October 2026Tech Specs: MTBF Hours 100,000 hours. The test temperature is not stated.

Monitoring and lighting

None of 4 known

Software monitoringiThe unit reports power, temperature or fan data to PC software over a USB or internal connection.

Not available

Not available

SoftwareiThe maker's software for monitoring or control.

Not available

Not available

Built-in power displayiA screen on the unit that shows live power draw or other readings.

Not available

Not available

RGB lighting

Not available

Not available

Dimensions and weight

1 of 2 differ

DimensionsiBody without cables. Width and height are the back face with the AC inlet. Depth is the length into the case, which decides case fit.

Width150Height86Depth160mm(5.9 × 3.4 × 6.3 in)2Retailer pagedirectcomputers.co.uk/products/be-quiet-pure-power-13-m-1200w-psu-80-plus-gold-exceptionally-quiet-120mm-fan-atx-3-1-10-year-warrantyRead 15 October 2026Spec table: Dimensions without cable (L x W x H) 160 x 150 x 86 mm, so depth 160, width 150, height 86.5Reviewkitguru.net/components/power-supplies/zardon/be-quiet-pure-power-13-m-1200w-review-2026Read 15 October 2026External page: 160 x 150 x 86 mm.7Reviewhwbusters.com/psus/be-quiet-pure-power-13-m-1200w-atx-v3-1-psu-reviewRead 15 October 2026Technical specifications: 150 x 85 x 160 mm (W x H x D). The maker's table and retailers give 86 mm, which matches the ATX size.

Width150Height86Depth160mm(5.9 × 3.4 × 6.3 in)1Maker product pagecorsair.com/us/en/p/psu/cp-9020299-na/rm850x-shift-fully-modular-atx-power-supply-cp-9020299-naRead 15 October 2026Tech Specs: Dimensions 160mm x 150mm x 86mm with no axis names. The quick start guide gives length 160 mm, width 150 mm and height 86 mm. Depth is 160 mm.2Owner's manualcorsair.com/us/en/explorer/diy-builder/power-supply-units/corsair-rmx-shift-series-2nd-generationRead 15 October 2026RM850x specifications: 160mm length, 150mm width, 86mm height.

WeightiWeight of the unit alone. Use the Hardware Busters figure on hwbusters.com when the maker states none, not a copy on another site. Maker weights that include cables or the box, such as Corsair's, and retailer packed weights are not stored. A net weight counts unless the maker says it includes the cables.

1.8kg(4 lb)7Reviewhwbusters.com/psus/be-quiet-pure-power-13-m-1200w-atx-v3-1-psu-reviewRead 15 October 2026Technical specifications: 1.80 kg (3.97 lb), also in the text of the Box page. The review does not say whether cables are included. The maker's spec table copy on the Direct Computers and Paradigit listings prints 2.69 kg, which is 0.89 kg more than the measured unit and is not stored.

1.6kg(3.5 lb)6Reviewhwbusters.com/psus/corsair-rm850x-shift-atx-v3-1-psu-reviewRead 15 October 2026Technical specifications: 1.60 kg (3.53 lb). Corsair's page prints 2kg and its US shop page showed 2.89kg in November 2025, which are packed weights and are not stored.

In the box

1 of 1 differ

In the boxiItems supplied with this exact model, verbatim. The AC power cord differs per region.

AC power cord, Mounting screws, Cable ties, User manual2Retailer pagedirectcomputers.co.uk/products/be-quiet-pure-power-13-m-1200w-psu-80-plus-gold-exceptionally-quiet-120mm-fan-atx-3-1-10-year-warrantyRead 15 October 2026Spec table scope of delivery: screws Yes, cable ties Yes, user manual. The AC power cord is named by HWBusters and KitGuru. The cord differs per region.5Reviewkitguru.net/components/power-supplies/zardon/be-quiet-pure-power-13-m-1200w-review-2026Read 15 October 2026Bundle page: a little user manual, cable ties, mounting screws and a power cable.7Reviewhwbusters.com/psus/be-quiet-pure-power-13-m-1200w-atx-v3-1-psu-reviewRead 15 October 2026Box and bundle page: modular cables, AC power cord, mounting screws, cable ties and one user manual for all six Pure Power 13 M models.

Not available

Links

Not compared

Product page

www.bequiet.com/en/powersupply/60271Maker product pagebequiet.com/en/powersupply/6027Read 15 October 2026Maker page for BP029US, taken from a search result title. The agent did not open the page, so no other value is taken from it.

www.corsair.com/us/en/p/psu/cp-9020299-na/rm850x-shift-fully-modular-atx-power-supply-cp-9020299-na1Maker product pagecorsair.com/us/en/p/psu/cp-9020299-na/rm850x-shift-fully-modular-atx-power-supply-cp-9020299-naRead 15 October 2026

Spec sheet

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Manual

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www.corsair.com/us/en/explorer/diy-builder/power-supply-units/corsair-rmx-shift-series-2nd-generation2Owner's manualcorsair.com/us/en/explorer/diy-builder/power-supply-units/corsair-rmx-shift-series-2nd-generationRead 15 October 2026Quick start guide of the RMx SHIFT Series 2nd generation. It covers the 750W, 850W and 1000W models. The page also keeps no separate PDF.

EPREL registration numberiId in the EU energy label database. Each size or model of a series has its own id, so it is per variant.

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Warranty

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Manufacturer warranty (source market)iThe maker's warranty period for the exact SKU or configuration and market named in the source note. It applies only to that stated market, not every regional variant. Statutory consumer rights are excluded. The base term is stored. An extension that needs registration goes in the source note.

10years2Retailer pagedirectcomputers.co.uk/products/be-quiet-pure-power-13-m-1200w-psu-80-plus-gold-exceptionally-quiet-120mm-fan-atx-3-1-10-year-warrantyRead 15 October 2026Spec table: Warranty (Years) 10. The listing names no market.3Press articlefunkykit.com/news/be-quiet-announces-power-zone-2-1200w-and-pure-power-13-m-1200w-psusRead 15 October 2026Article: 10-year manufacturer's warranty.5Reviewkitguru.net/components/power-supplies/zardon/be-quiet-pure-power-13-m-1200w-review-2026Read 15 October 2026Introduction: 10-year warranty.6Measurementcybenetics.com/evaluations/psus/3127Read 15 October 2026Manufacturer-provided information: Warranty 10 years.

10years1Maker product pagecorsair.com/us/en/p/psu/cp-9020299-na/rm850x-shift-fully-modular-atx-power-supply-cp-9020299-naRead 15 October 2026Tech Specs: Warranty 10 Year and the Overview says 10-year warranty. The page is the US shop.2Owner's manualcorsair.com/us/en/explorer/diy-builder/power-supply-units/corsair-rmx-shift-series-2nd-generationRead 15 October 2026CORSAIR RMx SHIFT Series 2nd Gen PSUs have a 10-year warranty.3Press releasecorsair.com/newsroom/press-release/corsair-launches-second-generation-rmx-shift-psus-with-updated-cables-and-12v-2x6-gpu-supportRead 15 October 2026Each unit includes a ten-year warranty.

Both are also in the API. Back to all power supplies.