Power supplies / Compare

ASRock Steel Legend SL-750G vs CORSAIR RM850x (2024)

A

Product A: ASRock

Steel Legend SL-750G

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B

Product B: CORSAIR

RM850x (2024)

52 of 66 known

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Only differences

AASRock Steel Legend SL-750G

BCORSAIR RM850x (2024)

General

5 of 12 differ

Series

Steel Legend3Retailer pageinside-tech.co.uk/power-supplies-2/asrock-steel-legend-sl-750g-750w-atx-power-supply-unit-80-plus-gold-certified-120mm-silent-cooling-fan-high-efficiency-psuRead 15 October 2026The listing copies ASRock's Steel Legend text and spec table.

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.

SL-750G7Measurementcybenetics.com/evaluations/psus/2669Read 15 October 2026The report names the model Steel Legend SL-750G. The 80 PLUS list has an SL-750G entry and no white SL-750GW entry.

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

Not available

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.

Not available

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

Available5Retailer pageparadigit.ie/asrock-steel-legend-sl-750g/21750212/productRead 15 October 2026Listing shows the unit in stock in October 2026 with delivery in 4 to 5 working days.

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.

Not available

$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.

Not available

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

Steel Black3Retailer pageinside-tech.co.uk/power-supplies-2/asrock-steel-legend-sl-750g-750w-atx-power-supply-unit-80-plus-gold-certified-120mm-silent-cooling-fan-high-efficiency-psuRead 15 October 2026The listing is the black unit (Colour: Black). ASRock's text names the series colours as Steel Black and Steel White. The 80 PLUS list and retailers show a white model only for the 850W, 1000W and 1200W units, so only the black colour is stored.

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.

ATX3Retailer pageinside-tech.co.uk/power-supplies-2/asrock-steel-legend-sl-750g-750w-atx-power-supply-unit-80-plus-gold-certified-120mm-silent-cooling-fan-high-efficiency-psuRead 15 October 2026The 150 x 150 x 86 mm body is an ATX unit with the 150 x 86 mm back face.7Measurementcybenetics.com/evaluations/psus/2669Read 15 October 2026DUT Information: Type ATX12V.

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 3.13Retailer pageinside-tech.co.uk/power-supplies-2/asrock-steel-legend-sl-750g-750w-atx-power-supply-unit-80-plus-gold-certified-120mm-silent-cooling-fan-high-efficiency-psuRead 15 October 2026Spec table row ATX 12V Version: ATX 3.1.4Retailer pagemultitronic.fi/en/products/4417379/asrock-steel-legend-sl-750g-750w---nataggregat--80-plus-goldRead 15 October 2026Box image badge ATX 3.1 COMPATIBLE. Spec table ATX 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 5.14Retailer pagemultitronic.fi/en/products/4417379/asrock-steel-legend-sl-750g-750w---nataggregat--80-plus-goldRead 15 October 2026The gallery image SL-1000G-5 on this page shows the SL-750G retail box with the badges ATX 3.1 COMPATIBLE and PCIe 5.1 READY. The description says the 12V-2x6 connector gives compatibility with PCIe 5.1 graphics cards.

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 modular3Retailer pageinside-tech.co.uk/power-supplies-2/asrock-steel-legend-sl-750g-750w-atx-power-supply-unit-80-plus-gold-certified-120mm-silent-cooling-fan-high-efficiency-psuRead 15 October 2026Product details: Modular Fully.4Retailer pagemultitronic.fi/en/products/4417379/asrock-steel-legend-sl-750g-750w---nataggregat--80-plus-goldRead 15 October 2026Spec table Cabling type: Fully-Modular.

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.

HEC7Measurementcybenetics.com/evaluations/psus/2669Read 15 October 2026DUT Information and Parts Description: OEM/ODM HEC.

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

5 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.

750W7Measurementcybenetics.com/evaluations/psus/2669Read 15 October 2026DUT Information: Rated Power 750 W. The Power Specifications table gives a total maximum power of 750 W.

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.

Not available

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 rail7Measurementcybenetics.com/evaluations/psus/2669Read 15 October 2026Power Specifications table lists one +12V column, 62.5A.

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.

62.5A3Retailer pageinside-tech.co.uk/power-supplies-2/asrock-steel-legend-sl-750g-750w-atx-power-supply-unit-80-plus-gold-certified-120mm-silent-cooling-fan-high-efficiency-psuRead 15 October 2026Spec table row Continuous 12V output: 62.5 A. The Cybenetics Power Specifications table agrees.7Measurementcybenetics.com/evaluations/psus/2669Read 15 October 2026Power Specifications table: +12V 62.5 A.

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.

750W7Measurementcybenetics.com/evaluations/psus/2669Read 15 October 2026Power Specifications table: +12V 750 W, total maximum power 750 W.

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.

120W7Measurementcybenetics.com/evaluations/psus/2669Read 15 October 2026Power Specifications table: one merged cell of 120 W under +3.3V and +5V, so it is one shared limit. Each rail is 20 A.

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.

3A7Measurementcybenetics.com/evaluations/psus/2669Read 15 October 2026Power Specifications table: +5VSB 3 A, 15 W.

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.

Lowest100Highest240V3Retailer pageinside-tech.co.uk/power-supplies-2/asrock-steel-legend-sl-750g-750w-atx-power-supply-unit-80-plus-gold-certified-120mm-silent-cooling-fan-high-efficiency-psuRead 15 October 2026Spec table row AC Input: 100-240V, 50-60Hz, 10-5A.7Measurementcybenetics.com/evaluations/psus/2669Read 15 October 2026DUT Information: Rated Voltage 100-240 Vrms, manufacturer-provided.

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.

Yes7Measurementcybenetics.com/evaluations/psus/2669Read 15 October 2026Temperature and Compliance Info: ALPM (Alternative Low Power Mode) compatible, checked. ATX v3.1 PSU Power Excursion is also checked. The ATX 3.1 badge on the report reads Outside Validation Scope.

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

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

80 PLUS Gold8Certification listclearesult.com/80plus/sites/80plus/files/manufacturer-certificate/ASROCK_SL-750G_750W_SOCE%207600_Report_0.pdfRead 15 October 202680 PLUS list entry ID 7600, model SL-750G, 750W, 80 PLUS Gold, tested 10/8/2024 at 115V nominal and 60 Hz (typical efficiency at 50% load 91.84%). It matches ASRock's claim of 80 PLUS Gold.

Not available

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

Cybenetics Platinum7Measurementcybenetics.com/evaluations/psus/2669Read 15 October 2026Report 24PS2669A, certification ID 252669, tested Dec 3, 2024 and issued Dec 6, 2024. ETA Platinum at 115V (badge image). ASRock's retailer copy says Cybenetics Platinum. A Brazilian retailer prints Cybenetics Gold, which the report does not show.

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 Platinum7Measurementcybenetics.com/evaluations/psus/2669Read 15 October 2026ETA Platinum at 230V (badge image).

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+7Measurementcybenetics.com/evaluations/psus/2669Read 15 October 2026LAMBDA A+ at 115V (badge image). ASRock's box badge also shows A+. The measured average of 18.76 dBA fits A+.

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+7Measurementcybenetics.com/evaluations/psus/2669Read 15 October 2026LAMBDA A+ at 230V (badge image). The measured average at 230V is 18.38 dBA.

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.

90.084%7Measurementcybenetics.com/evaluations/psus/2669Read 15 October 2026Average over more than 1450 load combinations at 115V. Ambient 28-32 C. Sample received Nov 22, 2024.

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.

92.167%7Measurementcybenetics.com/evaluations/psus/2669Read 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.

69.147%7Measurementcybenetics.com/evaluations/psus/2669Read 15 October 2026Efficiency at 10 W for units up to 500 W or at 2% load for larger units. The unit is above 500 W, so the 2% load (15 W) applies. At 230V it is 67.067%.

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.

0.9867Measurementcybenetics.com/evaluations/psus/2669Read 15 October 2026Average over more than 1450 load combinations at 115V. At 230V it is 0.963.

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.

18.76dB(A)7Measurementcybenetics.com/evaluations/psus/2669Read 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 18.38 dBA. The sample's fan ran at 593 rpm from 10% load, so the semi-passive mode was off.

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.

42dB(A)7Measurementcybenetics.com/evaluations/psus/2669Read 15 October 2026Typical load tests at 115V, 100% load row: 42 dB(A) at 1785 rpm fan speed, intake 45.21 C and exhaust 51.28 C. The fan ran at 593 rpm at 10% load in this sample.

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.

0.0408W7Measurementcybenetics.com/evaluations/psus/2669Read 15 October 2026Standby power consumption at 115V with no load on +5VSB. At 230V it is 0.0982 W.

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.

16.3ms7Measurementcybenetics.com/evaluations/psus/2669Read 15 October 2026Hold-Up Time and PWR_OK Signal: hold-up time 16.3 ms, AC loss to PWR_OK 13.7 ms, at maximum continuous load. Report 2669.

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.

39.29mV7Measurementcybenetics.com/evaluations/psus/2669Read 15 October 2026Non-accredited. 12V ripple at full load at 115V. At 230V it is 37.95 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.

0.51%7Measurementcybenetics.com/evaluations/psus/2669Read 15 October 2026Non-accredited. 12V load regulation at 115V. At 230V it is 0.53%.

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

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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.

AASRock Steel Legend SL-750G

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

Source4Retailer pagemultitronic.fi/en/products/4417379/asrock-steel-legend-sl-750g-750w---nataggregat--80-plus-goldRead 15 October 2026The gallery image SL-1000G-10 is ASRock's Cables Included slide: 1x MB 24 pin 600 mm, 2x CPU 4+4 pin 650 mm, 1x PCIe 12V-2x6 650 mm, 2x PCIe 6+2 pin 600 mm, 3x SATA 450 mm then 120 mm then 120 mm, 1x PATA 450 mm then 120 mm then 120 mm. The slide counts cables. Cybenetics shows that one of the two PCIe cables carries two plugs, so the unit has 3 PCIe 8-pin plugs on 2 cables. Retailer copies of ASRock's spec table print 2 for PCIe 6+2 pin (cables) and 3 for the plug total. SATA is 9 plugs on 3 cables and Molex is 3 plugs on 1 cable.7Measurementcybenetics.com/evaluations/psus/2669Read 15 October 2026Cables and Connectors table: ATX 600 mm 18AWG, EPS 4+4 700 mm 18AWG (2 cables), 6+2 PCIe 590 mm plus 140 mm on one cable with two plugs plus one single 590 mm cable (3 plugs, all 18AWG), 12+4 pin PCIe 640 mm (600W) 16-28AWG, SATA 450 mm then 120 mm then 120 mm on 3 cables (9 plugs), 4-pin Molex 440 mm then 110 mm then 110 mm on 1 cable (3 plugs). The stored lengths are the maker's lengths from ASRock's Cables Included slide, which shows 650 mm for the EPS cables and 650 mm for the 12V-2x6 cable. The 16-28AWG range of the 12V-2x6 cable includes the thin sideband wires, so the 16AWG power wire gauge is stored.

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.

3=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

9=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.

Flat3Retailer pageinside-tech.co.uk/power-supplies-2/asrock-steel-legend-sl-750g-750w-atx-power-supply-unit-80-plus-gold-certified-120mm-silent-cooling-fan-high-efficiency-psuRead 15 October 2026Spec table row Cable Type: Flat.

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

2 of 4 differ

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

135mm3Retailer pageinside-tech.co.uk/power-supplies-2/asrock-steel-legend-sl-750g-750w-atx-power-supply-unit-80-plus-gold-certified-120mm-silent-cooling-fan-high-efficiency-psuRead 15 October 2026Spec table row Fan: 135mm Striped Axial FDB Fan.7Measurementcybenetics.com/evaluations/psus/2669Read 15 October 2026DUT Information: 135mm Fluid Dynamic Bearing Fan, model RL4ZS1352512HH.

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)3Retailer pageinside-tech.co.uk/power-supplies-2/asrock-steel-legend-sl-750g-750w-atx-power-supply-unit-80-plus-gold-certified-120mm-silent-cooling-fan-high-efficiency-psuRead 15 October 2026Spec table row Fan: 135mm Striped Axial FDB Fan. The description says 135mm Fluid Dynamic Bearing Fan.7Measurementcybenetics.com/evaluations/psus/2669Read 15 October 2026DUT Information: 135mm 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-passive2Owner's manualdownload.asrock.com/Manual/QIG/Power%20Supply%20Series_multiQIG.pdfRead 15 October 2026Installation step 8: if the iCOOL mode is set to ON, the fan will not spin during low to medium loads.7Measurementcybenetics.com/evaluations/psus/2669Read 15 October 2026DUT Information: Semi-Passive Operation checked (selectable). The tested sample spun at 593 rpm already at 10% load, so its semi-passive mode was off during the test.

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.

Yes2Owner's manualdownload.asrock.com/Manual/QIG/Power%20Supply%20Series_multiQIG.pdfRead 15 October 2026Installation step 8 describes the iCOOL mode as a setting that can be ON, so the fan can be made to spin at low load. The Inside Tech copy of ASRock's spec table lists iCOOL MODE as a switch.3Retailer pageinside-tech.co.uk/power-supplies-2/asrock-steel-legend-sl-750g-750w-atx-power-supply-unit-80-plus-gold-certified-120mm-silent-cooling-fan-high-efficiency-psuRead 15 October 2026Spec table row iCOOL MODE: Yes (Switch). iCOOL Mode OFF: the fan runs continuously.7Measurementcybenetics.com/evaluations/psus/2669Read 15 October 2026DUT Information: Semi-Passive Operation (selectable).

Not available

Protection and parts

0 of 3 differ

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

Over-current (OCP), Over-voltage (OVP), Under-voltage (UVP), Over-power (OPP), Over-temperature (OTP), Short-circuit (SCP), No-load (NLO), Surge and inrush (SIP)3Retailer pageinside-tech.co.uk/power-supplies-2/asrock-steel-legend-sl-750g-750w-atx-power-supply-unit-80-plus-gold-certified-120mm-silent-cooling-fan-high-efficiency-psuRead 15 October 2026Spec table row Protections: OCP, SCP, OVP, UVP, OTP, OPP. NLO and SIP come from the Cybenetics protection tests.7Measurementcybenetics.com/evaluations/psus/2669Read 15 October 2026Protection Features (Manufacturer) lists OPP, OCP (+12V), OTP, SCP, surge protection and inrush current protection. Fan failure protection is not ticked. The protection tests tick NLO and show SIP: surge MOV, inrush NTC and bypass relay.

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.

Yes3Retailer pageinside-tech.co.uk/power-supplies-2/asrock-steel-legend-sl-750g-750w-atx-power-supply-unit-80-plus-gold-certified-120mm-silent-cooling-fan-high-efficiency-psuRead 15 October 2026Spec table row Capacitors: All Japanese.4Retailer pagemultitronic.fi/en/products/4417379/asrock-steel-legend-sl-750g-750w---nataggregat--80-plus-goldRead 15 October 2026Box image: 100% Japanese Capacitors badge.

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.

100,000h3Retailer pageinside-tech.co.uk/power-supplies-2/asrock-steel-legend-sl-750g-750w-atx-power-supply-unit-80-plus-gold-certified-120mm-silent-cooling-fan-high-efficiency-psuRead 15 October 2026Spec table row MTBF (Hours)@25C: 100,000. The 25 C test temperature is the maker's.

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

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.

Width150Height86Depth150mm(5.9 × 3.4 × 5.9 in)3Retailer pageinside-tech.co.uk/power-supplies-2/asrock-steel-legend-sl-750g-750w-atx-power-supply-unit-80-plus-gold-certified-120mm-silent-cooling-fan-high-efficiency-psuRead 15 October 2026Spec table row Dimensions (L x W x H): 150mm x 150mm x 86mm. Depth 150, width 150, height 86.

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.

Not available

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.asrock.com/Power-Supply/SteelLegend/SL-750G/index.asp1Maker product pageasrock.com/Power-Supply/SteelLegend/SL-750G/index.aspRead 15 October 2026ASRock's product page answers agents with a bot check, so its text was not read. The link is the page that search results name for the SL-750G. The specs below come from a retailer copy of ASRock's spec table, ASRock's box and cable images hosted by a retailer, ASRock's installation guide, the Cybenetics report and the 80 PLUS list.

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

download.asrock.com/Manual/QIG/Power%20Supply%20Series_multiQIG.pdf2Owner's manualdownload.asrock.com/Manual/QIG/Power%20Supply%20Series_multiQIG.pdfRead 15 October 2026ASRock's Quick Installation Guide for its power supply series. It is shared by all ASRock power supply series and names no model values.

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.

10years3Retailer pageinside-tech.co.uk/power-supplies-2/asrock-steel-legend-sl-750g-750w-atx-power-supply-unit-80-plus-gold-certified-120mm-silent-cooling-fan-high-efficiency-psuRead 15 October 2026Spec table row Warranty (Years): 10. Text: ASRock offers a 10-year warranty. The market is not named. Multitronic prints 3 years, which is not the maker's term.4Retailer pagemultitronic.fi/en/products/4417379/asrock-steel-legend-sl-750g-750w---nataggregat--80-plus-goldRead 15 October 2026Box image badge: 10 year warranty. The listing's own Warranty row says 3 years, which is not the maker's term.

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.