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be quiet! Dark Power 14 1000W vs CORSAIR RM850x SHIFT (2025)

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Dark Power 14 1000W

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Product B: CORSAIR

RM850x SHIFT (2025)

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Abe quiet! Dark Power 14 1000W

BCORSAIR RM850x SHIFT (2025)

General

5 of 12 differ

Series

Dark Power 149Retailer pagescan.co.uk/products/1000w-be-quiet!-dark-power-14-fully-modular-pcie-51-80plus-titanium-quad-rail-833a-135mm-fan-atx-31Read 15 October 2026Listing title: be quiet! Dark Power 14 1000 Watt. The maker and the Cybenetics report name the line Dark Power 14.

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.

BP020US, BP020EU8Retailer pageavadirect.com/DARK-POWER-14-80-PLUS-Titanium-1000W-Fully-Modular-ATX-Power-Supply/Product/19681238Read 15 October 2026AvaDirect (US) lists MPN and article number BP020US. It lists EAN 4260052192023, the same EAN Scan gives for BP020EU, so the EAN is stored on the EU model only.9Retailer pagescan.co.uk/products/1000w-be-quiet!-dark-power-14-fully-modular-pcie-51-80plus-titanium-quad-rail-833a-135mm-fan-atx-31Read 15 October 2026Scan UK lists the model number BP020EU (Scan code LN165194).

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

42600521920239Retailer pagescan.co.uk/products/1000w-be-quiet!-dark-power-14-fully-modular-pcie-51-80plus-titanium-quad-rail-833a-135mm-fan-atx-31Read 15 October 2026GTIN/EAN 4260052192023 for BP020EU. Caseking lists another EAN, 4260052192054, for MPN BP020EU. Two retailers agree on 4260052192023.

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.

October 20253Press articleguru3d.com/story/be-quiet-announces-dark-power-14-power-supply-seriesRead 15 October 2026Guru3D copy of the be quiet! press release, published 2025-10-14. The Dark Power 14 series has 850 W, 1000 W and 1200 W models.4Press articlefunkykit.com/news/be-quiet-announces-dark-power-14-power-supply-seriesRead 15 October 2026Copy of the press release dated 2025-10-14 (Eddie Chim).

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

Available8Retailer pageavadirect.com/DARK-POWER-14-80-PLUS-Titanium-1000W-Fully-Modular-ATX-Power-Supply/Product/19681238Read 15 October 2026US listing is live in October 2026 with low stock.9Retailer pagescan.co.uk/products/1000w-be-quiet!-dark-power-14-fully-modular-pcie-51-80plus-titanium-quad-rail-833a-135mm-fan-atx-31Read 15 October 2026UK listing is live in October 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.

$274.93Press articleguru3d.com/story/be-quiet-announces-dark-power-14-power-supply-seriesRead 15 October 2026Suggested retail price $274.90 for the 1000 W model. The release does not say whether tax is included, and US prices are normally quoted without sales tax.6Reviewclub386.com/be-quiet-dark-power-14-reviewRead 15 October 2026Price $274.90 / 274.90 EUR in the review's specification table.

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.

€274.93Press articleguru3d.com/story/be-quiet-announces-dark-power-14-power-supply-seriesRead 15 October 2026Suggested retail price 274.90 EUR for the 1000 W model, as published. The release does not say whether VAT is included. HW Busters labels its $275/275 EUR MSRP as excluding VAT. Street prices in the EU are 264 to 280 EUR including VAT.6Reviewclub386.com/be-quiet-dark-power-14-reviewRead 15 October 2026Price $274.90 / 274.90 EUR in the review's specification table.

€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

Black8Retailer pageavadirect.com/DARK-POWER-14-80-PLUS-Titanium-1000W-Fully-Modular-ATX-Power-Supply/Product/19681238Read 15 October 2026Color Black.10Retailer pageldlc.pro/fiche/PB00712442.htmlRead 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.

ATX1Measurementcybenetics.com/evaluations/psus/2953Read 15 October 2026DUT Information: Type ATX12V. The unit is 150 mm wide and 86 mm high, 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 3.13Press articleguru3d.com/story/be-quiet-announces-dark-power-14-power-supply-seriesRead 15 October 2026Series is ATX 3.1 compliant (see also the Funkykit copy).4Press articlefunkykit.com/news/be-quiet-announces-dark-power-14-power-supply-seriesRead 15 October 2026ATX 3.1 compliant.9Retailer pagescan.co.uk/products/1000w-be-quiet!-dark-power-14-fully-modular-pcie-51-80plus-titanium-quad-rail-833a-135mm-fan-atx-31Read 15 October 2026Standard ATX 3.1.

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 5.13Press articleguru3d.com/story/be-quiet-announces-dark-power-14-power-supply-seriesRead 15 October 2026Full support for PCIe 5.1 graphics cards (see also the Funkykit copy).4Press articlefunkykit.com/news/be-quiet-announces-dark-power-14-power-supply-seriesRead 15 October 2026PCIe 5.1 GPU support.9Retailer pagescan.co.uk/products/1000w-be-quiet!-dark-power-14-fully-modular-pcie-51-80plus-titanium-quad-rail-833a-135mm-fan-atx-31Read 15 October 2026PCIe 5.1 with a native 12V-2x6 connector.

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 modular1Measurementcybenetics.com/evaluations/psus/2953Read 15 October 2026DUT 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)1Measurementcybenetics.com/evaluations/psus/2953Read 15 October 2026DUT Information: OEM/ODM CWT.5Reviewhwbusters.com/psus/be-quiet-dark-power-14-1000w-atx-v3-1-psu-reviewRead 15 October 2026Technical specifications: Manufacturer (OEM) CWT.6Reviewclub386.com/be-quiet-dark-power-14-reviewRead 15 October 2026Specification table: OEM CWT.

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.

1,000W1Measurementcybenetics.com/evaluations/psus/2953Read 15 October 2026Manufacturer-provided information: Rated Power 1000 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.

40°C5Reviewhwbusters.com/psus/be-quiet-dark-power-14-1000w-atx-v3-1-psu-reviewRead 15 October 2026Technical specifications: Operating Temperature (Continuous Full Load) 0 - 40 C, the label of the Cybenetics manufacturer-provided field. The Cybenetics report page leaves that row empty. The review also notes the unit delivered full power at 46 C, which is a test and not a rating.8Retailer pageavadirect.com/DARK-POWER-14-80-PLUS-Titanium-1000W-Fully-Modular-ATX-Power-Supply/Product/19681238Read 15 October 2026General specs: Max operating temperature 40 C. The listing does not say the 40 C is the full-power rating, but it matches the HW Busters continuous full load row.

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.

Switchable3Press articleguru3d.com/story/be-quiet-announces-dark-power-14-power-supply-seriesRead 15 October 2026A button switches between multi-rail operation, the default with four 12V rails, and single-rail operation. A rear OCK key does it.5Reviewhwbusters.com/psus/be-quiet-dark-power-14-1000w-atx-v3-1-psu-reviewRead 15 October 2026Rear panel has a zero-RPM button and an OCK button that merges all 12V rails into one single rail. Spec table 'Number of 12V rails: 1' refers to that merged mode.7Reviewaphnetworks.com/reports/be-quiet-dark-power-14-1000w/2Read 15 October 2026The four +12V rails can be combined into one with a switch on the back. Multi-rail is the default.

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.

83A6Reviewclub386.com/be-quiet-dark-power-14-reviewRead 15 October 2026Four 12V rails rated 33/33/34/34 A, or 83 A combined, for 996 W. Single-rail mode is switchable. Cybenetics and HW Busters print 33/33/40/40 A for the single rails. Scan prints 83.3 A for the combined maximum. 996 W divided by 12 V is 83.0 A.7Reviewaphnetworks.com/reports/be-quiet-dark-power-14-1000w/2Read 15 October 2026Four +12V rails, two rated 33 A and two rated 40 A, up to 83 A combined, or 996 W. Total output 1000 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.

996W1Measurementcybenetics.com/evaluations/psus/2953Read 15 October 2026Power Specifications table: +12V rails 33 A, 33 A, 40 A and 40 A with 996 W combined on +12V. Total max power 1000 W.5Reviewhwbusters.com/psus/be-quiet-dark-power-14-1000w-atx-v3-1-psu-reviewRead 15 October 2026Technical specifications: Power 12V combined 996 W, 5V + 3.3V 120 W, 5VSB 15 W.6Reviewclub386.com/be-quiet-dark-power-14-reviewRead 15 October 2026Four 12V rails, 83 A combined for 996 W.8Retailer pageavadirect.com/DARK-POWER-14-80-PLUS-Titanium-1000W-Fully-Modular-ATX-Power-Supply/Product/19681238Read 15 October 2026Max combined 12V 996 W, max combined 12V-2x6 600 W. The listing says '4 rails (no single-rail mode)', which the maker's announcement, Club386, HW Busters and APH Networks contradict, so it is not used.

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.

120W1Measurementcybenetics.com/evaluations/psus/2953Read 15 October 2026Power Specifications table: +3.3V 25 A and +5V 24 A with one combined 120 W.8Retailer pageavadirect.com/DARK-POWER-14-80-PLUS-Titanium-1000W-Fully-Modular-ATX-Power-Supply/Product/19681238Read 15 October 2026Max combined 3.3V + 5V 120 W.

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.

3A1Measurementcybenetics.com/evaluations/psus/2953Read 15 October 2026Power Specifications table: +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.

Lowest100Highest240V1Measurementcybenetics.com/evaluations/psus/2953Read 15 October 2026Manufacturer-provided information: rated voltage 100-240 Vrms, 6-13 A, 50-60 Hz.

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.

Yes1Measurementcybenetics.com/evaluations/psus/2953Read 15 October 2026ALPM (Alternative Low Power Mode) compatible, checked.5Reviewhwbusters.com/psus/be-quiet-dark-power-14-1000w-atx-v3-1-psu-reviewRead 15 October 2026Technical specifications: Alternative Low Power Mode support yes.8Retailer pageavadirect.com/DARK-POWER-14-80-PLUS-Titanium-1000W-Fully-Modular-ATX-Power-Supply/Product/19681238Read 15 October 2026Key features list modern standby support.

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 Titanium2Certification listclearesult.com/80plus/sites/80plus/files/manufacturer-certificate/BE%20QUIET_P14-1000W_1000W_SOCE%207950_Report.pdfRead 15 October 202680 PLUS ID 7950, model number P14-1000W, type ATX 3.1, rated output 1000 W, input 100-240 V 13-6 A, test date 2025-08-28: Titanium at 115V, typical efficiency 94.66% at 50% load. The certificate prints sample serials C25003518728 and C25003510109, which do not match the Cybenetics sample serial format, so the entry is matched by the model code P14-1000W and the rated values. Be quiet 80 PLUS entries 7949 (P14-850W) and 7951 (P14-1200W) are the sibling wattages.

Not available

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

Cybenetics Titanium1Measurementcybenetics.com/evaluations/psus/2953Read 15 October 2026Report 25PS2953A, certification ID 252953, issued Sep 2, 2025. ETA Titanium badge at 115V. Sample serial 020EUL5220000100 (EU model), tested Aug 30, 2025.

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 Titanium1Measurementcybenetics.com/evaluations/psus/2953Read 15 October 2026ETA Titanium 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.

A++1Measurementcybenetics.com/evaluations/psus/2953Read 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.

A++1Measurementcybenetics.com/evaluations/psus/2953Read 15 October 2026LAMBDA A++ badge at 230V.

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

Measured

9 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.

91.631%1Measurementcybenetics.com/evaluations/psus/2953Read 15 October 2026Accredited average over more than 1450 load combinations at 115V. Ambient 28-32 C. At 230V the average is 93.457%.

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.

93.457%1Measurementcybenetics.com/evaluations/psus/2953Read 15 October 2026Accredited average 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.

73.197%1Measurementcybenetics.com/evaluations/psus/2953Read 15 October 2026Efficiency at 2% load at 115V. The unit is above 500 W, so the 2% load applies. At 230V it is 75.067%.

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.

0.9921Measurementcybenetics.com/evaluations/psus/2953Read 15 October 2026Accredited average over more than 1450 load combinations at 115V. At 230V it is 0.965.

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.

10.34dB(A)1Measurementcybenetics.com/evaluations/psus/2953Read 15 October 2026Accredited average over more than 1450 load combinations at 115V, ambient 28-32 C. The 230V average is 10.37 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.

33.2dB(A)1Measurementcybenetics.com/evaluations/psus/2953Read 15 October 2026Typical Load Tests (supplementary), 100% load row at 115V: 33.2 dB(A) at 1516 rpm fan speed, intake 45.01 C and exhaust 50.77 C. Not used for certification.

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.

0.0899W1Measurementcybenetics.com/evaluations/psus/2953Read 15 October 2026Standby power consumption at 115V with no load on +5VSB. At 230V it is 0.1392 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.

17ms1Measurementcybenetics.com/evaluations/psus/2953Read 15 October 2026Hold-Up Time and PWR_OK Signal: hold-up time 17.00 ms, AC loss to PWR_OK 14.90 ms, at maximum continuous load. Report 25PS2953A.

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.

21.32mV1Measurementcybenetics.com/evaluations/psus/2953Read 15 October 2026Non-accredited. 12V ripple at full load at 115V. At 230V it is 20.56 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.

0.61%1Measurementcybenetics.com/evaluations/psus/2953Read 15 October 2026Non-accredited. 12V load regulation at 115V. At 230V it is 0.65%.

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

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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! Dark Power 14 1000W

Connector	Connectors	Cables	Length to first plug (mm)	Wire gauge	Rated power (W)
ATX 24-pin (20+4)	1	1	600	16-18AWG	Not available
CPU 8-pin (EPS, 4+4)	2	2	700	16AWG	Not available
PCIe 8-pin (6+2)	4	2	750	18AWG	Not available
12V-2x6	1	1	600	16AWG	600
SATA power	11	3	600	18AWG	Not available
SATA power	2	1	605	18AWG	Not available
4-pin Molex	2	1	605	18AWG	Not available

Source1Measurementcybenetics.com/evaluations/psus/2953Read 15 October 2026Cables and Connectors table: ATX 20+4 pin 600 mm 16-18AWG, 8-pin ATX12V and 4+4-pin ATX12V 700 mm 16AWG, 12+4 pin PCIe 600 mm 16-24AWG, SATA 600+155+155+155 mm on 2 cables (8 plugs), SATA 600+155+155 mm on 1 cable (3 plugs), one SATA 605+155 mm and 4-pin Molex +155+150 mm cable, all 18AWG. The PCIe row reads 2x 6+2 pin PCIe (750 mm) with cable count 4 and connector count 4. HW Busters lists the same four plugs as 2 cables, so the PCIe row is stored as 4 plugs on 2 cables at 750 mm. The 16-24AWG range of the 12+4 pin cable includes the thin sideband wires, so the power wire gauge is stored as 16AWG, which APH Networks also states. The AC power cord (1380 mm) is not stored.5Reviewhwbusters.com/psus/be-quiet-dark-power-14-1000w-atx-v3-1-psu-reviewRead 15 October 2026Technical specifications: 2x EPS (2 cables), 1x 12+4 pin (600 W), 4x PCIe 6+2 pin (2 cables), 13x SATA (4 cables), 2x 4-pin Molex (1 cable). Cable table identical to the Cybenetics report. The 12+4 pin cable is rated 600 W.7Reviewaphnetworks.com/reports/be-quiet-dark-power-14-1000w/2Read 15 October 2026Cable list: 1x ATX 20+4-pin 60 cm, 1x 4+4-pin 70 cm, 1x EPS 8-pin 70 cm, 1x 12V-2x6 12+4-pin 60 cm, 2x PCIe 6+2-pin with 2 connectors each, 60 cm to both, 2x SATA with 4 connectors, 1x SATA with 3 connectors, 1x SATA/Molex with 4 connectors, all with 15 cm spacing. The 24-pin, 4+4-pin, EPS and 12V-2x6 cables use 16 AWG wire, the rest 18 AWG. The PCIe length of 60 cm differs from the 750 mm in the Cybenetics report, which is stored.8Retailer pageavadirect.com/DARK-POWER-14-80-PLUS-Titanium-1000W-Fully-Modular-ATX-Power-Supply/Product/19681238Read 15 October 2026Total cables 10. Counts: 1 ATX, 1 P4+4, 1 P8, 1 12V-2x6, 4 PCIe 6+2-pin, 13 SATA, 2 PATA. The 12V-2x6 cable is rated 600 W.

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

13=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.

Sleeved5Reviewhwbusters.com/psus/be-quiet-dark-power-14-1000w-atx-v3-1-psu-reviewRead 15 October 2026Box and cables page: photo of the ten modular cables, all with fabric sleeves.7Reviewaphnetworks.com/reports/be-quiet-dark-power-14-1000w/2Read 15 October 2026All ten modular cables are sleeved. The page does not say whether the cables are also flat.

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

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

135mm1Measurementcybenetics.com/evaluations/psus/2953Read 15 October 2026Fan BQ SIW4-13525-MF, 135 mm, 12V, 0.4 A.6Reviewclub386.com/be-quiet-dark-power-14-reviewRead 15 October 2026135 mm be quiet! Silent Wings (BQ SIW4-13525-MF), max 2,100 rpm.

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.

Fluid dynamic (FDB)1Measurementcybenetics.com/evaluations/psus/2953Read 15 October 2026Fan BQ SIW4-13525-MF, fluid dynamic bearing.3Press articleguru3d.com/story/be-quiet-announces-dark-power-14-power-supply-seriesRead 15 October 2026Silent Wings fan integrated into the heat sink with a 6-pole motor and a fluid-dynamic bearing.6Reviewclub386.com/be-quiet-dark-power-14-reviewRead 15 October 2026Fluid dynamic bearing, 6-pole motor.

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-passive1Measurementcybenetics.com/evaluations/psus/2953Read 15 October 2026Semi-Passive Operation checked, selectable.

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.

Yes3Press articleguru3d.com/story/be-quiet-announces-dark-power-14-power-supply-seriesRead 15 October 2026A rear button selects balanced active cooling, where the fan always spins, or semi-passive mode, where the fan stays off under low load.5Reviewhwbusters.com/psus/be-quiet-dark-power-14-1000w-atx-v3-1-psu-reviewRead 15 October 2026Rear panel switch activates the zero-RPM fan mode.6Reviewclub386.com/be-quiet-dark-power-14-reviewRead 15 October 2026A rear button switches between active cooling (fan always spinning) and semi-passive cooling. Rear controls are a power button, a 0 rpm button and an OCK button.10Retailer pageldlc.pro/fiche/PB00712442.htmlRead 15 October 2026Cooling mode selectable with a button.

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Protection and parts

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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)1Measurementcybenetics.com/evaluations/psus/2953Read 15 October 2026Protection Features (Manufacturer) lists OPP, OCP (+12V), OTP, SCP, surge protection and inrush current protection. The protection tests tick UVP at 90 V full load and no damage at 80 V, and NLO. Fan failure protection is marked absent and OVP has no row, so OVP comes from the maker's announcement.3Press articleguru3d.com/story/be-quiet-announces-dark-power-14-power-supply-seriesRead 15 October 2026Lists overcurrent, overvoltage, undervoltage, short circuit, overheating, overload and input-side surge protection.8Retailer pageavadirect.com/DARK-POWER-14-80-PLUS-Titanium-1000W-Fully-Modular-ATX-Power-Supply/Product/19681238Read 15 October 2026Protections: OTP, OCP, OPP, SCP, OVP, UVP and SIP (surge and inrush).

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.

Yes3Press articleguru3d.com/story/be-quiet-announces-dark-power-14-power-supply-seriesRead 15 October 2026Text: premium-quality Japanese capacitors rated to 105 C. No exception is named. The Cybenetics teardown lists Nichicon, Rubycon and Nippon Chemi-Con electrolytic capacitors but also 19 FPCAP polymer capacitors, a Taiwanese brand.

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.

100,000h8Retailer pageavadirect.com/DARK-POWER-14-80-PLUS-Titanium-1000W-Fully-Modular-ATX-Power-Supply/Product/19681238Read 15 October 2026Average lifetime more than 100,000 h 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

1 of 4 differ

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

No10Retailer pageldlc.pro/fiche/PB00712442.htmlRead 15 October 2026The spec table lists RGB as no.

Not available

Dimensions and weight

2 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.

Width150Height86Depth175mm(5.9 × 3.4 × 6.9 in)6Reviewclub386.com/be-quiet-dark-power-14-reviewRead 15 October 2026Specification table: 150 x 86 x 175 mm (W x H x D).7Reviewaphnetworks.com/reports/be-quiet-dark-power-14-1000w/2Read 15 October 2026Depth is 17.5 cm. Width and height are not given on the page.8Retailer pageavadirect.com/DARK-POWER-14-80-PLUS-Titanium-1000W-Fully-Modular-ATX-Power-Supply/Product/19681238Read 15 October 2026175 x 150 x 86 mm (L x W x H) without cables, weight 2.2 kg.10Retailer pageldlc.pro/fiche/PB00712442.htmlRead 15 October 202686 x 150 x 175 mm (H x W x L), weight 2.2 kg.

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.

2.23kg(4.9 lb)5Reviewhwbusters.com/psus/be-quiet-dark-power-14-1000w-atx-v3-1-psu-reviewRead 15 October 2026Technical specifications: 2.23 kg (4.92 lb). The review does not say whether cables are included. Club386, LDLC, Paradigit and AvaDirect list 2.2 kg.

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

None of 1 known

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

Not available

Not available

Links

Not compared

Product page

Not available

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

Not available

Not available

Manual

Not available

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.

10years3Press articleguru3d.com/story/be-quiet-announces-dark-power-14-power-supply-seriesRead 15 October 2026Comprehensive 10-year manufacturer's warranty.8Retailer pageavadirect.com/DARK-POWER-14-80-PLUS-Titanium-1000W-Fully-Modular-ATX-Power-Supply/Product/19681238Read 15 October 2026Warranty 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.