Power supplies / Compare

ASRock Steel Legend SL-1000G vs Montech Century II 1050W

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Product A: ASRock

Steel Legend SL-1000G

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B

Product B: Montech

Century II 1050W

54 of 66 known

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Only differences

AASRock Steel Legend SL-1000G

BMontech Century II 1050W

General

5 of 12 differ

Series

Steel Legend3Retailer pageinside-tech.co.uk/power-supplies-2/asrock-steel-legend-sl-1000g-1000w-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.

Century II1Maker product pagemontechpc.com/century-ii-1050wRead 14 October 2026

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

SL-1000G, SL-1000GW5Reviewweekly.ascii.jp/elem/000/004/243/4243655Read 15 October 2026The review is of the SL-1000GW, the white model.7Measurementcybenetics.com/evaluations/psus/2542Read 15 October 2026The report names the model SL-1000G / SL-1000GW and says the results apply to both the black and white models.

Century II 1050W1Maker product pagemontechpc.com/century-ii-1050wRead 14 October 2026Specifications tab: Model Name Century II 1050W. The maker prints no part number.

GTIN / EAN

Not available

47105627433711Maker product pagemontechpc.com/century-ii-1050wRead 14 October 2026Specifications tab: EAN 4710562743371. A UK retailer's store data lists the same barcode for SKU CENTURY II 1050W.

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

Not available

15 April 20252Press articlefunkykit.com/news/montech-introduces-century-ii-power-supplyRead 14 October 2026Article dated 2025-04-15. It says the line is available on April 15, 2025 at 9 AM Eastern Time.

Status

Available3Retailer pageinside-tech.co.uk/power-supplies-2/asrock-steel-legend-sl-1000g-1000w-atx-power-supply-unit-80-plus-gold-certified-120mm-silent-cooling-fan-high-efficiency-psuRead 15 October 2026UK retailer listing shows the unit in stock in October 2026.4Retailer pagemultitronic.fi/en/products/4417376/asrock-steel-legend-sl-1000g-1000w--virtalahde--80-plus-goldRead 15 October 2026Listing shows 3 pieces at a remote stock and an estimated delivery in October 2026.

Available7Retailer pagemaxmybuild.com/power-supplies/montech-century-ii-1050wRead 14 October 2026Listing shows $109.90 at Amazon and Newegg, both in stock, updated 14 Oct 2026. The Amazon US listing (ASIN B0F3XRMZBM) ranks #18 in Computer Power Supplies.

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

$109.92Press articlefunkykit.com/news/montech-introduces-century-ii-power-supplyRead 14 October 2026Century II 1050 W: US$ 109.9. The 850 W is US$ 89.9 and the 1200 W is US$ 129.9. US price, no sales tax. KitGuru and Tom's Hardware print about $110.5Reviewhwbusters.com/psus/montech-century-ii-1050w-atx-v3-1-psu-reviewRead 14 October 2026Technical specifications: MSRP (excluding VAT) $110. Tom's Hardware also prints $110. The stored value is the maker's launch price from the Funkykit report.

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 Black, Steel White3Retailer pageinside-tech.co.uk/power-supplies-2/asrock-steel-legend-sl-1000g-1000w-atx-power-supply-unit-80-plus-gold-certified-120mm-silent-cooling-fan-high-efficiency-psuRead 15 October 2026ASRock's text on the page: available in Steel Black and Steel White. The listing is the black unit.

Metallic Silver1Maker product pagemontechpc.com/century-ii-1050wRead 14 October 2026Overview text: a metallic silver finish. The maker names no other colour. Tom's Hardware describes a half black and half silver body.

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-1000g-1000w-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/2542Read 15 October 2026DUT Information: Type ATX12V.

ATX1Maker product pagemontechpc.com/century-ii-1050wRead 14 October 2026Specifications tab: Form Factor ATX (140).3Measurementcybenetics.com/evaluations/psus/2812Read 14 October 2026DUT Information: Type ATX12V. The maker lists form factor ATX (140).

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-1000g-1000w-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/4417376/asrock-steel-legend-sl-1000g-1000w--virtalahde--80-plus-goldRead 15 October 2026Box image badge ATX 3.1 COMPATIBLE. Spec table ATX version 3.1.

ATX 3.11Maker product pagemontechpc.com/century-ii-1050wRead 14 October 2026Overview: built to ATX 3.1 and PCIe 5.1 platforms. The 80 PLUS certificate type line reads ATX 3.0, ATX 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/4417376/asrock-steel-legend-sl-1000g-1000w--virtalahde--80-plus-goldRead 15 October 2026The product gallery image SL-1000G-4 shows ASRock's retail box with the badges ATX 3.1 COMPATIBLE and PCIe 5.1 READY. The description says full compliance with ATX 3.1 and PCIe 5.1.

PCIe 5.11Maker product pagemontechpc.com/century-ii-1050wRead 14 October 2026Overview: built to ATX 3.1 and PCIe 5.1 platforms.

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

Fully modular4Retailer pagemultitronic.fi/en/products/4417376/asrock-steel-legend-sl-1000g-1000w--virtalahde--80-plus-goldRead 15 October 2026Spec table Cabling type: Fully-Modular.7Measurementcybenetics.com/evaluations/psus/2542Read 15 October 2026DUT Information: Cable Design Fully Modular.

Fully modular1Maker product pagemontechpc.com/century-ii-1050wRead 14 October 20263Measurementcybenetics.com/evaluations/psus/2812Read 14 October 2026DUT Information: Cable Design Fully Modular.

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/2542Read 15 October 2026DUT Information and Parts Description: OEM/ODM HEC.

Shenzhen Xinweiye Technology (XWY)3Measurementcybenetics.com/evaluations/psus/2812Read 14 October 2026DUT Information: OEM/ODM Shenzhen Xinweiye Technology Co., Ltd. Tom's Hardware calls the company XWY.5Reviewhwbusters.com/psus/montech-century-ii-1050w-atx-v3-1-psu-reviewRead 14 October 2026Technical specifications: Manufacturer (OEM) Shenzhen Xinweiye Technology.6Reviewtomshardware.com/pc-components/power-supplies/montech-century-ii-gold-1050w-atx-3-1-power-supply-reviewRead 14 October 2026Internal Design: the OEM is XWY (Shenzhen Xin Weiye Technology Co.).

Power

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

1,000W7Measurementcybenetics.com/evaluations/psus/2542Read 15 October 2026DUT Information: Rated Power 1000 W. The Power Specifications table gives a total maximum power of 1000 W.

1,050W1Maker product pagemontechpc.com/century-ii-1050wRead 14 October 20263Measurementcybenetics.com/evaluations/psus/2812Read 14 October 2026Manufacturer-provided information: Rated Power 1050 W.

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

Not available

Not available

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

Single rail7Measurementcybenetics.com/evaluations/psus/2542Read 15 October 2026Power Specifications table lists one +12V column, 83.4A.

Single rail3Measurementcybenetics.com/evaluations/psus/2812Read 14 October 2026Power Specifications: one +12V column with 87.5A and 1050W.5Reviewhwbusters.com/psus/montech-century-ii-1050w-atx-v3-1-psu-reviewRead 14 October 2026Technical specifications: Number of 12V rails 1.

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

83.4A7Measurementcybenetics.com/evaluations/psus/2542Read 15 October 2026Power Specifications table: +12V 83.4 A. The Inside Tech copy of ASRock's spec table prints Continuous 12V output 100 A, which would be 1200 W and does not fit a 1000 W unit, so 83.4 A is stored.

87.5A1Maker product pagemontechpc.com/century-ii-1050wRead 14 October 2026DC Output table: +12V 87.5A, 1050W.3Measurementcybenetics.com/evaluations/psus/2812Read 14 October 2026

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

1,000W7Measurementcybenetics.com/evaluations/psus/2542Read 15 October 2026Power Specifications table: +12V 1000 W, total maximum power 1000 W.

1,050W1Maker product pagemontechpc.com/century-ii-1050wRead 14 October 2026DC Output table: +12V 87.5A, 1050W.3Measurementcybenetics.com/evaluations/psus/2812Read 14 October 2026

+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/2542Read 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.

100W1Maker product pagemontechpc.com/century-ii-1050wRead 14 October 2026DC Output table prints +3.3V 20A and +5V 20A with one 100W cell and a blank cell. The Cybenetics power table has one merged 100W cell for 3.3V and 5V, so 100W is the combined limit. Tom's Hardware prints 120W, which no other source confirms.3Measurementcybenetics.com/evaluations/psus/2812Read 14 October 2026

+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/2542Read 15 October 2026Power Specifications table: +5VSB 3 A, 15 W.

3A1Maker product pagemontechpc.com/century-ii-1050wRead 14 October 2026DC Output table: +5VSB 3A, 15W.3Measurementcybenetics.com/evaluations/psus/2812Read 14 October 2026

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-1000g-1000w-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, 15-7.5A.7Measurementcybenetics.com/evaluations/psus/2542Read 15 October 2026DUT Information: Rated Voltage 100-240 Vrms, manufacturer-provided.

Lowest100Highest240V1Maker product pagemontechpc.com/century-ii-1050wRead 14 October 2026AC Input 100-240Vac 50-60Hz 15A-10A.3Measurementcybenetics.com/evaluations/psus/2812Read 14 October 2026Manufacturer-provided information: 100-240 Vrms, 10-15 A, 50-60 Hz.

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

Yes7Measurementcybenetics.com/evaluations/psus/2542Read 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.

Yes3Measurementcybenetics.com/evaluations/psus/2812Read 14 October 2026Temperature and Compliance Info: ALPM 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 Platinum8Certification listclearesult.com/80plus/sites/80plus/files/manufacturer-certificate/ASROCK_SL-1000G_1000W_SOCE%207598_Report_0.pdfRead 15 October 202680 PLUS list entry ID 7598, model SL-1000G, 1000W, 80 PLUS Platinum, tested 10/8/2024 at 115V nominal and 60 Hz (typical efficiency at 50% load 92.60%). ASRock's box and spec sheet claim 80 PLUS Gold, so the listing level is stored. The SL-1000GW has its own Platinum entry, ID 7598.1.

80 PLUS Gold4Certification listclearesult.com/80plus/sites/80plus/files/manufacturer-certificate/MONTECH_CENTURY%20II%201050W_1050W_SOCE%207851_Report.pdfRead 14 October 202680 PLUS ID 7851, model CENTURY II 1050W, type ATX 3.0, ATX 3.1, 1050 W, 115V Internal, Gold, test date 2025-06-04. The certificate lists no sample serial. The maker's own page says Platinum, which is the Cybenetics level.

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/2542Read 15 October 2026Report 24PS2542A, certification ID 252542, tested Aug 20, 2024 and issued Aug 24, 2024. ETA Platinum at 115V (badge image). ASRock's retailer copy says Cybenetics Platinum. Some Newegg listings print Titanium, which the report does not show.

Cybenetics Platinum3Measurementcybenetics.com/evaluations/psus/2812Read 14 October 2026Report 25PS2812A, certification ID 252812, issued May 13, 2025. The database name is Montech Century II Gold 1050 ATX3. The badge is ETA Platinum at 115V.

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/2542Read 15 October 2026ETA Platinum at 230V (badge image).

Cybenetics Platinum3Measurementcybenetics.com/evaluations/psus/2812Read 14 October 2026ETA Platinum at 230V.

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

A7Measurementcybenetics.com/evaluations/psus/2542Read 15 October 2026LAMBDA A at 115V (badge image). The measured average of 21.99 dBA fits A. ASRock's series text prints A+/A, so the report level is stored.

A-3Measurementcybenetics.com/evaluations/psus/2812Read 14 October 2026LAMBDA A- at 115V.

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

A7Measurementcybenetics.com/evaluations/psus/2542Read 15 October 2026LAMBDA A at 230V (badge image). The measured average at 230V is 22.25 dBA.

A-3Measurementcybenetics.com/evaluations/psus/2812Read 14 October 2026LAMBDA 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.

90.065%7Measurementcybenetics.com/evaluations/psus/2542Read 15 October 2026Average over more than 1450 load combinations at 115V. Ambient 28-32 C. Sample received Aug 9, 2024.

90.064%3Measurementcybenetics.com/evaluations/psus/2812Read 14 October 2026Average over more than 1450 load combinations at 115V. Tested May 10, 2025, received Apr 29, 2025, ambient 28-32 C. The report lists no sample serial.

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

92.186%7Measurementcybenetics.com/evaluations/psus/2542Read 15 October 2026Average over more than 1450 load combinations at 230V.

92.072%3Measurementcybenetics.com/evaluations/psus/2812Read 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.

72.897%7Measurementcybenetics.com/evaluations/psus/2542Read 15 October 2026Efficiency at 2% load at 115V. The unit is above 500 W, so the 2% load applies. At 230V it is 74.319%.

73.26%3Measurementcybenetics.com/evaluations/psus/2812Read 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.

0.987Measurementcybenetics.com/evaluations/psus/2542Read 15 October 2026Average over more than 1450 load combinations at 115V. At 230V it is 0.937.

0.993Measurementcybenetics.com/evaluations/psus/2812Read 14 October 2026Average over more than 1450 load combinations at 115V. At 230V it is 0.958.

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

21.99dB(A)7Measurementcybenetics.com/evaluations/psus/2542Read 15 October 2026Average over more than 1450 load combinations at 115V, ambient 28-32 C, Bruel and Kjaer 2270 G4 sound analyzer. The 230V average is 22.25 dBA.

28.5dB(A)3Measurementcybenetics.com/evaluations/psus/2812Read 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 28.09 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.

47dB(A)7Measurementcybenetics.com/evaluations/psus/2542Read 15 October 2026Typical load tests at 115V, 100% load row: 47 dB(A) at 2005 rpm fan speed, intake 45.79 C and exhaust 60.19 C. The fan was in its default semi-passive mode.

44.6dB(A)3Measurementcybenetics.com/evaluations/psus/2812Read 14 October 2026Typical load tests at 115V, 100% load row: 44.6 dB(A) at 1894 rpm fan speed, ambient about 30 C. At 230V it is 44.5 dB(A) at 1888 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.

0.048W7Measurementcybenetics.com/evaluations/psus/2542Read 15 October 2026Standby power consumption at 115V with no load on +5VSB. At 230V it is 0.1155 W.

0.0534W3Measurementcybenetics.com/evaluations/psus/2812Read 14 October 2026Standby power consumption at 115V with no load on +5VSB: 0.0534 W. At 230V it is 0.0998 W.

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

18.9ms7Measurementcybenetics.com/evaluations/psus/2542Read 15 October 2026Hold-Up Time and PWR_OK Signal: hold-up time 18.9 ms, AC loss to PWR_OK 16.5 ms, at maximum continuous load. Report 2542.

24.3ms3Measurementcybenetics.com/evaluations/psus/2812Read 14 October 2026Hold-Up Time and PWR_OK Signal: hold-up time 24.3 ms, AC loss to PWR_OK 21.2 ms, PWR_OK inactive to DC loss 3.1 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.

40.28mV7Measurementcybenetics.com/evaluations/psus/2542Read 15 October 2026Non-accredited. 12V ripple at full load at 115V. At 230V it is 37.08 mV.

22.04mV3Measurementcybenetics.com/evaluations/psus/2812Read 14 October 2026Non-accredited. 12V ripple at full load at 115V. At 230V it is 23.57 mV.

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

0.64%7Measurementcybenetics.com/evaluations/psus/2542Read 15 October 2026Non-accredited. 12V load regulation at 115V. At 230V it is 0.65%.

0.26%3Measurementcybenetics.com/evaluations/psus/2812Read 14 October 2026Non-accredited. 12V load regulation at 115V. At 230V it is 0.24%.

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-1000G

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

Source4Retailer pagemultitronic.fi/en/products/4417376/asrock-steel-legend-sl-1000g-1000w--virtalahde--80-plus-goldRead 15 October 2026The gallery image SL-1000G-1 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, 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 slide counts cables. Cybenetics and the ASCII review show that two of the three PCIe cables carry two plugs each, so the unit has 5 PCIe 8-pin plugs on 3 cables. SATA is 9 plugs on 3 cables and Molex is 3 plugs on 1 cable. The ASRock spec table on Inside Tech prints 2 for 12+4 pin, which Cybenetics, BuildCores, Geeknetic and ASCII do not show. One cable is stored.5Reviewweekly.ascii.jp/elem/000/004/243/4243655Read 15 October 2026Cables in the box: 1 ATX 20+4 pin, 2 EPS 4+4 pin, 1 12V-2x6 rated to 600 W, 3 PCIe 6+2 pin, 3 SATA cables with 9 SATA plugs and 1 peripheral cable with 3 plugs. The reviewer measured about 600 mm for the ATX cable, 650 mm for the EPS and 12V-2x6 cables and 600 mm for the PCIe cables.7Measurementcybenetics.com/evaluations/psus/2542Read 15 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 ASRock's Cables Included slide. The 16-24AWG range of the 12V-2x6 cable includes the thin sideband wires, so the 16AWG power wire gauge is stored. The sample is the same for the black and white models.

BMontech Century II 1050W

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	700	18AWG	Not available
PCIe 8-pin (6+2)	6	3	600	18AWG	Not available
12V-2x6	1	1	600	16AWG	600
SATA power	12	3	500	18AWG	Not available
4-pin Molex	4	1	500	18AWG	Not available

Source1Maker product pagemontechpc.com/century-ii-1050wRead 14 October 2026Cables table: 1 motherboard cable with a 20+4 pin plug, 2 CPU cables with one 4+4 pin plug, 3 PCIe cables with two 6+2 pin plugs, 1 12V-2x6 cable, 3 SATA cables with 4 plugs and 1 Molex cable with 4 plugs. Lengths and gauge come from the Cybenetics report.3Measurementcybenetics.com/evaluations/psus/2812Read 14 October 2026Cables and Connectors table: ATX 20+4 pin 600 mm 18AWG, 2 x 4+4 pin EPS 700 mm 18AWG, 3 PCIe cables with 6+2 pin plugs, 600 mm then 150 mm, 6 plugs in total, 18AWG, 12+4 pin PCIe 600 mm (600W) 16-26AWG, 3 SATA cables of 500 mm plus 3 x 150 mm spacing with 12 plugs in total, 18AWG, 1 Molex cable 500 mm plus 3 x 150 mm with 4 plugs, 18AWG. The 16-26AWG range of the 12V-2x6 cable includes the thin sideband wires, so the stored gauge is the 16AWG power wire.

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.

5=CalculatedFrom Cables

6=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

12=CalculatedFrom Cables

4-pin Molex connectors

3=CalculatedFrom Cables

4=CalculatedFrom Cables

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

Flat3Retailer pageinside-tech.co.uk/power-supplies-2/asrock-steel-legend-sl-1000g-1000w-atx-power-supply-unit-80-plus-gold-certified-120mm-silent-cooling-fan-high-efficiency-psuRead 15 October 2026Spec table row Cable Type: Flat.5Reviewweekly.ascii.jp/elem/000/004/243/4243655Read 15 October 2026The modular cables are the flat type.

Flat1Maker product pagemontechpc.com/century-ii-1050wRead 14 October 2026Overview: flat cables and a fully modular design.5Reviewhwbusters.com/psus/montech-century-ii-1050w-atx-v3-1-psu-reviewRead 14 October 2026Cables page: all cables are flat and consist of black gauges. Review published May 31, 2025.

Fan

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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-1000g-1000w-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/2542Read 15 October 2026Parts Description: RLAZ S1352512EH-3M, 135 mm, 12V, 0.50A.

135mm1Maker product pagemontechpc.com/century-ii-1050wRead 14 October 2026Specifications tab: Fan Size 135mm.3Measurementcybenetics.com/evaluations/psus/2812Read 14 October 2026DUT Information: 135mm Fluid Dynamic Bearing Fan.

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-1000g-1000w-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/2542Read 15 October 2026Parts Description: Fluid Dynamic Bearing Fan.

Fluid dynamic (FDB)1Maker product pagemontechpc.com/century-ii-1050wRead 14 October 2026Specifications tab: Bearing FDB.3Measurementcybenetics.com/evaluations/psus/2812Read 14 October 2026DUT Information: 135mm Fluid Dynamic Bearing Fan (HA13525H12F-Z).

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-passive1Owner'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.5Reviewweekly.ascii.jp/elem/000/004/243/4243655Read 15 October 2026The iCool Intelligent Fan Control Mode stops the fan at idle. ASRock says the fan stops below 40% load. With the mode off the fan keeps about 12% speed at idle.7Measurementcybenetics.com/evaluations/psus/2542Read 15 October 2026DUT Information: Semi-Passive Operation checked (selectable). In the typical load tests the fan reads 0 rpm up to 40% load at 115V.

Semi-passive1Maker product pagemontechpc.com/century-ii-1050wRead 14 October 2026Overview: 135mm FDB fan with Smart Zero Fan mode.3Measurementcybenetics.com/evaluations/psus/2812Read 14 October 2026DUT Information: Semi-Passive Operation checked (selectable). The 10% load row shows 0 rpm at 115V.

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.

Yes1Owner'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 switch itself is on the back of the unit, as the ASCII review shows.3Retailer pageinside-tech.co.uk/power-supplies-2/asrock-steel-legend-sl-1000g-1000w-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.5Reviewweekly.ascii.jp/elem/000/004/243/4243655Read 15 October 2026The mode is switched with a rocker switch on the back of the unit.7Measurementcybenetics.com/evaluations/psus/2542Read 15 October 2026DUT Information: Semi-Passive Operation (selectable).

Yes3Measurementcybenetics.com/evaluations/psus/2812Read 14 October 2026DUT Information: Semi-Passive Operation marked selectable.5Reviewhwbusters.com/psus/montech-century-ii-1050w-atx-v3-1-psu-reviewRead 14 October 2026Product photos page: on the front, besides the power switch, a smaller switch enables or disables the fan's semi-passive operation.6Reviewtomshardware.com/pc-components/power-supplies/montech-century-ii-gold-1050w-atx-3-1-power-supply-reviewRead 14 October 2026External Appearance: the front has a button to toggle the hybrid fan mode.

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)3Retailer pageinside-tech.co.uk/power-supplies-2/asrock-steel-legend-sl-1000g-1000w-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/2542Read 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)1Maker product pagemontechpc.com/century-ii-1050wRead 14 October 2026Specifications tab: OPP / OVP / UVP / SCP / OCP / OTP.3Measurementcybenetics.com/evaluations/psus/2812Read 14 October 2026Protection Features (Manufacturer) lists OPP, +12V OCP, OTP, SCP, surge and inrush current protection. Protection tests tick UVP at 90 V and 80 V and NLO, and SIP shows an MOV for surge and an NTC with bypass relay for inrush. The maker lists OVP, which the report does not test.

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-1000g-1000w-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/4417376/asrock-steel-legend-sl-1000g-1000w--virtalahde--80-plus-goldRead 15 October 2026Box image: 100% Japanese Capacitors badge. The description says the PSU is built with 100% Japanese capacitors.

Yes1Maker product pagemontechpc.com/century-ii-1050wRead 14 October 2026Overview: 100% Japanese capacitors.6Reviewtomshardware.com/pc-components/power-supplies/montech-century-ii-gold-1050w-atx-3-1-power-supply-reviewRead 14 October 2026Internal Design: capacitors are a mix of Nippon Chemi-Con, Rubycon and Toshin Kogyo, all Japanese makers.

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-1000g-1000w-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.

Not available

Monitoring and lighting

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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

No7Retailer pagemaxmybuild.com/power-supplies/montech-century-ii-1050wRead 14 October 2026Listing specs: no RGB. Tom's Hardware, Hardware Busters and the maker page describe no lighting.

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-1000g-1000w-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 86.5Reviewweekly.ascii.jp/elem/000/004/243/4243655Read 15 October 2026Measured by the reviewer at 150 x 150 x 86 mm (W x D x H).

Width150Height86Depth140mm(5.9 × 3.4 × 5.5 in)1Maker product pagemontechpc.com/century-ii-1050wRead 14 October 2026Specifications tab: Dimensions (L*W*H) 140*150*86mm, so depth 140, width 150, height 86. The page also prints Operating Temperature 0-40 C, which is not stored. Tom's Hardware prints its power table as Rated @ 50 C and Hardware Busters prints 0-50 C.

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.

1.748kg(3.9 lb)5Reviewweekly.ascii.jp/elem/000/004/243/4243655Read 15 October 2026Reviewer's measured weight of the white SL-1000GW body: about 1748 g, given next to the 150 x 150 x 86 mm size. The cables are described separately. The black SL-1000G has the same hardware.

1.49kg(3.3 lb)5Reviewhwbusters.com/psus/montech-century-ii-1050w-atx-v3-1-psu-reviewRead 14 October 2026Technical specifications: 1.49 kg (3.28 lb). The review does not say whether cables are included. Montech does not publish a weight. Best Buy's 104 oz and a Cyprus retailer's 3.9 kg are packed weights and are not stored.

In the box

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

Not available

AC power cable, Mounting screws, Cable ties, Cable straps6Reviewtomshardware.com/pc-components/power-supplies/montech-century-ii-gold-1050w-atx-3-1-power-supply-reviewRead 14 October 2026In the Box: mounting screws, an AC power cable, a few cable ties and several cable straps. The review was published on 3 May 2025.

Links

Not compared

Product page

www.asrock.com/Power-Supply/SteelLegend/SL-1000G2Maker product pageasrock.com/Power-Supply/SteelLegend/SL-1000GRead 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-1000G. The specs below come from a retailer copy of ASRock's spec table, ASRock's box and cable images hosted by a retailer, a review, the Cybenetics report and the 80 PLUS list.

www.montechpc.com/century-ii-1050w1Maker product pagemontechpc.com/century-ii-1050wRead 14 October 2026

Spec sheet

Not available

Not available

Manual

download.asrock.com/Manual/QIG/Power%20Supply%20Series_multiQIG.pdf1Owner'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.

Not available

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

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

10years3Retailer pageinside-tech.co.uk/power-supplies-2/asrock-steel-legend-sl-1000g-1000w-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/4417376/asrock-steel-legend-sl-1000g-1000w--virtalahde--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 pagemontechpc.com/century-ii-1050wRead 14 October 2026Specifications tab: Warranty 10 Years. The page is the global maker page and names no market.

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