Power supplies / Compare

CORSAIR RM750x (2024) vs CORSAIR RM850x (2024)

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Product A: CORSAIR

RM750x (2024)

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B

Product B: CORSAIR

RM850x (2024)

52 of 66 known

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Only differences

ACORSAIR RM750x (2024)

BCORSAIR RM850x (2024)

General

2 of 12 differ

Series

RMx1Maker product pagecorsair.com/us/en/p/psu/cp-9020285-na/rmx-series-rm750x-fully-modular-power-supply-cp-9020285-naRead 15 October 2026Page title RMx Series RM750x.

RMx1Maker product pagecorsair.com/us/en/p/psu/cp-9020270-na/rmx-series-rm850x-fully-modular-power-supply-cp-9020270-naRead 14 October 2026

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

CP-9020285-NA, CP-9020285-EU, CP-9020285-UK1Maker product pagecorsair.com/us/en/p/psu/cp-9020285-na/rmx-series-rm750x-fully-modular-power-supply-cp-9020285-naRead 15 October 2026SKU CP-9020285-NA. The EU and UK units are CP-9020285-EU and CP-9020285-UK, listed on Corsair's German and UK pages with the same Tech Specs. The Japan unit is CP-9020285-JP and is not stored.6Maker product pagecorsair.com/de/de/p/psu/cp-9020285-eu/rmx-series-rm750x-fully-modular-power-supply-eu-cp-9020285-euRead 15 October 2026German page SKU CP-9020285-EU with the same Tech Specs.7Maker product pagecorsair.com/uk/en/p/psu/cp-9020285-uk/rmx-series-rm750x-fully-modular-power-supply-uk-cp-9020285-ukRead 15 October 2026UK page SKU CP-9020285-UK with the same Tech Specs.12Retailer pagescan.co.uk/products/750w-corsair-rmx-series-rm750x-fully-modular-cybenetics-gold-pcie-51-single-rail-625a-140mm-fan-atxRead 15 October 2026Scan lists CP-9020285-UK.

CP-9020270-NA, CP-9020270-EU, CP-9020270-UK1Maker product pagecorsair.com/us/en/p/psu/cp-9020270-na/rmx-series-rm850x-fully-modular-power-supply-cp-9020270-naRead 14 October 2026SKU CP-9020270-NA. The EU and UK units are CP-9020270-EU and CP-9020270-UK, listed on Corsair's German page and by UK retailers with the same Tech Specs. The Japan unit is CP-9020270-JP and is not stored.10Retailer pagescan.co.uk/products/850w-corsair-rmx-series-rm850x-black-fully-modular-cybenetics-gold-pcie-51-single-rail-140mm-fan-atxRead 14 October 2026Scan lists CP-9020270-UK.

GTIN / EAN

840006676898, 840006676850, 84000667691110Retailer pagefleetnetwork.ca/products/cp-9020285-naRead 15 October 2026FleetNetwork lists CP-9020285-NA with UPC 840006676898. The check digit is valid. This is the only source for the NA code.11Retailer pagekomputronik.pl/product/934341/zasilacz-pc-corsair-rm750x-cp-9020285-eu.htmlRead 15 October 2026Komputronik lists producer code CP-9020285-EU with EAN 840006676850. custompc.com.cy lists the same code and EAN.12Retailer pagescan.co.uk/products/750w-corsair-rmx-series-rm750x-fully-modular-cybenetics-gold-pcie-51-single-rail-625a-140mm-fan-atxRead 15 October 2026Scan lists manufacturer code CP-9020285-UK with GTIN 840006676911.

840006667506, 840006667445, 8400066675448Spec databasecomparateur-gamer.fr/prix/corsair-rm850x-2024-840006667445Read 14 October 2026EAN 840006667445 with reference CP-9020270-EU.9Retailer pageebay.com/p/22074154707Read 14 October 2026eBay product page for CP-9020270-NA shows UPC 0840006667506. This is the only source for the NA code. The check digit is valid.10Retailer pagescan.co.uk/products/850w-corsair-rmx-series-rm850x-black-fully-modular-cybenetics-gold-pcie-51-single-rail-140mm-fan-atxRead 14 October 2026Scan lists manufacturer code CP-9020270-UK with GTIN 840006667544.

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

10 September 20243Press releasecorsair.com/newsroom/press-release/corsair-updates-popular-rmx-series-low-noise-power-supplies-with-atx-3-1-compliance-and-native-atx-12v-2x6-connectorRead 15 October 2026Press release dated September 10, 2024.

10 September 20244Press releasecorsair.com/newsroom/press-release/corsair-updates-popular-rmx-series-low-noise-power-supplies-with-atx-3-1-compliance-and-native-atx-12v-2x6-connectorRead 14 October 2026Press release dated September 10, 2024.

Status

Available1Maker product pagecorsair.com/us/en/p/psu/cp-9020285-na/rmx-series-rm750x-fully-modular-power-supply-cp-9020285-naRead 15 October 2026Page shows In Stock.

Available1Maker product pagecorsair.com/us/en/p/psu/cp-9020270-na/rmx-series-rm850x-fully-modular-power-supply-cp-9020270-naRead 14 October 2026Page shows the product in stock.

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.

$119.994Maker product pageweb.archive.org/web/20240912173053/https://www.corsair.com/us/en/p/psu/CP-9020285-NA/rmx-series-rm750x-fully-modular-power-supply-cp-9020285-naRead 15 October 2026Archived copy of the Corsair US page from 2024-09-12, two days after launch. It shows a price of 119.99 USD with no discount, excluding sales tax. Hardware Busters gives an MSRP of 120 USD excluding VAT. The page today shows 134.99 USD, which is a later price.9Reviewhwbusters.com/psus/corsair-rm750x-atx-v3-1-psu-reviewRead 15 October 2026Technical specifications: MSRP (excluding VAT) 120 USD. Review published September 16, 2024.

$149.993Maker product pageweb.archive.org/web/20240913090852/https://www.corsair.com/us/en/p/psu/cp-9020270-na/rmx-series-rm850x-fully-modular-power-supply-cp-9020270-naRead 14 October 2026Archived copy of the Corsair US page from 2024-09-13, three days after launch. It shows a regular price of 149.99 USD with no discount, excluding sales tax. Hardware Busters gives an MSRP of 150 USD excluding VAT. TweakTown prints 169.99 USD, which is the later list price on Corsair's page today.6Reviewhwbusters.com/psus/corsair-rm850x-atx-v3-1-psu-reviewRead 14 October 2026Technical specifications: MSRP (excluding VAT) 150 USD. Review published September 14, 2024.

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.

€154.95Maker product pageweb.archive.org/web/20240927070234/https://www.corsair.com/de/de/p/psu/cp-9020285-eu/rmx-series-rm750x-fully-modular-power-supply-eu-cp-9020285-euRead 15 October 2026Archived copy of the Corsair German page (Germany) from 2024-09-27, 17 days after launch. It shows 154.90 EUR including VAT with no discount or original price. The page today shows 144.90 EUR as the original price, so the price has changed since. The earliest archived German capture is the one stored.

Not available

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

Not available

Not available

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.

ATX1Maker product pagecorsair.com/us/en/p/psu/cp-9020285-na/rmx-series-rm750x-fully-modular-power-supply-cp-9020285-naRead 15 October 2026Tech Specs: Dimensions 160x150x86. The back face is 150 x 86 mm, the standard ATX size.

ATX1Maker product pagecorsair.com/us/en/p/psu/cp-9020270-na/rmx-series-rm850x-fully-modular-power-supply-cp-9020270-naRead 14 October 2026Tech Specs: Dimensions 160x150x86. 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 3.11Maker product pagecorsair.com/us/en/p/psu/cp-9020285-na/rmx-series-rm750x-fully-modular-power-supply-cp-9020285-naRead 15 October 2026Tech Specs: ATX12V Version 3.1.

ATX 3.11Maker product pagecorsair.com/us/en/p/psu/cp-9020270-na/rmx-series-rm850x-fully-modular-power-supply-cp-9020270-naRead 14 October 2026Tech Specs: ATX12V Version 3.1.

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 5.11Maker product pagecorsair.com/us/en/p/psu/cp-9020285-na/rmx-series-rm750x-fully-modular-power-supply-cp-9020285-naRead 15 October 2026Feature list: ATX 3.1 compliant, supporting PCIe 5.1.

PCIe 5.11Maker product pagecorsair.com/us/en/p/psu/cp-9020270-na/rmx-series-rm850x-fully-modular-power-supply-cp-9020270-naRead 14 October 2026Feature list: ATX 3.1 compliant, supporting PCIe 5.1.

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

Fully modular1Maker product pagecorsair.com/us/en/p/psu/cp-9020285-na/rmx-series-rm750x-fully-modular-power-supply-cp-9020285-naRead 15 October 2026Tech Specs: Modular Fully.

Fully modular1Maker product pagecorsair.com/us/en/p/psu/cp-9020270-na/rmx-series-rm850x-fully-modular-power-supply-cp-9020270-naRead 14 October 2026

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)8Measurementcybenetics.com/evaluations/psus/2406Read 15 October 2026DUT Information: OEM/ODM Channel Well Technology. Parts description: Manufacturer (OEM) CWT.9Reviewhwbusters.com/psus/corsair-rm750x-atx-v3-1-psu-reviewRead 15 October 2026Technical specifications: Manufacturer (OEM) Channel Well Technology (CWT).

Channel Well Technology (CWT)5Measurementcybenetics.com/evaluations/psus/2399Read 14 October 2026DUT Information: OEM/ODM Channel Well Technology. Parts description: Manufacturer (OEM) CWT.6Reviewhwbusters.com/psus/corsair-rm850x-atx-v3-1-psu-reviewRead 14 October 2026Technical specifications: OEM Channel Well Technology (CWT).

Power

3 of 9 differ

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

750W1Maker product pagecorsair.com/us/en/p/psu/cp-9020285-na/rmx-series-rm750x-fully-modular-power-supply-cp-9020285-naRead 15 October 2026Tech Specs: Continuous Power W 750 Watts.

850W1Maker product pagecorsair.com/us/en/p/psu/cp-9020270-na/rmx-series-rm850x-fully-modular-power-supply-cp-9020270-naRead 14 October 2026Tech Specs: Continuous Power W 850 Watts.

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.

50°C1Maker product pagecorsair.com/us/en/p/psu/cp-9020285-na/rmx-series-rm750x-fully-modular-power-supply-cp-9020285-naRead 15 October 2026Overview: 50 C continuous operating temperature. The press release rates the power output at a 50 C ambient temperature.3Press releasecorsair.com/newsroom/press-release/corsair-updates-popular-rmx-series-low-noise-power-supplies-with-atx-3-1-compliance-and-native-atx-12v-2x6-connectorRead 15 October 2026Rated power output at a 50 C ambient temperature.

50°C1Maker product pagecorsair.com/us/en/p/psu/cp-9020270-na/rmx-series-rm850x-fully-modular-power-supply-cp-9020270-naRead 14 October 2026Overview: 50 C continuous operating temperature. The press release rates the power output at a 50 C ambient temperature.4Press releasecorsair.com/newsroom/press-release/corsair-updates-popular-rmx-series-low-noise-power-supplies-with-atx-3-1-compliance-and-native-atx-12v-2x6-connectorRead 14 October 2026Rated power output at a 50 C ambient temperature.

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 rail9Reviewhwbusters.com/psus/corsair-rm750x-atx-v3-1-psu-reviewRead 15 October 2026Technical specifications: Number of 12V rails 1, 12V combined 750W.

Single rail6Reviewhwbusters.com/psus/corsair-rm850x-atx-v3-1-psu-reviewRead 14 October 2026Technical specifications: 12V combined 850W on 1 12V rail.

+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.

62.5A1Maker product pagecorsair.com/us/en/p/psu/cp-9020285-na/rmx-series-rm750x-fully-modular-power-supply-cp-9020285-naRead 15 October 2026Power table: +12V 62.5A, 750W, model RPS0199, part no. 75-005878.2Owner's manualcorsair.com/us/en/explorer/diy-builder/power-supply-units/corsair-rmx-seriesRead 15 October 2026RM750x power table: +12V 62.5A, 750W, model RPS0199.

70.8A1Maker product pagecorsair.com/us/en/p/psu/cp-9020270-na/rmx-series-rm850x-fully-modular-power-supply-cp-9020270-naRead 14 October 2026Power table: +12V 70.8A, 849.6W, model RPS0197, part no. 75-005876.2Owner's manualcorsair.com/us/en/explorer/diy-builder/power-supply-units/corsair-rmx-seriesRead 14 October 2026RM850x power table: +12V 70.8A, 849.6W, model RPS0197.

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

750W1Maker product pagecorsair.com/us/en/p/psu/cp-9020285-na/rmx-series-rm750x-fully-modular-power-supply-cp-9020285-naRead 15 October 2026Power table: +12V 62.5A, 750W.2Owner's manualcorsair.com/us/en/explorer/diy-builder/power-supply-units/corsair-rmx-seriesRead 15 October 2026RM750x power table: +12V 62.5A, 750W.

849.6W1Maker product pagecorsair.com/us/en/p/psu/cp-9020270-na/rmx-series-rm850x-fully-modular-power-supply-cp-9020270-naRead 14 October 2026Power table: +12V 70.8A, 849.6W.2Owner's manualcorsair.com/us/en/explorer/diy-builder/power-supply-units/corsair-rmx-seriesRead 14 October 2026RM850x power table: +12V 70.8A, 849.6W.

+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.

150W1Maker product pagecorsair.com/us/en/p/psu/cp-9020285-na/rmx-series-rm750x-fully-modular-power-supply-cp-9020285-naRead 15 October 2026Power table: +3.3V 20A and +5V 20A with one 150W cell.2Owner's manualcorsair.com/us/en/explorer/diy-builder/power-supply-units/corsair-rmx-seriesRead 15 October 2026RM750x power table: +3.3V 20A and +5V 20A, 150W.

150W1Maker product pagecorsair.com/us/en/p/psu/cp-9020270-na/rmx-series-rm850x-fully-modular-power-supply-cp-9020270-naRead 14 October 2026Power table: +3.3V 20A and +5V 20A with one 150W cell.2Owner's manualcorsair.com/us/en/explorer/diy-builder/power-supply-units/corsair-rmx-seriesRead 14 October 2026RM850x power table: +3.3V 20A and +5V 20A, 150W.

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

3A1Maker product pagecorsair.com/us/en/p/psu/cp-9020285-na/rmx-series-rm750x-fully-modular-power-supply-cp-9020285-naRead 15 October 2026Power table: +5VSB 3A, 15W.2Owner's manualcorsair.com/us/en/explorer/diy-builder/power-supply-units/corsair-rmx-seriesRead 15 October 2026RM750x power table: +5Vsb 3A, 15W.

3A1Maker product pagecorsair.com/us/en/p/psu/cp-9020270-na/rmx-series-rm850x-fully-modular-power-supply-cp-9020270-naRead 14 October 2026Power table: +5VSB 3A, 15W.2Owner's manualcorsair.com/us/en/explorer/diy-builder/power-supply-units/corsair-rmx-seriesRead 14 October 2026RM850x power table: +5Vsb 3A, 15W.

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

Lowest100Highest240V1Maker product pagecorsair.com/us/en/p/psu/cp-9020285-na/rmx-series-rm750x-fully-modular-power-supply-cp-9020285-naRead 15 October 2026Power table: AC input 100-240V, input current 10A-5A, 47-63Hz.2Owner's manualcorsair.com/us/en/explorer/diy-builder/power-supply-units/corsair-rmx-seriesRead 15 October 2026Power table: AC input rating 100V-240V, input current 10A-5A, 47Hz-63Hz.

Lowest100Highest240V1Maker product pagecorsair.com/us/en/p/psu/cp-9020270-na/rmx-series-rm850x-fully-modular-power-supply-cp-9020270-naRead 14 October 2026Power table: AC input 100-240V, input current 10A-5A, 47-63Hz.2Owner's manualcorsair.com/us/en/explorer/diy-builder/power-supply-units/corsair-rmx-seriesRead 14 October 2026Power table: AC input rating 100V-240V, input current 10A-5A, 47Hz-63Hz.

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

Yes1Maker product pagecorsair.com/us/en/p/psu/cp-9020285-na/rmx-series-rm750x-fully-modular-power-supply-cp-9020285-naRead 15 October 2026Tech Specs: Modern Standby Yes. The Cybenetics report ticks ALPM compatible.8Measurementcybenetics.com/evaluations/psus/2406Read 15 October 2026Temperature and Compliance Info: ALPM (Alternative Low Power Mode) compatible, checked.

Yes1Maker product pagecorsair.com/us/en/p/psu/cp-9020270-na/rmx-series-rm850x-fully-modular-power-supply-cp-9020270-naRead 14 October 2026Tech Specs: Modern Standby Yes. The Cybenetics report ticks ALPM compatible.5Measurementcybenetics.com/evaluations/psus/2399Read 14 October 2026Temperature and Compliance Info: ALPM (Alternative Low Power Mode) compatible, checked.

Certifications

2 of 5 differ

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.

Not available

Not available

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

Cybenetics Gold8Measurementcybenetics.com/evaluations/psus/2406Read 15 October 2026Report 24PS2406A, certification ID 252406, issued Apr 5, 2024. The ETA badge shows Gold at 115V, as does the Cybenetics performance database. The model name is RM750x (ATX v3.1). Corsair also says Cybenetics Gold without a voltage.

Cybenetics Gold5Measurementcybenetics.com/evaluations/psus/2399Read 14 October 2026Report 24PS2399A, certification ID 252399, issued Apr 1, 2024. The ETA badge shows Gold at 115V. The model name is RM850x (ATX v3.1). Corsair also says Cybenetics Gold without a voltage.

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 Gold8Measurementcybenetics.com/evaluations/psus/2406Read 15 October 2026The ETA badge shows Gold at 230V, as does the Cybenetics performance database.

Cybenetics Gold5Measurementcybenetics.com/evaluations/psus/2399Read 14 October 2026The ETA badge shows Gold 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+1Maker product pagecorsair.com/us/en/p/psu/cp-9020285-na/rmx-series-rm750x-fully-modular-power-supply-cp-9020285-naRead 15 October 2026Tech Specs: Cybenetics Noise A+, with no input voltage. The Cybenetics report shows A+ at both voltages.8Measurementcybenetics.com/evaluations/psus/2406Read 15 October 2026The LAMBDA level is A+ at 115V in the Cybenetics performance database. Corsair says A+ without a voltage.

A1Maker product pagecorsair.com/us/en/p/psu/cp-9020270-na/rmx-series-rm850x-fully-modular-power-supply-cp-9020270-naRead 14 October 2026Tech Specs: Cybenetics Noise A, with no input voltage. The Cybenetics report shows A at both voltages. The launch press release says A+, which the report does not show.5Measurementcybenetics.com/evaluations/psus/2399Read 14 October 2026The LAMBDA badge shows A at 115V.

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

A+1Maker product pagecorsair.com/us/en/p/psu/cp-9020285-na/rmx-series-rm750x-fully-modular-power-supply-cp-9020285-naRead 15 October 2026Tech Specs: Cybenetics Noise A+, with no input voltage. The Cybenetics report shows A+ at both voltages.8Measurementcybenetics.com/evaluations/psus/2406Read 15 October 2026The LAMBDA level is A+ at 230V in the Cybenetics performance database.

A1Maker product pagecorsair.com/us/en/p/psu/cp-9020270-na/rmx-series-rm850x-fully-modular-power-supply-cp-9020270-naRead 14 October 2026Tech Specs: Cybenetics Noise A, with no input voltage. The Cybenetics report shows A at both voltages.5Measurementcybenetics.com/evaluations/psus/2399Read 14 October 2026The LAMBDA badge shows A at 230V.

Measured

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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.

88.701%8Measurementcybenetics.com/evaluations/psus/2406Read 15 October 2026Average over more than 1450 load combinations at 115V. Tested Apr 4, 2024 on sample serial A7QQA404M007FC, received Mar 14, 2024. Ambient 28-32 C. DUT note: CP-9020285 (Semi-Passive Off).

88.815%5Measurementcybenetics.com/evaluations/psus/2399Read 14 October 2026Average over more than 1450 load combinations at 115V. Tested Mar 29, 2024 on sample serial A6GGA404K007EE, received Mar 14, 2024. Ambient 28-32 C. DUT note: CP-9020270 (Semi-Passive Off).

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

90.857%8Measurementcybenetics.com/evaluations/psus/2406Read 15 October 2026Average over more than 1450 load combinations at 230V.

90.944%5Measurementcybenetics.com/evaluations/psus/2399Read 14 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.

73.996%8Measurementcybenetics.com/evaluations/psus/2406Read 15 October 2026Efficiency at 2% load (more than 500 W unit) at 115V.

75.825%5Measurementcybenetics.com/evaluations/psus/2399Read 14 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.

0.9898Measurementcybenetics.com/evaluations/psus/2406Read 15 October 2026Average over more than 1450 load combinations at 115V.

0.995Measurementcybenetics.com/evaluations/psus/2399Read 14 October 2026Average over more than 1450 load combinations at 115V.

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.

19.33dB(A)8Measurementcybenetics.com/evaluations/psus/2406Read 15 October 2026Average over more than 1450 load combinations at 115V. Ambient 28-32 C. Bruel and Kjaer 2270 G4 sound analyzer. The DUT note says semi-passive off, but the typical load table shows the fan at 0 rpm from 10% to 30% load at 115V, so the report does not make clear whether the fan ran in every part of the average. The 230V average is 19.14 dBA.

21.34dB(A)5Measurementcybenetics.com/evaluations/psus/2399Read 14 October 2026Average over more than 1450 load combinations at 115V. Ambient 28-32 C. Bruel and Kjaer 2270 G4 sound analyzer. The DUT note says semi-passive off, but the typical load table shows the fan at 0 rpm from 10% to 50% load, so the report does not make clear whether the fan ran in every part of the average. The 230V average is 21.37 dBA.

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.

45.2dB(A)8Measurementcybenetics.com/evaluations/psus/2406Read 15 October 2026Typical load tests at 115V, 100% load row: 45.2 dB(A) at 1730 rpm fan speed, ambient about 30 C. At 230V it is 45.6 dB(A) at 1752 rpm.

30.8dB(A)5Measurementcybenetics.com/evaluations/psus/2399Read 14 October 2026Typical load tests at 115V, 100% load row: 30.8 dB(A) at 986 rpm fan speed, ambient about 30 C. At 230V it is also 30.8 dB(A) at 986 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.

0.0174W8Measurementcybenetics.com/evaluations/psus/2406Read 15 October 2026Standby power consumption at 115V with no load on +5VSB.

0.0179W5Measurementcybenetics.com/evaluations/psus/2399Read 14 October 2026Standby power consumption at 115V with no load on +5VSB.

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.

26.6ms8Measurementcybenetics.com/evaluations/psus/2406Read 15 October 2026Hold-Up Time and PWR_OK Signal: hold-up time 26.60 ms, AC loss to PWR_OK 22.90 ms, PWR_OK inactive to DC loss 3.70 ms, at maximum continuous load. The report names no input voltage.

25ms5Measurementcybenetics.com/evaluations/psus/2399Read 14 October 2026Hold-Up Time and PWR_OK Signal: hold-up time 25.00 ms, AC loss to PWR_OK 21.30 ms, PWR_OK inactive to DC loss 3.70 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.

23.08mV8Measurementcybenetics.com/evaluations/psus/2406Read 15 October 2026Non-accredited measurement. 12V ripple at full load at 115V. At 230V it is 23.75 mV.

24.2mV5Measurementcybenetics.com/evaluations/psus/2399Read 14 October 2026Non-accredited measurement. 12V ripple at full load at 115V. At 230V it is 25.82 mV.

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

0.65%8Measurementcybenetics.com/evaluations/psus/2406Read 15 October 2026Non-accredited measurement. 12V load regulation at 115V. At 230V it is 0.64%.

0.63%5Measurementcybenetics.com/evaluations/psus/2399Read 14 October 2026Non-accredited measurement. 12V load regulation at 115V. At 230V it is 0.64%.

Cables and connectors

2 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.

ACORSAIR RM750x (2024)

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	750	18AWG	Not available
PCIe 8-pin (6+2)	4	3	650	16-18AWG	Not available
12V-2x6	1	1	650	Not available	600
SATA power	8	2	505	18AWG	Not available
4-pin Molex	3	1	550	18AWG	Not available

Source1Maker product pagecorsair.com/us/en/p/psu/cp-9020285-na/rmx-series-rm750x-fully-modular-power-supply-cp-9020285-naRead 15 October 2026Cable listing: 1 ATX 24-pin 610 mm, 2 EPS 8-pin (4+4) 750 mm, 2 PCIe 8-pin (6+2) cables with one plug each, 1 PCIe 12V-2x6 to Dual 8-Pin (6+2) cable with two plugs, 1 PCIe 12V-2x6 (12+4) cable, all three PCIe cable types 650 mm, 2 SATA cables with 4 plugs each (505 mm to the first plug, 115 mm spacing, 850 mm total), 1 PATA cable with 3 plugs (550 mm to the first plug, 100 mm spacing, 750 mm total). All lengths have a tolerance of 10 mm, the PATA cable 25 mm. PATA plugs are the 4-pin Molex plugs. The 12V-2x6 to dual 8-pin cable counts as PCIe 8-pin, so there are 4 PCIe 8-pin plugs on 3 cables. It starts at the 12V-2x6 socket of the PSU, so it shares that socket with the 12V-2x6 cable. Hardware Busters and Cybenetics list 3 PCIe 6+2 cables with 3 plugs and no dual cable, which does not match the maker's list. The page does not rate the 12V-2x6 cable. The Cybenetics report and Hardware Busters list it at 600 W. Gauges come from the Cybenetics report.2Owner's manualcorsair.com/us/en/explorer/diy-builder/power-supply-units/corsair-rmx-seriesRead 15 October 2026Included cables: 1x ATX 24-pin 610 mm, 2x EPS/ATX12V 8-pin (4+4) 750 mm, 1x PCIe 12V-2x6 (12+4) 650 mm, 2x PCIe 8-pin (6+2) 650 mm (RM750x), 1x 12V-2x6 to Dual 8-pin (6+2) 650 mm (RM750x only), 2x SATA with 4 plugs 850 mm, 1x PATA with 3 plugs 750 mm.8Measurementcybenetics.com/evaluations/psus/2406Read 15 October 2026Cables and Connectors table: ATX 16-20AWG, EPS 18AWG, 6+2 pin PCIe 16-18AWG, 12+2 pin PCIe (600W) 16-24AWG, SATA 18AWG and Molex 18AWG, no in-cable capacitors. The report lists 3 PCIe 6+2 cables with 3 connectors, which does not match the maker's dual 8-pin cable. The 16-24AWG range for the 12V-2x6 cable includes the thin sideband wires, so no gauge is stored for it. Cybenetics lists the SATA cable at 500 mm, which is not stored.9Reviewhwbusters.com/psus/corsair-rm750x-atx-v3-1-psu-reviewRead 15 October 2026Cables page: the same cable table as the Cybenetics report. The text says the modular board has ten sockets, one of them 12V-2x6, and no pair of 8-pin sockets for the high-power PCIe connector.

BCORSAIR RM850x (2024)

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	750	18AWG	Not available
PCIe 8-pin (6+2)	3	3	650	16-18AWG	Not available
12V-2x6	1	1	650	Not available	600
SATA power	8	2	505	18AWG	Not available
4-pin Molex	3	1	550	18AWG	Not available

Source1Maker product pagecorsair.com/us/en/p/psu/cp-9020270-na/rmx-series-rm850x-fully-modular-power-supply-cp-9020270-naRead 14 October 2026Cable listing: 1 ATX 24-pin 610 mm, 2 EPS 8-pin (4+4) 750 mm, 1 PCIe 12V-2x6 (12+4) 650 mm, 3 PCIe 8-pin (6+2) 650 mm, 2 SATA cables with 4 plugs each (505 mm to the first plug, 115 mm spacing, 850 mm total), 1 PATA cable with 3 plugs (550 mm to the first plug, 100 mm spacing, 750 mm total). All lengths have a tolerance of 10 mm, the PATA cable 25 mm. PATA plugs are the 4-pin Molex plugs. The page does not rate the 12V-2x6 cable. The Cybenetics report and Hardware Busters list it at 600 W. Gauges come from the Cybenetics report. The 16-24AWG range for the 12V-2x6 cable includes the thin sideband wires, so no gauge is stored for it. Cybenetics lists the SATA cable at 500 mm, which is not stored.2Owner's manualcorsair.com/us/en/explorer/diy-builder/power-supply-units/corsair-rmx-seriesRead 14 October 2026Included cables: 1x ATX 24-pin 610 mm, 2x EPS 8-pin (4+4) 750 mm, 1x PCIe 12V-2x6 (12+4) 650 mm, 3x PCIe 8-pin (6+2) 650 mm, 2x SATA with 4 plugs 850 mm, 1x PATA with 3 plugs 750 mm.5Measurementcybenetics.com/evaluations/psus/2399Read 14 October 2026Cables and Connectors table: ATX 16-20AWG, EPS 18AWG, 6+2 pin PCIe 16-18AWG, 12+2 pin PCIe (600W) 16-24AWG, SATA 18AWG and Molex 18AWG, no in-cable capacitors. The 12V-2x6 cable is listed at 650 mm.

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

3=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

8=CalculatedFrom Cables

8=CalculatedFrom Cables

4-pin Molex connectors

3=CalculatedFrom Cables

3=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.

Embossed or debossed flat1Maker product pagecorsair.com/us/en/p/psu/cp-9020285-na/rmx-series-rm750x-fully-modular-power-supply-cp-9020285-naRead 15 October 2026Cable listing: Cable Type Embossed for every cable. The Tech Specs row says Type 4.3Press releasecorsair.com/newsroom/press-release/corsair-updates-popular-rmx-series-low-noise-power-supplies-with-atx-3-1-compliance-and-native-atx-12v-2x6-connectorRead 15 October 2026Fully modular, embossed, ultra-flexible cables.

Embossed or debossed flat1Maker product pagecorsair.com/us/en/p/psu/cp-9020270-na/rmx-series-rm850x-fully-modular-power-supply-cp-9020270-naRead 14 October 2026Cable listing: Cable Type Embossed for every cable. The Tech Specs row says Type 4.4Press releasecorsair.com/newsroom/press-release/corsair-updates-popular-rmx-series-low-noise-power-supplies-with-atx-3-1-compliance-and-native-atx-12v-2x6-connectorRead 14 October 2026Fully modular, embossed, ultra-flexible cables.6Reviewhwbusters.com/psus/corsair-rm850x-atx-v3-1-psu-reviewRead 14 October 2026Cables page: all cables are embossed.

Fan

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

140mm1Maker product pagecorsair.com/us/en/p/psu/cp-9020285-na/rmx-series-rm750x-fully-modular-power-supply-cp-9020285-naRead 15 October 2026Overview: 140mm low-noise fan.3Press releasecorsair.com/newsroom/press-release/corsair-updates-popular-rmx-series-low-noise-power-supplies-with-atx-3-1-compliance-and-native-atx-12v-2x6-connectorRead 15 October 2026140mm fan.8Measurementcybenetics.com/evaluations/psus/2406Read 15 October 2026Cooling: 140mm Fluid Dynamic Bearing Fan (NR140HP).

140mm1Maker product pagecorsair.com/us/en/p/psu/cp-9020270-na/rmx-series-rm850x-fully-modular-power-supply-cp-9020270-naRead 14 October 2026Overview: 140mm low-noise fan.4Press releasecorsair.com/newsroom/press-release/corsair-updates-popular-rmx-series-low-noise-power-supplies-with-atx-3-1-compliance-and-native-atx-12v-2x6-connectorRead 14 October 2026140mm fan.5Measurementcybenetics.com/evaluations/psus/2399Read 14 October 2026Cooling: 140mm Fluid Dynamic Bearing Fan (NR140HP), 12V, 0.33A.

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)1Maker product pagecorsair.com/us/en/p/psu/cp-9020285-na/rmx-series-rm750x-fully-modular-power-supply-cp-9020285-naRead 15 October 2026Overview: a fluid dynamic bearing fan with magnetic dome structure. The bearing is stored as fluid dynamic, since the maker names the dome as a structure of the fan and not as the bearing.3Press releasecorsair.com/newsroom/press-release/corsair-updates-popular-rmx-series-low-noise-power-supplies-with-atx-3-1-compliance-and-native-atx-12v-2x6-connectorRead 15 October 2026140mm Fluid-Dynamic Bearing fan.8Measurementcybenetics.com/evaluations/psus/2406Read 15 October 2026Cooling: Fluid Dynamic Bearing fan.

Fluid dynamic (FDB)1Maker product pagecorsair.com/us/en/p/psu/cp-9020270-na/rmx-series-rm850x-fully-modular-power-supply-cp-9020270-naRead 14 October 2026Overview: a fluid dynamic bearing fan with magnetic dome structure. The Cybenetics report lists a Fluid Dynamic Bearing fan. The bearing is stored as fluid dynamic, since the maker names the dome as a structure of the fan and not as the bearing.4Press releasecorsair.com/newsroom/press-release/corsair-updates-popular-rmx-series-low-noise-power-supplies-with-atx-3-1-compliance-and-native-atx-12v-2x6-connectorRead 14 October 2026140mm fluid-dynamic bearing (FDB) fan.5Measurementcybenetics.com/evaluations/psus/2399Read 14 October 2026Cooling: 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-passive1Maker product pagecorsair.com/us/en/p/psu/cp-9020285-na/rmx-series-rm750x-fully-modular-power-supply-cp-9020285-naRead 15 October 2026Tech Specs: Zero RPM Mode Yes. The fan is off at low to medium loads.8Measurementcybenetics.com/evaluations/psus/2406Read 15 October 2026Semi-Passive Operation checked and selectable.

Semi-passive1Maker product pagecorsair.com/us/en/p/psu/cp-9020270-na/rmx-series-rm850x-fully-modular-power-supply-cp-9020270-naRead 14 October 2026Tech Specs: Zero RPM Mode Yes. The fan is off at low to medium loads.5Measurementcybenetics.com/evaluations/psus/2399Read 14 October 2026Semi-Passive Operation checked and selectable.

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.

Yes1Maker product pagecorsair.com/us/en/p/psu/cp-9020285-na/rmx-series-rm750x-fully-modular-power-supply-cp-9020285-naRead 15 October 2026Overview: a manual fan override knob overrides the Zero RPM mode and the low-noise profile.2Owner's manualcorsair.com/us/en/explorer/diy-builder/power-supply-units/corsair-rmx-seriesRead 15 October 2026Fan speed knob: use this knob to override the Zero RPM fan mode and adjust the minimum starting fan speed.3Press releasecorsair.com/newsroom/press-release/corsair-updates-popular-rmx-series-low-noise-power-supplies-with-atx-3-1-compliance-and-native-atx-12v-2x6-connectorRead 15 October 2026Users can override the fanless low-load operation with the included knob on the rear of the unit.8Measurementcybenetics.com/evaluations/psus/2406Read 15 October 2026Semi-Passive Operation is listed as selectable.

Not available

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)2Owner's manualcorsair.com/us/en/explorer/diy-builder/power-supply-units/corsair-rmx-seriesRead 15 October 2026Safety and protection section: OVP and UVP on 12V, 5V and 3.3V, OCP on 3.3V, 5V and 12V, OTP, SCP and OPP. The six maker protections are stored together with NLO and SIP from the Cybenetics tests shown by Hardware Busters.9Reviewhwbusters.com/psus/corsair-rm750x-atx-v3-1-psu-reviewRead 15 October 2026Protection Features page, which presents the Cybenetics protection tests: OCP, OPP, OTP, SCP, NLO, fan failure protection and SIP (surge MOV, inrush NTC thermistor and bypass relay) all shown. The page has no OVP or UVP row.

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-seriesRead 14 October 2026Protections section: OVP and UVP on 12V, 5V and 3.3V, OCP on 3.3V, 5V and 12V, OTP, SCP and OPP. The six maker protections are stored together with NLO and SIP from the Cybenetics tests.6Reviewhwbusters.com/psus/corsair-rm850x-atx-v3-1-psu-reviewRead 14 October 2026Protection Features page, which presents the Cybenetics protection tests: OCP, OPP, OTP, SCP, NLO, fan failure protection and SIP (surge MOV, inrush NTC thermistor and bypass relay) all shown. The page has no OVP or UVP row.

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.

Yes1Maker product pagecorsair.com/us/en/p/psu/cp-9020285-na/rmx-series-rm750x-fully-modular-power-supply-cp-9020285-naRead 15 October 2026Overview: 100% industrial-grade, 105 C rated Japanese electrolytic capacitors.3Press releasecorsair.com/newsroom/press-release/corsair-updates-popular-rmx-series-low-noise-power-supplies-with-atx-3-1-compliance-and-native-atx-12v-2x6-connectorRead 15 October 2026100% Japanese electrolytic capacitors.

Yes1Maker product pagecorsair.com/us/en/p/psu/cp-9020270-na/rmx-series-rm850x-fully-modular-power-supply-cp-9020270-naRead 14 October 2026Overview: 100% industrial-grade, 105 C rated Japanese electrolytic capacitors.4Press releasecorsair.com/newsroom/press-release/corsair-updates-popular-rmx-series-low-noise-power-supplies-with-atx-3-1-compliance-and-native-atx-12v-2x6-connectorRead 14 October 2026100% Japanese electrolytic 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.

100,000h1Maker product pagecorsair.com/us/en/p/psu/cp-9020285-na/rmx-series-rm750x-fully-modular-power-supply-cp-9020285-naRead 15 October 2026Tech Specs: MTBF Hours 100,000 hours. The test temperature is not stated.

100,000h1Maker product pagecorsair.com/us/en/p/psu/cp-9020270-na/rmx-series-rm850x-fully-modular-power-supply-cp-9020270-naRead 14 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)1Maker product pagecorsair.com/us/en/p/psu/cp-9020285-na/rmx-series-rm750x-fully-modular-power-supply-cp-9020285-naRead 15 October 2026Tech Specs: 160x150x86 with no unit. The manual 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-seriesRead 15 October 2026RM750x specifications: length 160 mm, width 150 mm, height 86 mm.

Width150Height86Depth160mm(5.9 × 3.4 × 6.3 in)1Maker product pagecorsair.com/us/en/p/psu/cp-9020270-na/rmx-series-rm850x-fully-modular-power-supply-cp-9020270-naRead 14 October 2026Tech Specs: 160x150x86 with no unit. The manual 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-seriesRead 14 October 2026RM850x specifications: length 160 mm, width 150 mm, height 86 mm.

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.

1.77kg(3.9 lb)9Reviewhwbusters.com/psus/corsair-rm750x-atx-v3-1-psu-reviewRead 15 October 2026Technical specifications: 1.77 kg (3.9 lb). Corsair's 3 kg figure is not stored, since it is most likely a packed weight.

1.79kg(3.9 lb)6Reviewhwbusters.com/psus/corsair-rm850x-atx-v3-1-psu-reviewRead 14 October 2026Technical specifications: 1.79 kg (3.95 lb). Corsair's 3 kg figure is not stored, since it is most likely a packed weight.7Reviewigorslab.de/en/corsair-rm850x-atx-v3-1-power-supply-2024-testRead 14 October 2026Igor's Lab copy of the Hardware Busters review, published November 6, 2024. It lists 1.79 kg and 150 x 85 x 160 mm. The maker's 86 mm height is 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

www.corsair.com/us/en/p/psu/cp-9020285-na/rmx-series-rm750x-fully-modular-power-supply-cp-9020285-na1Maker product pagecorsair.com/us/en/p/psu/cp-9020285-na/rmx-series-rm750x-fully-modular-power-supply-cp-9020285-naRead 15 October 2026

www.corsair.com/us/en/p/psu/cp-9020270-na/rmx-series-rm850x-fully-modular-power-supply-cp-9020270-na1Maker product pagecorsair.com/us/en/p/psu/cp-9020270-na/rmx-series-rm850x-fully-modular-power-supply-cp-9020270-naRead 14 October 2026

Spec sheet

Not available

Not available

Manual

www.corsair.com/us/en/explorer/diy-builder/power-supply-units/corsair-rmx-series2Owner's manualcorsair.com/us/en/explorer/diy-builder/power-supply-units/corsair-rmx-seriesRead 15 October 2026

www.corsair.com/us/en/explorer/diy-builder/power-supply-units/corsair-rmx-series2Owner's manualcorsair.com/us/en/explorer/diy-builder/power-supply-units/corsair-rmx-seriesRead 14 October 2026

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.

Not available

Not available

Warranty

0 of 1 differ

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.

10years1Maker product pagecorsair.com/us/en/p/psu/cp-9020285-na/rmx-series-rm750x-fully-modular-power-supply-cp-9020285-naRead 15 October 2026Tech Specs: Warranty 10 Year. The page is corsair.com US, so the market is US.

10years1Maker product pagecorsair.com/us/en/p/psu/cp-9020270-na/rmx-series-rm850x-fully-modular-power-supply-cp-9020270-naRead 14 October 2026Tech Specs: Warranty 10 Year. The page is corsair.com US, so the market is US.

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