Power supplies / Compare

CORSAIR HX1500i (2025) vs Montech Century II 850W

A

Product A: CORSAIR

HX1500i (2025)

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B

Product B: Montech

Century II 850W

54 of 66 known

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Only differences

ACORSAIR HX1500i (2025)

BMontech Century II 850W

General

4 of 12 differ

Series

HXi1Maker product pagecorsair.com/us/en/p/psu/cp-9020309-na/hx1500i-fully-modular-ultra-low-noise-platinum-atx-1500-watt-pc-power-supply-cp-9020309-naRead 14 October 2026

Century II1Maker product pagemontechpc.com/century-ii-850wRead 14 October 2026

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

CP-9020309-NA1Maker product pagecorsair.com/us/en/p/psu/cp-9020309-na/hx1500i-fully-modular-ultra-low-noise-platinum-atx-1500-watt-pc-power-supply-cp-9020309-naRead 14 October 2026SKU CP-9020309-NA. The EU and UK units are CP-9020309-EU and CP-9020309-UK. Corsair's manual lists a 200-240V model (part no. 75-005685) next to the 100-240V model (75-005686), so the regional units may differ in AC input. Only the NA unit is stored, since AC input is not a variant field.

Century II 850W1Maker product pagemontechpc.com/century-ii-850wRead 14 October 2026Specifications tab: Model Name Century II 850W. The maker prints no part number.

GTIN / EAN

8404404959015Spec databasebuildcores.com/products/PSU/itehnrob3/Corsair-HX1500i-(2025)-Black-1500W-Fully-Modular-80%2B-PlatinumRead 14 October 2026BuildCores lists UPC 840440495901 for CP-9020309-NA, and so does an Amazon price tracker. BuildCores also lists EAN 0840440495949, which is left out because two codes for one unit could not be checked against the box. The same entry lists the EU, UK, AU and WW part numbers.

47105627472631Maker product pagemontechpc.com/century-ii-850wRead 14 October 2026Specifications tab: EAN 4710562747263.

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

15 April 20253Press releasecorsair.com/newsroom/press-release/corsair-launches-upgraded-hxi-series-psus-with-enhanced-cables-and-dual-color-12v-2x6-gpu-connectorsRead 14 October 2026Press release dated April 15, 2025.

15 April 20252Press releasemontechpc.com/news-century-iiRead 14 October 2026Launch article dated 2025-04-15. The unit is available from that day (see the Funkykit launch report).

Status

Available1Maker product pagecorsair.com/us/en/p/psu/cp-9020309-na/hx1500i-fully-modular-ultra-low-noise-platinum-atx-1500-watt-pc-power-supply-cp-9020309-naRead 14 October 2026Page shows In Stock at $349.99 with an original price of $389.99.

Available8Retailer pagemaxmybuild.com/power-supplies/montech-century-ii-850wRead 14 October 2026Listing shows $89.90 at Amazon and Newegg, updated 14 Oct 2026. Scan UK lists only an open-box unit and calls the model end of life. Tom's Hardware, in its review of 7 September 2026, lists it at Amazon, Newegg and Best Buy.

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

$89.92Press releasemontechpc.com/news-century-iiRead 14 October 2026Article: Starting at just $89.9. Funkykit lists the 850W model at US$ 89.9, the lowest of the three launch models. US price, no sales tax.3Press articlefunkykit.com/news/montech-introduces-century-ii-power-supplyRead 14 October 2026Century II 850 W: US$ 89.9. The 1050 W is US$ 109.9 and the 1200 W is US$ 129.9.

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

Not available

Metallic Silver1Maker product pagemontechpc.com/century-ii-850wRead 14 October 2026Overview text: a sleek metallic silver finish. The maker names no other colour for this wattage.

Form factoriThe physical size standard that decides what fits in the case. An ATX unit is 150 × 86 mm at the back. An SFX unit is 125 × 63.5 mm.

ATX1Maker product pagecorsair.com/us/en/p/psu/cp-9020309-na/hx1500i-fully-modular-ultra-low-noise-platinum-atx-1500-watt-pc-power-supply-cp-9020309-naRead 14 October 2026Tech Specs: PSU Form Factor ATX. The unit is 200 mm long.

ATX1Maker product pagemontechpc.com/century-ii-850wRead 14 October 2026Specifications tab: Form Factor ATX (140).5Measurementcybenetics.com/evaluations/psus/2813Read 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 3.11Maker product pagecorsair.com/us/en/p/psu/cp-9020309-na/hx1500i-fully-modular-ultra-low-noise-platinum-atx-1500-watt-pc-power-supply-cp-9020309-naRead 14 October 2026Tech Specs: ATX12V Version 3.1. Overview: Intel ATX 3.1 certified, PCIe 5.1 compatible.

ATX 3.11Maker product pagemontechpc.com/century-ii-850wRead 14 October 2026Overview: ATX 3.1 and PCIe 5.1 platform support. 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 5.11Maker product pagecorsair.com/us/en/p/psu/cp-9020309-na/hx1500i-fully-modular-ultra-low-noise-platinum-atx-1500-watt-pc-power-supply-cp-9020309-naRead 14 October 2026Overview: PCIe 5.1 compatible. Two PCIe 5.1 12V-2x6 GPU power cables.

PCIe 5.11Maker product pagemontechpc.com/century-ii-850wRead 14 October 2026Overview: ATX 3.1 and PCIe 5.1 platform support.

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

Fully modular1Maker product pagecorsair.com/us/en/p/psu/cp-9020309-na/hx1500i-fully-modular-ultra-low-noise-platinum-atx-1500-watt-pc-power-supply-cp-9020309-naRead 14 October 2026Tech Specs: Modular Fully.

Fully modular1Maker product pagemontechpc.com/century-ii-850wRead 14 October 20265Measurementcybenetics.com/evaluations/psus/2813Read 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.

Channel Well Technology (CWT)6Reviewkitguru.net/components/power-supplies/zardon/corsair-hx1500i-gen-4-2025-power-supply-review/all/1Read 14 October 2026Review dated June 4, 2025: Corsair works with Channel Well Technology (CWT) as the OEM of the new 1200W and 1500W units. Tom's Hardware also names CWT.7Reviewtomshardware.com/pc-components/power-supplies/corsair-hx1500i-2025-atx-3-1-power-supply-reviewRead 14 October 2026Channel-Well Technology (CWT) serves as the manufacturing partner. Review published 9 September 2025.

Shenzhen Xinweiye Technology (XWY)5Measurementcybenetics.com/evaluations/psus/2813Read 14 October 2026DUT Information: OEM/ODM Shenzhen Xinweiye Technology Co., Ltd. Tom's Hardware calls the company XWY.7Reviewtomshardware.com/pc-components/power-supplies/montech-century-ii-gold-850w-atx-3-1-power-supply-reviewRead 14 October 2026Internal Design: the OEM is Shenzhen Xinweiye Technology Co., typically referred to as XWY.

Power

7 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.

1,500W1Maker product pagecorsair.com/us/en/p/psu/cp-9020309-na/hx1500i-fully-modular-ultra-low-noise-platinum-atx-1500-watt-pc-power-supply-cp-9020309-naRead 14 October 2026Tech Specs: Continuous Power 1500 Watts. The power table gives total power 1500W at 115V-240V and 1200W at 100V-115V.

850W1Maker product pagemontechpc.com/century-ii-850wRead 14 October 20265Measurementcybenetics.com/evaluations/psus/2813Read 14 October 2026Manufacturer-provided information: Rated Power 850 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.

50°C1Maker product pagecorsair.com/us/en/p/psu/cp-9020309-na/hx1500i-fully-modular-ultra-low-noise-platinum-atx-1500-watt-pc-power-supply-cp-9020309-naRead 14 October 2026Tech Specs: Continuous Output Rated Temp 50 C.

40°C1Maker product pagemontechpc.com/century-ii-850wRead 14 October 2026Specifications tab: Operating Temperature 0-40 C. Tom's Hardware prints the power table as Rated @ 40 C. The Cybenetics report leaves its continuous full load temperature row empty.7Reviewtomshardware.com/pc-components/power-supplies/montech-century-ii-gold-850w-atx-3-1-power-supply-reviewRead 14 October 2026Power specifications table titled Rated @ 40 C. Same figure as the maker's operating 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.

Switchable1Maker product pagecorsair.com/us/en/p/psu/cp-9020309-na/hx1500i-fully-modular-ultra-low-noise-platinum-atx-1500-watt-pc-power-supply-cp-9020309-naRead 14 October 2026Tech Specs: Single Multiple 12V Rail Toggle Yes. iCUE switches between single rail OCP and multi rail OCP.2Owner's manualcorsair.com/us/en/explorer/diy-builder/power-supply-units/corsair-hxi-series-2025Read 14 October 2026iCUE setup: Toggle between Single Rail OCP and Multi-Rail OCP under PSU Mode.

Single rail5Measurementcybenetics.com/evaluations/psus/2813Read 14 October 2026Power Specifications: one +12V column with 70.8A and 849.6W, and one OCP result for 12V.

+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.

125A1Maker product pagecorsair.com/us/en/p/psu/cp-9020309-na/hx1500i-fully-modular-ultra-low-noise-platinum-atx-1500-watt-pc-power-supply-cp-9020309-naRead 14 October 2026Power table: +12V 125A, 1500W.2Owner's manualcorsair.com/us/en/explorer/diy-builder/power-supply-units/corsair-hxi-series-2025Read 14 October 2026HX1500i 2025 power table: model RPS0132, +12V 125A, 1500W.

70.8A1Maker product pagemontechpc.com/century-ii-850wRead 14 October 2026DC Output table: +12V 70.8A, 849.6W.5Measurementcybenetics.com/evaluations/psus/2813Read 14 October 2026

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

1,500W1Maker product pagecorsair.com/us/en/p/psu/cp-9020309-na/hx1500i-fully-modular-ultra-low-noise-platinum-atx-1500-watt-pc-power-supply-cp-9020309-naRead 14 October 2026Power table: +12V 125A, 1500W.2Owner's manualcorsair.com/us/en/explorer/diy-builder/power-supply-units/corsair-hxi-series-2025Read 14 October 2026HX1500i 2025 power table: +12V 125A, 1500W.

849.6W1Maker product pagemontechpc.com/century-ii-850wRead 14 October 2026DC Output table: +12V 70.8A, 849.6W.5Measurementcybenetics.com/evaluations/psus/2813Read 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.

150W1Maker product pagecorsair.com/us/en/p/psu/cp-9020309-na/hx1500i-fully-modular-ultra-low-noise-platinum-atx-1500-watt-pc-power-supply-cp-9020309-naRead 14 October 2026Power table: +3.3V 25A and +5V 25A with one 150W cell. Tom's Hardware prints 20A and 100W for the same rows, which matches the HX1200i, so the maker value is stored.2Owner's manualcorsair.com/us/en/explorer/diy-builder/power-supply-units/corsair-hxi-series-2025Read 14 October 2026Power table: +3.3V 25A and +5V 25A, 150W.

100W1Maker product pagemontechpc.com/century-ii-850wRead 14 October 2026DC Output table prints +3.3V 20A 100W and +5V 20A 100W. The Cybenetics power table has one merged 100W cell for 3.3V and 5V, so 100W is the combined limit.5Measurementcybenetics.com/evaluations/psus/2813Read 14 October 2026

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

3.5A1Maker product pagecorsair.com/us/en/p/psu/cp-9020309-na/hx1500i-fully-modular-ultra-low-noise-platinum-atx-1500-watt-pc-power-supply-cp-9020309-naRead 14 October 2026Power table: +5VSB 3.5A, 17.5W.2Owner's manualcorsair.com/us/en/explorer/diy-builder/power-supply-units/corsair-hxi-series-2025Read 14 October 2026Power table: +5Vsb 3.5A, 17.5W.

3A1Maker product pagemontechpc.com/century-ii-850wRead 14 October 2026DC Output table: +5VSB 3A, 15W.5Measurementcybenetics.com/evaluations/psus/2813Read 14 October 2026

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

Lowest100Highest240V1Maker product pagecorsair.com/us/en/p/psu/cp-9020309-na/hx1500i-fully-modular-ultra-low-noise-platinum-atx-1500-watt-pc-power-supply-cp-9020309-naRead 14 October 2026Power table: AC input 100-240V, 15A-9A, 47-63Hz.2Owner's manualcorsair.com/us/en/explorer/diy-builder/power-supply-units/corsair-hxi-series-2025Read 14 October 2026Power table: part no. 75-005686 is 100V-240V a.c., 15A-9A. Part no. 75-005685 is 200V-240V a.c., 10A.

Lowest100Highest240V1Maker product pagemontechpc.com/century-ii-850wRead 14 October 2026AC Input 100-240 VAC, 50-60 Hz, 10 A max.5Measurementcybenetics.com/evaluations/psus/2813Read 14 October 2026Manufacturer-provided information: 100-240 Vrms, 10 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.

Yes3Press releasecorsair.com/newsroom/press-release/corsair-launches-upgraded-hxi-series-psus-with-enhanced-cables-and-dual-color-12v-2x6-gpu-connectorsRead 14 October 2026Modern Standby compatible for extremely fast wake-from-sleep times. Modern Standby uses the ATX alternative low power mode.

Yes5Measurementcybenetics.com/evaluations/psus/2813Read 14 October 2026Temperature and Compliance Info: ALPM compatible, checked.

Certifications

3 of 5 differ

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

80 PLUS Platinum1Maker product pagecorsair.com/us/en/p/psu/cp-9020309-na/hx1500i-fully-modular-ultra-low-noise-platinum-atx-1500-watt-pc-power-supply-cp-9020309-naRead 14 October 2026Tech Specs: 80 PLUS Efficiency Platinum. The 80 PLUS list agrees for model code RPS0132.4Certification listclearesult.com/80plus/sites/80plus/files/manufacturer-certificate/CORSAIR%20_RPS0132%20%28CP-9020261%29%20%28HX1500i%29_1500W_SOCE%206770_Report.pdfRead 14 October 202680 PLUS ID 6770, model RPS0132 (CP-9020261) (HX1500i): Platinum at 115V, test date 2022-02-03. A second listing, ID 11871, covers RPS0132 (CP-9020215). The list has no entry for CP-9020309. The 2025 manual gives the same model code RPS0132, so the match is by model code only.

80 PLUS Gold6Certification listclearesult.com/80plus/sites/80plus/files/manufacturer-certificate/MONTECH_CENTURY%20II%20850W_850W_SOCE%207850_Report.pdfRead 14 October 202680 PLUS ID 7850, model CENTURY II 850W: Gold at 115V, test date 2025-06-04. The certificate lists no sample serial. The maker's own product 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 Platinum1Maker product pagecorsair.com/us/en/p/psu/cp-9020309-na/hx1500i-fully-modular-ultra-low-noise-platinum-atx-1500-watt-pc-power-supply-cp-9020309-naRead 14 October 2026Tech Specs: Cybenetics Efficiency Platinum, with no input voltage. The Cybenetics database has no report for CP-9020309-NA. Its entry for the earlier HX1500i (ID 2099) also shows Platinum, but is not used for any value. The 230V level is left out.

Cybenetics Platinum5Measurementcybenetics.com/evaluations/psus/2813Read 14 October 2026Report 25PS2813A, certification ID 252813, issued May 13, 2025. The database name is Montech Century II Gold 850 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.

Not available

Cybenetics Platinum5Measurementcybenetics.com/evaluations/psus/2813Read 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.

A-1Maker product pagecorsair.com/us/en/p/psu/cp-9020309-na/hx1500i-fully-modular-ultra-low-noise-platinum-atx-1500-watt-pc-power-supply-cp-9020309-naRead 14 October 2026Tech Specs: Cybenetics Noise A-, with no input voltage. See the efficiency note. The 230V level is left out.

A-5Measurementcybenetics.com/evaluations/psus/2813Read 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.

Not available

A-5Measurementcybenetics.com/evaluations/psus/2813Read 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.

Not available

89.8%5Measurementcybenetics.com/evaluations/psus/2813Read 14 October 2026Average over more than 1450 load combinations at 115V. Tested May 10, 2025, ambient 28-32 C. The report lists no sample serial.

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

Not available

91.84%5Measurementcybenetics.com/evaluations/psus/2813Read 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.

Not available

70.357%5Measurementcybenetics.com/evaluations/psus/2813Read 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.

Not available

0.9855Measurementcybenetics.com/evaluations/psus/2813Read 14 October 2026Average over more than 1450 load combinations at 115V. At 230V it is 0.945.

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.

Not available

26.89dB(A)5Measurementcybenetics.com/evaluations/psus/2813Read 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 26.26 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.

Not available

42.1dB(A)5Measurementcybenetics.com/evaluations/psus/2813Read 14 October 2026Typical load tests at 115V, 100% load row: 42.1 dB(A) at 1698 rpm fan speed, ambient about 30 C.

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.

Not available

0.073W5Measurementcybenetics.com/evaluations/psus/2813Read 14 October 2026Standby power consumption at 115V with no load on +5VSB: 0.0730 W. At 230V it is 0.1474 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.

Not available

22.4ms5Measurementcybenetics.com/evaluations/psus/2813Read 14 October 2026Hold-Up Time and PWR_OK Signal: hold-up time 22.4 ms, AC loss to PWR_OK 14.3 ms, at maximum continuous load.

12V ripple at full load (measured)iPeak-to-peak ripple on the +12V rail at full load and 115V input. Lower is better.

Not available

28.25mV5Measurementcybenetics.com/evaluations/psus/2813Read 14 October 2026Non-accredited. 12V ripple at full load at 115V. At 230V it is 29.21 mV.

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

Not available

0.39%5Measurementcybenetics.com/evaluations/psus/2813Read 14 October 2026Non-accredited. 12V load regulation at 115V. At 230V it is 0.27%.

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.

ACORSAIR HX1500i (2025)

Connector	Connectors	Cables	Length to first plug (mm)	Rated power (W)
ATX 24-pin (20+4)	1	1	610	Not available
CPU 8-pin (EPS, 4+4)	2	2	750	Not available
PCIe 8-pin (6+2)	5	5	650	Not available
12V-2x6	2	2	650	600
SATA power	8	2	505	Not available
4-pin Molex	6	2	550	Not available
Other	1	1	525	Not available

Source1Maker product pagecorsair.com/us/en/p/psu/cp-9020309-na/hx1500i-fully-modular-ultra-low-noise-platinum-atx-1500-watt-pc-power-supply-cp-9020309-naRead 14 October 2026Cable listing: 1 ATX 24-pin 610 mm, 2 EPS 4+4 pin 750 mm, 2 cables 2x8-pin to 12V-2x6 650 mm, 5 PCIe 8-pin 650 mm, 2 SATA cables with 4 plugs (505 mm to the first plug, 115 mm spacing, 850 mm total), 2 PATA cables with 3 plugs (550 mm to the first plug, 100 mm spacing, 750 mm total), 1 USB Type-C to 10-1 pin cable 525 mm. All lengths have a tolerance of 10 mm, the USB cable 25 mm. The gallery graphic calls the 12V-2x6 cables 600W. Each 12V-2x6 cable plugs into two 8-pin sockets at the PSU. The unit has nine 8-pin CPU/PCIe sockets, so not every EPS, PCIe and 12V-2x6 cable fits at once. No source states wire gauges for this unit. PATA plugs are the 4-pin Molex plugs.2Owner's manualcorsair.com/us/en/explorer/diy-builder/power-supply-units/corsair-hxi-series-2025Read 14 October 2026Included cables: 1x ATX 24 pin 610 mm, 2x EPS/ATX12V 4+4 pin 750 mm, 5x PCIe 8-pin 650 mm, 2x 8-pin to 12V-2x6 650 mm, 2x SATA with 4 plugs 850 mm, 2x PATA with 3 plugs. All plus or minus 10 mm.

BMontech Century II 850W

Connector	Connectors	Cables	Length to first plug (mm)	Wire gauge	Rated power (W)
ATX 24-pin (20+4)	1	1	590	18AWG	Not available
CPU 8-pin (EPS, 4+4)	2	2	700	18AWG	Not available
PCIe 8-pin (6+2)	4	2	600	18AWG	Not available
12V-2x6	1	1	600	16AWG	600
SATA power	8	2	500	18AWG	Not available
4-pin Molex	4	1	500	18AWG	Not available

Source1Maker product pagemontechpc.com/century-ii-850wRead 14 October 2026Cables table: 1 motherboard cable with a 20+4 pin plug, 2 CPU cables with one 4+4 pin plug, 2 PCIe cables with two 6+2 pin plugs, 1 12V-2x6 cable, 2 SATA cables with 4 plugs and 1 Molex cable with 4 plugs. Lengths and gauge come from the Cybenetics report.5Measurementcybenetics.com/evaluations/psus/2813Read 14 October 2026Cables and Connectors table: ATX 20+4 pin 590 mm 18AWG, 2 x 4+4 pin EPS 700 mm 18AWG, 2 x 6+2 pin PCIe cables 600 mm then 150 mm with 4 plugs in total 18AWG, 12+4 pin PCIe 600 mm (600W) 16-26AWG, 2 SATA cables of 500 mm plus 3 x 150 mm spacing with 8 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

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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

4=CalculatedFrom Cables

16-pin GPU connectorsiNative 16-pin GPU power plugs: 12V-2x6, 12VHPWR and 16-pin cables of unstated revision. Adapters are not counted. Counts the plugs in the box. Some cables share one PSU socket, which the source note says.

2=CalculatedFrom Cables

1=CalculatedFrom Cables

SATA power connectors

8=CalculatedFrom Cables

8=CalculatedFrom Cables

4-pin Molex connectors

6=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.

Embossed or debossed flat1Maker product pagecorsair.com/us/en/p/psu/cp-9020309-na/hx1500i-fully-modular-ultra-low-noise-platinum-atx-1500-watt-pc-power-supply-cp-9020309-naRead 14 October 2026Cable listing: Cable Type Debossed for every cable except the round USB cable. Reviewers call the cables braided or sleeved, which does not match the maker.3Press releasecorsair.com/newsroom/press-release/corsair-launches-upgraded-hxi-series-psus-with-enhanced-cables-and-dual-color-12v-2x6-gpu-connectorsRead 14 October 2026Updated cables with a debossed design and low-profile cable combs.

Flat1Maker product pagemontechpc.com/century-ii-850wRead 14 October 2026Overview: Flat cables and fully modular design.7Reviewtomshardware.com/pc-components/power-supplies/montech-century-ii-gold-850w-atx-3-1-power-supply-reviewRead 14 October 2026The cable bundle is all-black and entirely flat-ribbon in construction.

Fan

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

140mm1Maker product pagecorsair.com/us/en/p/psu/cp-9020309-na/hx1500i-fully-modular-ultra-low-noise-platinum-atx-1500-watt-pc-power-supply-cp-9020309-naRead 14 October 2026Tech Specs: Fan Size 140mm.

135mm1Maker product pagemontechpc.com/century-ii-850wRead 14 October 2026Specifications tab: Fan Size 135 mm.5Measurementcybenetics.com/evaluations/psus/2813Read 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)1Maker product pagecorsair.com/us/en/p/psu/cp-9020309-na/hx1500i-fully-modular-ultra-low-noise-platinum-atx-1500-watt-pc-power-supply-cp-9020309-naRead 14 October 2026Overview: Fluid Dynamic Bearing fan. Tech Specs: Fan Bearing Technology Fluid Dynamic Bearing.

Fluid dynamic (FDB)1Maker product pagemontechpc.com/century-ii-850wRead 14 October 2026Specifications tab: Fan Bearing FDB.5Measurementcybenetics.com/evaluations/psus/2813Read 14 October 2026DUT Information: 135mm Fluid Dynamic Bearing Fan (HA13525M12SF-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-passive1Maker product pagecorsair.com/us/en/p/psu/cp-9020309-na/hx1500i-fully-modular-ultra-low-noise-platinum-atx-1500-watt-pc-power-supply-cp-9020309-naRead 14 October 2026Tech Specs: Zero RPM Mode Yes. Overview: Zero RPM mode eliminates fan noise at low to medium loads.

Semi-passive1Maker product pagemontechpc.com/century-ii-850wRead 14 October 2026Overview: 135 mm FDB fan with Smart Zero Fan mode.5Measurementcybenetics.com/evaluations/psus/2813Read 14 October 2026DUT Information: Semi-Passive Operation checked (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.

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Yes5Measurementcybenetics.com/evaluations/psus/2813Read 14 October 2026DUT Information: Semi-Passive Operation marked selectable.7Reviewtomshardware.com/pc-components/power-supplies/montech-century-ii-gold-850w-atx-3-1-power-supply-reviewRead 14 October 2026External Appearance: a smaller secondary toggle on the rear lets the user disable the hybrid mode and run the fan continuously.

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), Over-power (OPP), Over-temperature (OTP), Short-circuit (SCP)2Owner's manualcorsair.com/us/en/explorer/diy-builder/power-supply-units/corsair-hxi-series-2025Read 14 October 2026Safety and Protection lists OVP, OCP, OTP, SCP and OPP. UVP, NLO and surge protection are not listed, so they are left out.

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-850wRead 14 October 2026Specifications tab: OPP / OVP / UVP / SCP / OCP / OTP.5Measurementcybenetics.com/evaluations/psus/2813Read 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. 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.

Yes1Maker product pagecorsair.com/us/en/p/psu/cp-9020309-na/hx1500i-fully-modular-ultra-low-noise-platinum-atx-1500-watt-pc-power-supply-cp-9020309-naRead 14 October 2026Overview: 105 C rated 100% Japanese electrolytic capacitors.3Press releasecorsair.com/newsroom/press-release/corsair-launches-upgraded-hxi-series-psus-with-enhanced-cables-and-dual-color-12v-2x6-gpu-connectorsRead 14 October 2026100% Japanese 105 C electrolytic capacitors.

Yes1Maker product pagemontechpc.com/century-ii-850wRead 14 October 2026Overview: 100% Japanese capacitors. The launch article says 100% Japanese electrolytic capacitors.2Press releasemontechpc.com/news-century-iiRead 14 October 2026Article: 100% Japanese electrolytic capacitors.

MTBF (claimed)iThe maker's mean time between failures, such as 100000. An MTTF figure for the whole unit counts too. An MTTF for the fan alone does not. The test temperature goes in the source note.

100,000h1Maker product pagecorsair.com/us/en/p/psu/cp-9020309-na/hx1500i-fully-modular-ultra-low-noise-platinum-atx-1500-watt-pc-power-supply-cp-9020309-naRead 14 October 2026Tech Specs: MTBF Hours 100,000 hours. The test temperature is not stated.

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.

Yes1Maker product pagecorsair.com/us/en/p/psu/cp-9020309-na/hx1500i-fully-modular-ultra-low-noise-platinum-atx-1500-watt-pc-power-supply-cp-9020309-naRead 14 October 2026Overview: iCUE monitors power supply performance. A USB Type-C cable connects the PSU to the motherboard.2Owner's manualcorsair.com/us/en/explorer/diy-builder/power-supply-units/corsair-hxi-series-2025Read 14 October 2026The included USB Type-C cable connects the PSU to the motherboard for iCUE.

Not available

SoftwareiThe maker's software for monitoring or control.

iCUE1Maker product pagecorsair.com/us/en/p/psu/cp-9020309-na/hx1500i-fully-modular-ultra-low-noise-platinum-atx-1500-watt-pc-power-supply-cp-9020309-naRead 14 October 2026Overview: iCUE.

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

No8Retailer pagemaxmybuild.com/power-supplies/montech-century-ii-850wRead 14 October 2026Listing specs: no RGB. Tom's Hardware and the maker page describe no lighting.

Dimensions and weight

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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.

Width150Height86Depth200mm(5.9 × 3.4 × 7.9 in)2Owner's manualcorsair.com/us/en/explorer/diy-builder/power-supply-units/corsair-hxi-series-2025Read 14 October 2026HX1500i 2025: length 200 mm, width 150 mm, height 86 mm. KitGuru prints 150 x 82 x 200 mm.

Width150Height86Depth140mm(5.9 × 3.4 × 5.5 in)1Maker product pagemontechpc.com/century-ii-850wRead 14 October 2026Specifications tab: Dimensions (LxWxH) 140 x 150 x 86 mm, so depth 140, width 150, height 86. Tom's Hardware says the unit is 160 mm long. The maker value is stored and retailers copy it.

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.

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In the box

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

HXi Series ATX Power Supply, Mounting screws, Power Cord, Cable ties1Maker product pagecorsair.com/us/en/p/psu/cp-9020309-na/hx1500i-fully-modular-ultra-low-noise-platinum-atx-1500-watt-pc-power-supply-cp-9020309-naRead 14 October 2026Package Contents: HXi Series ATX Power Supply, mounting screws, power cord, cable ties. KitGuru says the included cord is a C19 cord.

AC power cable, Mounting screws, Velcro-style cable straps, Cable ties, User manual7Reviewtomshardware.com/pc-components/power-supplies/montech-century-ii-gold-850w-atx-3-1-power-supply-reviewRead 14 October 2026In the Box: AC power cable, mounting screws, reusable Velcro-style cable straps, cable ties and a small user manual. Review published 7 September 2026.

Links

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Product page

www.corsair.com/us/en/p/psu/cp-9020309-na/hx1500i-fully-modular-ultra-low-noise-platinum-atx-1500-watt-pc-power-supply-cp-9020309-na1Maker product pagecorsair.com/us/en/p/psu/cp-9020309-na/hx1500i-fully-modular-ultra-low-noise-platinum-atx-1500-watt-pc-power-supply-cp-9020309-naRead 14 October 2026

www.montechpc.com/century-ii-850w1Maker product pagemontechpc.com/century-ii-850wRead 14 October 2026

Spec sheet

Not available

Not available

Manual

www.corsair.com/us/en/explorer/diy-builder/power-supply-units/corsair-hxi-series-20252Owner's manualcorsair.com/us/en/explorer/diy-builder/power-supply-units/corsair-hxi-series-2025Read 14 October 2026

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.

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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.

10years1Maker product pagecorsair.com/us/en/p/psu/cp-9020309-na/hx1500i-fully-modular-ultra-low-noise-platinum-atx-1500-watt-pc-power-supply-cp-9020309-naRead 14 October 2026Tech Specs: Warranty 10 Year. The page is corsair.com US, so the market is US.

10years1Maker product pagemontechpc.com/century-ii-850wRead 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.