PC parts / Power supplies
ASRockPower supply
Steel Legend SL-850G
- Power
- 850W
- Efficiency
- 80 PLUS Platinum
- Modular cables
- Fully modular
- ATX version
- ATX 3.1
50 of 66 fields known.
At a glance
PCIe 8-pin connectors
5
Higher than 84% of other power supplies.
Average noise
Lower than 77% of other power supplies. Lower is better.
General
- GTIN / EAN
- Not available
- Announced
- Not available
- Status
- Available3Retailer pageinside-tech.co.uk/power-supplies-2/asrock-steel-legend-sl-850g-850w-atx-power-supply-unit-80-plus-gold-certified-120mm-silent-cooling-fan-high-efficiency-psuRead 14 October 2026UK retailer listing shows the unit in stock in October 2026.6Retailer pagegeizhals.de/asrock-steel-legend-sl-g-atx-3-1-v184341.htmlRead 14 October 202621 offers listed.
- Predecessor
- Not available
- Successor
- Not available
- Launch price (US)
- Not available
- Launch price (EU)
- Not available
- Markets
- Not available
- Colours
- Steel Black, Steel White3Retailer pageinside-tech.co.uk/power-supplies-2/asrock-steel-legend-sl-850g-850w-atx-power-supply-unit-80-plus-gold-certified-120mm-silent-cooling-fan-high-efficiency-psuRead 14 October 2026ASRock's series text on the page: available in Steel Black and Steel White. SL-850G is the black model and SL-850GW the white model.4Reviewfunkykit.com/reviews/power-supplies/asrock-steel-legend-sl-850g-850w-power-supply-reviewRead 14 October 2026Page 2 quotes ASRock: the series is available in Steel Black and Steel White.
- Form factor
- ATX2Reviewkitguru.net/components/power-supplies/zardon/asrock-steel-legend-sl-850g-psu-reviewRead 14 October 2026Page 3 gives the 150 x 150 x 86 mm body of an ATX unit.7Measurementcybenetics.com/evaluations/psus/2548Read 14 October 2026DUT Information: Type ATX12V.
- PCIe CEM version
- PCIe 5.12Reviewkitguru.net/components/power-supplies/zardon/asrock-steel-legend-sl-850g-psu-reviewRead 14 October 2026Back of the retail box: Native Durable 105C PCIe CEM 5.1 12+4-pin Cable.
- Modular cables
- Fully modular2Reviewkitguru.net/components/power-supplies/zardon/asrock-steel-legend-sl-850g-psu-reviewRead 14 October 2026Overview: Fully Modular design.
- Built by (OEM)
- HEC2Reviewkitguru.net/components/power-supplies/zardon/asrock-steel-legend-sl-850g-psu-reviewRead 14 October 2026Page 4: this power supply is an OEM partner design from HEC.7Measurementcybenetics.com/evaluations/psus/2548Read 14 October 2026DUT Information and Parts Description: OEM/ODM HEC.
Power
- Rated continuous power
- 850W7Measurementcybenetics.com/evaluations/psus/2548Read 14 October 2026DUT Information: Rated Power 850 W. The Power Specifications table gives a total maximum power of 850 W.
- Full power rated up to
- Not available
- 12V rail design
- Single rail4Reviewfunkykit.com/reviews/power-supplies/asrock-steel-legend-sl-850g-850w-power-supply-reviewRead 14 October 2026Review text quotes ASRock: a powerful +12V single rail at 70.9A, up to 850W.7Measurementcybenetics.com/evaluations/psus/2548Read 14 October 2026Power Specifications table lists one +12V column, 70.9A.
- +3.3V and +5V combined power
- 120W2Reviewkitguru.net/components/power-supplies/zardon/asrock-steel-legend-sl-850g-psu-reviewRead 14 October 2026Page 3: +3.3V and +5V can each deliver 20A for a total of 120W. The retail box table lists 120W for the combined +3.3V and +5V power.
- +5V standby current
- 3A2Reviewkitguru.net/components/power-supplies/zardon/asrock-steel-legend-sl-850g-psu-reviewRead 14 October 2026Retail box DC output table: +5Vsb 3A, 15W.
Certifications
- Cybenetics efficiency at 115V
- Cybenetics Platinum7Measurementcybenetics.com/evaluations/psus/2548Read 14 October 2026Report 24PS2548A, certification ID 252548, tested and issued Aug 24, 2024. ETA Platinum at 115V (badge image). The report names the model SL-850G / SL-850GW and says the results apply to both the black and white models.
- Cybenetics efficiency at 230V
- Cybenetics Platinum7Measurementcybenetics.com/evaluations/psus/2548Read 14 October 2026ETA Platinum at 230V (badge image).
Measured
- Average efficiency at 115V (measured)
- 89.823%7Measurementcybenetics.com/evaluations/psus/2548Read 14 October 2026Average over more than 1450 load combinations at 115V. Ambient 28-32 C. Sample received Aug 9, 2024.
- Average efficiency at 230V (measured)
- 91.931%7Measurementcybenetics.com/evaluations/psus/2548Read 14 October 2026Average over more than 1450 load combinations at 230V.
- Light-load efficiency at 115V (measured)
- 70.773%7Measurementcybenetics.com/evaluations/psus/2548Read 14 October 2026Efficiency at 2% load at 115V. The unit is above 500 W, so the 2% load applies. At 230V it is 72.136%.
- Average power factor at 115V (measured)
- 0.9827Measurementcybenetics.com/evaluations/psus/2548Read 14 October 2026Average over more than 1450 load combinations at 115V. At 230V it is 0.944.
- Average noise at 115V (measured)
- 18.27dB(A)7Measurementcybenetics.com/evaluations/psus/2548Read 14 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 17.54 dBA.
- Noise at full load at 115V (measured)
- 39.5dB(A)7Measurementcybenetics.com/evaluations/psus/2548Read 14 October 2026Typical load tests at 115V, 100% load row: 39.5 dB(A) at 1679 rpm fan speed, ambient about 30 C.
- Standby power with no load at 115V (measured)
- 0.0556W7Measurementcybenetics.com/evaluations/psus/2548Read 14 October 2026Standby power consumption at 115V with no load on +5VSB. At 230V it is 0.1105 W.
- Hold-up time (measured)
- 18.2ms7Measurementcybenetics.com/evaluations/psus/2548Read 14 October 2026Hold-Up Time and PWR_OK Signal: hold-up time 18.2 ms, AC loss to PWR_OK 15.7 ms, at maximum continuous load. Report 2548.
- 12V ripple at full load (measured)
- 44.38mV7Measurementcybenetics.com/evaluations/psus/2548Read 14 October 2026Non-accredited. 12V ripple at full load at 115V. At 230V it is 46.46 mV.
- 12V load regulation (measured)
- 0.36%7Measurementcybenetics.com/evaluations/psus/2548Read 14 October 2026Non-accredited. 12V load regulation at 115V. At 230V it is 0.41%.
Cables and connectors
- Cables
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) 5 3 600 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 Source2Reviewkitguru.net/components/power-supplies/zardon/asrock-steel-legend-sl-850g-psu-reviewRead 14 October 2026Retail box Cables Included drawing: 1x MB 20+4 pin 600 mm, 2x CPU 4+4 pin 650 mm, 1x PCIe 12V-2x6 650 mm, 3x 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 box counts cables. The review photo of the cables and the Cybenetics table show that two of the three PCIe 6+2 cables carry two plugs each, so the unit has 5 PCIe 8-pin plugs on 3 cables. ASRock-derived spec lists print 3 for PCIe 6+2 pin connectors, which counts the cables. SATA is 9 plugs on 3 cables and the Molex row is 3 plugs on 1 cable, as in the ASRock spec list. Cybenetics prints 16-24AWG for the 12V-2x6 cable. That range includes the thin sideband wires, so the 16AWG power wire gauge is stored.4Reviewfunkykit.com/reviews/power-supplies/asrock-steel-legend-sl-850g-850w-power-supply-reviewRead 14 October 2026Page 3 lists 1 ATX 24-pin, 2 CPU 8-pin (4+4), 3 PCIe 8-pin (6+2) cables, 1 12VHPWR (12V-2x6) cable rated up to 600W, 3 SATA cables and 1 PATA cable. Cable counts match the Cybenetics table.7Measurementcybenetics.com/evaluations/psus/2548Read 14 October 2026Cables and Connectors table: ATX 600 mm 18AWG, EPS 4+4 640 mm 18AWG (2 cables), 6+2 PCIe 590 mm plus 140 mm on two cables with two plugs each plus one single 590 mm cable (5 plugs, all 18AWG), 12+4 pin PCIe 645 mm (600W) 16-24AWG, 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 the retail box. Cybenetics measured slightly shorter cables. The 16-24AWG range includes the thin sideband wires.- CPU (EPS) connectors
- 2
- PCIe 8-pin connectors
- 5
- 16-pin GPU connectors
- 1
- SATA power connectors
- 9
- 4-pin Molex connectors
- 3
- Cable style
- Flat2Reviewkitguru.net/components/power-supplies/zardon/asrock-steel-legend-sl-850g-psu-reviewRead 14 October 2026Page 2: ASRock are using thin ribbon style cables.4Reviewfunkykit.com/reviews/power-supplies/asrock-steel-legend-sl-850g-850w-power-supply-reviewRead 14 October 2026Page 1: a full set of flat modular cables.
Fan
- Fan size
- 135mm2Reviewkitguru.net/components/power-supplies/zardon/asrock-steel-legend-sl-850g-psu-reviewRead 14 October 2026Page 4: 135 mm fan, model S1352512EH-3M.7Measurementcybenetics.com/evaluations/psus/2548Read 14 October 2026Parts Description: RL4Z S1352512EH-3M, 135 mm, 12V, 0.50A.
- Fan bearing
- Fluid dynamic (FDB)2Reviewkitguru.net/components/power-supplies/zardon/asrock-steel-legend-sl-850g-psu-reviewRead 14 October 2026Page 4: high grade fluid dynamic bearing (FDB) fan.7Measurementcybenetics.com/evaluations/psus/2548Read 14 October 2026Parts Description: Fluid Dynamic Bearing Fan.
- Fan mode
- Semi-passive2Reviewkitguru.net/components/power-supplies/zardon/asrock-steel-legend-sl-850g-psu-reviewRead 14 October 2026Page 3: the iCool switch switches the fan off in lower demand situations, like the semi passive switches of other brands. Page 6: the fan remains off until higher loads are demanded.7Measurementcybenetics.com/evaluations/psus/2548Read 14 October 2026DUT Information: Semi-Passive Operation checked (selectable). The fan reads 0 rpm up to 40% load at both voltages.
- Fan mode switch
- Yes2Reviewkitguru.net/components/power-supplies/zardon/asrock-steel-legend-sl-850g-psu-reviewRead 14 October 2026Page 3: a switch labelled iCool on the power side of the unit.5Owner's manualmanua.ls/asrock/steel-legend-sl-850g/manualRead 14 October 2026Quick Installation Guide step 8: if the iCOOL mode is set to ON, the fan will not spin during low to medium loads. The PDF is hosted on manua.ls.7Measurementcybenetics.com/evaluations/psus/2548Read 14 October 2026DUT Information: Semi-Passive Operation (selectable).
Protection and parts
- Protections
- 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)2Reviewkitguru.net/components/power-supplies/zardon/asrock-steel-legend-sl-850g-psu-reviewRead 14 October 2026Page 4: SCP, OPP, OCP, OTP, OVP and UVP protections. The retail box lists OPP/OVP/UVP/SCP/OCP/OTP.7Measurementcybenetics.com/evaluations/psus/2548Read 14 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.
Monitoring and lighting
We could not find any of these 4 fields. Show them
- Software monitoring
- Not available
- Software
- Not available
- Built-in power display
- Not available
- RGB lighting
- Not available
Dimensions and weight
Front and side, drawn to scale.
- Dimensions
- Width150Height86Depth150mm(5.9 × 3.4 × 5.9 in)2Reviewkitguru.net/components/power-supplies/zardon/asrock-steel-legend-sl-850g-psu-reviewRead 14 October 2026Page 3: 150 mm x 150 mm x 86 mm (L x W x H). Depth 150, width 150, height 86.
- Weight
- Not available
In the box
- In the box
- Power Supply, AC Power Cord, Modular Cables, ATX Bridging Connector Plug, Mounting Screws, Cable Ties, Velcro Straps, Leaflet4Reviewfunkykit.com/reviews/power-supplies/asrock-steel-legend-sl-850g-850w-power-supply-reviewRead 14 October 2026Page 3: power supply, power cord for the wall, modular power cables, ATX bridging connector plug (detection tool), mounting screws, cable ties and velcro straps. KitGuru adds a leaflet.
Links
- Product page
- www.asrock.com/Power-Supply/SteelLegend/SL-850G1Maker product pageasrock.com/Power-Supply/SteelLegend/SL-850GRead 14 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-850G. The specs below come from a retailer copy of ASRock's spec table, the photographed retail box, reviews and the Cybenetics report.
- Spec sheet
- Not available
- Manual
- Not available
- EPREL registration number
- Not available
Warranty
- Manufacturer warranty (source market)
- 10years2Reviewkitguru.net/components/power-supplies/zardon/asrock-steel-legend-sl-850g-psu-reviewRead 14 October 2026Overview: Global 10 Years Warranty.3Retailer pageinside-tech.co.uk/power-supplies-2/asrock-steel-legend-sl-850g-850w-atx-power-supply-unit-80-plus-gold-certified-120mm-silent-cooling-fan-high-efficiency-psuRead 14 October 2026Spec table: Warranty (Years) 10. The market is not named.
Compare with
Pick a power supply to see both side by side. Differences are marked yellow.
Variants
Each variant lists only what differs from the specs above.
| Model number | Colours |
|---|---|
| SL-850G | Steel Black |
| SL-850GW | Steel White |
Sources
We read 8 sources for this power supply. The numbers match the markers in the sheet.
- Maker product pageasrock.com/Power-Supply/SteelLegend/SL-850G
- Owner's manualmanua.ls/asrock/steel-legend-sl-850g/manual
- Measurementcybenetics.com/evaluations/psus/2548
See a wrong value? Tell us and name the field.