Power supplies / Compare

Montech Century II 850W vs Phanteks AMP GH 850W

A

Product A: Montech

Century II 850W

54 of 66 known

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B

Product B: Phanteks

AMP GH 850W

38 of 66 known

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Only differences

AMontech Century II 850W

BPhanteks AMP GH 850W

General

6 of 12 differ

Series

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

AMP GH1Maker product pagephanteks.com/product/amp-gh-black-850Read 16 October 2026Page title: AMP GH, Fully Modular Power Supply, 850 W.

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

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

PH-P850GH_BK01, PH-P850GH_WT011Maker product pagephanteks.com/product/amp-gh-black-850Read 16 October 2026Specifications: Model No. PH-P850GH_BK01 for the black unit. The white unit PH-P850GH_WT01 is on the white page. The manual and installation guide name the rating-label model PH-P850GH_01.2Maker product pagephanteks.com/product/amp-gh-white-850Read 16 October 2026Model No. PH-P850GH_WT01.

GTIN / EAN

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

886523510413, 886523510475, 886523510536, 886523510420, 886523510482, 8865235105431Maker product pagephanteks.com/product/amp-gh-black-850Read 16 October 2026UPC Code EU 886523510413, UK 886523510475, US 886523510536 for the black unit.2Maker product pagephanteks.com/product/amp-gh-white-850Read 16 October 2026UPC Code EU 886523510420, UK 886523510482, US 886523510543 for the white unit.8Retailer pagewatercoolinguk.co.uk/product/phanteks-amp-gh-850w-atx-3-1-pcie-5-1-80-plus-gold-modular-power-supplyRead 16 October 2026SKU POW-PHK-02519, EAN 886523510475, which is the UK UPC of the black unit.

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

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).

Not available

Status

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.

Available1Maker product pagephanteks.com/product/amp-gh-black-850Read 16 October 2026The 850 W unit is on the current Phanteks product range, and UK retailers list it as in stock in October 2026.8Retailer pagewatercoolinguk.co.uk/product/phanteks-amp-gh-850w-atx-3-1-pcie-5-1-80-plus-gold-modular-power-supplyRead 16 October 2026Listed as in stock in October 2026 (37 in stock).

PredecessoriThe model this one directly replaced, in the same line, tier and size, as the maker or a trusted review names it.

Not available

Not available

SuccessoriThe model that directly replaced this one, in the same line, tier and size. A revision such as a Slim or OLED model does not count when a next generation exists.

Not available

Not available

Launch price (US)iThe maker's US launch MSRP for the stated configuration, excluding tax. Current store prices and later discounts do not qualify.

$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.

$119.996Press articlehartware.de/2024/07/17/phanteks-unveils-two-new-products-amp-gh-psus-and-polar-st-cpu-air-coolersRead 16 October 2026MSRP: AMP GH 850W GOLD Black $119.99 and White $129.99. The release does not say whether tax is included, and US prices are normally shown before tax.

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

€119.96Press articlehartware.de/2024/07/17/phanteks-unveils-two-new-products-amp-gh-psus-and-polar-st-cpu-air-coolersRead 16 October 2026MSRP: AMP GH 850W GOLD Black EUR 119.90 and White EUR 129.90. The release names Europe and not a country.

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

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.

Black, White1Maker product pagephanteks.com/product/amp-gh-black-850Read 16 October 2026Colors on the page: Black, White. The Color row of this page says Black.2Maker product pagephanteks.com/product/amp-gh-white-850Read 16 October 2026Color: White.

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 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).

ATX1Maker product pagephanteks.com/product/amp-gh-black-850Read 16 October 2026Specifications: Compact ATX size, 140 x 150 x 86 mm.

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 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.

ATX 3.11Maker product pagephanteks.com/product/amp-gh-black-850Read 16 October 2026Platform: Intel ATX 3.1 | PCIe Gen5.1. Built to ATX 3.1 specifications.3Owner's manualphanteks.com/manuals/AMP_GH_Manual_v1.1.pdfRead 16 October 2026Cover page: ATX 3.1 platform.

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

PCIe 5.11Maker product pagephanteks.com/product/amp-gh-black-850Read 16 October 2026Platform: PCIe Gen5.1. Latest PCIe Gen 5.1 GPU cable technology with the 12V-2x6 connector.3Owner's manualphanteks.com/manuals/AMP_GH_Manual_v1.1.pdfRead 16 October 2026Cover page: PCIe Gen5.1 support.

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

Fully modular1Maker product pagemontechpc.com/century-ii-850wRead 14 October 20265Measurementcybenetics.com/evaluations/psus/2813Read 14 October 2026DUT Information: Cable Design Fully Modular.

Fully modular1Maker product pagephanteks.com/product/amp-gh-black-850Read 16 October 2026Back Plate: Fully Modular.3Owner's manualphanteks.com/manuals/AMP_GH_Manual_v1.1.pdfRead 16 October 2026Cover page: 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.

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.

Not available

Power

5 of 9 differ

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

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

850W1Maker product pagephanteks.com/product/amp-gh-black-850Read 16 October 2026Power Output 850 Watt. DC Output 850W.

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.

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.

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

Single rail7Press articlekitguru.net/components/power-supplies/joao-silva/phanteks-unveils-compact-and-affordable-amp-gh-psusRead 16 October 2026Text: a single +12V rail design, active PFC and DC-to-DC switching. The maker output table lists one 12V column.

+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.

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

70A1Maker product pagephanteks.com/product/amp-gh-black-850Read 16 October 2026Output table: 12V maximum output 70A.

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

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

840W1Maker product pagephanteks.com/product/amp-gh-black-850Read 16 October 2026Output table: maximum capacity 840W under 12V. DC Output 850W for the whole unit.

+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.

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

100W1Maker product pagephanteks.com/product/amp-gh-black-850Read 16 October 2026Output table: 5V 20A and 3.3V 20A share one 100W maximum capacity cell. The -12V 0.3A rail is 3.6W.

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

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

2.5A1Maker product pagephanteks.com/product/amp-gh-black-850Read 16 October 2026Output table: 5VSB maximum output 2.5A, 12.5W.

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

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.

Lowest100Highest240V1Maker product pagephanteks.com/product/amp-gh-black-850Read 16 October 2026AC Input 100-240V ~ 10A 50-60Hz.9Reviewxtremehardware.com/recensioni/14837-phanteks-amp-gh-850-recensioneRead 16 October 2026The box table prints AC input 100-240Vac 50-60Hz 10A. The spec table image in the review reads 200-240V, which is likely a misread of a low-resolution image, since the maker page and the box say 100-240V.

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

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

Not available

Certifications

4 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 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.

80 PLUS Gold1Maker product pagephanteks.com/product/amp-gh-black-850Read 16 October 2026Specifications: 80 Plus Gold. This is the maker claim. The 80 PLUS list has an entry for the label model PH-P850GH_01 (ID 6800.2, Gold, tested 2022-04-11, input current 12-6 A), which the agent did not match to this unit, since the maker page prints 10 A. No entry for PH-P850GH_BK01 exists.

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

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.

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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 Platinum5Measurementcybenetics.com/evaluations/psus/2813Read 14 October 2026ETA Platinum at 230V.

Not available

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-5Measurementcybenetics.com/evaluations/psus/2813Read 14 October 2026LAMBDA A- at 115V.

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

A-5Measurementcybenetics.com/evaluations/psus/2813Read 14 October 2026LAMBDA A- at 230V.

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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.

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.

Not available

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

91.84%5Measurementcybenetics.com/evaluations/psus/2813Read 14 October 2026Average over more than 1450 load combinations at 230V.

Not available

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.

70.357%5Measurementcybenetics.com/evaluations/psus/2813Read 14 October 2026Efficiency at 2% load (more than 500 W unit) at 115V.

Not available

Average power factor at 115V (measured)iAverage power factor over the whole load range at 115V input. 1 is the best possible value.

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

Not available

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.

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.

Not available

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.

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.

Not available

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.

0.073W5Measurementcybenetics.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.

Not available

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.

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.

Not available

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

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

Not available

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

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

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Cables and connectors

5 of 7 differ

CablesiOne row per kind of cable that runs from the PSU to a device. Connector is the plug at the device end. Count is the number of those plugs over all cables in the row. Length runs from the PSU end to the first plug. Adapters that plug into other cables are left out. Use 16-pin PCIe when the maker names a 16-pin GPU cable without saying 12V-2x6 or 12VHPWR. A cable from a 12V-2x6 socket on the PSU to 8-pin plugs is a cable, not an adapter, and counts as PCIe 8-pin. When the maker's documents name one GPU cable both 12VHPWR and 12V-2x6, use 16-pin PCIe and name both in the source note. Cables of one connector kind with different lengths or wire gauges get one row each.

AMontech 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.

BPhanteks AMP GH 850W

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	650	Not available
PCIe 8-pin (6+2)	3	3	750	Not available
12V-2x6	1	1	720	450
SATA power	10	3	450	Not available
4-pin Molex	2	1	450	Not available

Source1Maker product pagephanteks.com/product/amp-gh-black-850Read 16 October 2026The page now prints Scope of Delivery, Cables, Textured: 1x 18+10-Pin Mainboard 600 mm, 2x 4+4-Pin CPU 700 mm, 3x 6+2-Pin PCI-E 750 mm, 1x 12V-2x6 720 mm, 1x 6-Pin 4-SATA 400 mm and 1x 6-Pin 2-SATA + 2-Molex 400 mm (120 mm spacing), with 6 CPU|PCIe and 4 SATA|Molex sockets. The retail box table of the 850W unit (photo in the XtremeHardware review), the installation guide and an earlier copy of this page in that review give 610, 650, 750, 720 and 450 mm and two 4-SATA cables plus one 2-SATA + 2-Molex cable, on 5 CPU|PCIe and 3 SATA|Molex sockets, which matches the Phanteks product render. The box and guide values are stored and the conflict with the current page text is noted for review. The 12V-2x6 cable is 450W on the page, the box and the review, while retailers print 600W.4Owner's manualphanteks.com/manuals/AMP_GH_Installation_Guide_v1.1.pdfRead 16 October 2026Cable table for the whole GH range: motherboard 24-pin 610 mm, CPU 4+4-pin 650 mm, PCIe 6+2-pin 750 mm, 12V-2x6 720 mm, SATA 4 plugs 450 mm with 150 mm spacing, SATA and Molex 2 and 2 plugs 450 mm. It says the amount of cables may vary by model, so the counts per cable type come from the retail box table of the 850W unit.9Reviewxtremehardware.com/recensioni/14837-phanteks-amp-gh-850-recensioneRead 16 October 2026The box photo of the 850W unit prints a cable table with cable number, connectors per cable and length: 24-pin 1 cable 610 mm, CPU 2 cables 650 mm, PCIe 6+2 3 cables 750 mm, 12V-2x6 1 cable 720 mm, SATA 2 cables with 4 plugs each (450 mm then 150 mm spacing), SATA and Molex 1 cable with 2 SATA and 2 Molex plugs (450 mm then 150 mm spacing). The text names the same cables and the maker spec table copy in the review shows 5 CPU|PCIe and 3 SATA|Molex sockets. The text puts the cable length between 610 mm and 750 mm. No wire gauge is given.

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.

4=CalculatedFrom Cables

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

1=CalculatedFrom Cables

1=CalculatedFrom Cables

SATA power connectors

8=CalculatedFrom Cables

10=CalculatedFrom Cables

4-pin Molex connectors

4=CalculatedFrom Cables

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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.

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.

Sleeved9Reviewxtremehardware.com/recensioni/14837-phanteks-amp-gh-850-recensioneRead 16 October 2026Text: every included cable has individually sleeved wires with a textured rubber coating that imitates a paracord sleeve. The bundle photo shows round, individually sleeved wires and no flat ribbon cables. The maker calls them individually textured cables. Stored as sleeved because none of flat, embossed or mixed fits.

Fan

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

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.

120mm1Maker product pagephanteks.com/product/amp-gh-black-850Read 16 October 2026Cooling Fan: 120 mm.9Reviewxtremehardware.com/recensioni/14837-phanteks-amp-gh-850-recensioneRead 16 October 2026120 mm fan inside the unit.

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 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).

Hydrodynamic (HDB)1Maker product pagephanteks.com/product/amp-gh-black-850Read 16 October 2026The feature text says 120 mm Hydraulic Dynamic Bearing Fan and defines it as the hydraulic dynamic bearing (HDB). The Cooling Fan row says 120 mm Hydraulic bearing fan. HDB is stored as hydrodynamic.9Reviewxtremehardware.com/recensioni/14837-phanteks-amp-gh-850-recensioneRead 16 October 2026The fan is a Yate Loon D12SH-12 with the Hydraulic Dynamic Bearing system, 12V, 2200 RPM maximum.

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 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).

Semi-passive1Maker product pagephanteks.com/product/amp-gh-black-850Read 16 October 2026Premium Hybrid Mode: operates completely fanless under 30% load.4Owner's manualphanteks.com/manuals/AMP_GH_Installation_Guide_v1.1.pdfRead 16 October 2026Step 06 Hybrid Fan Mode: unlocks the 0RPM fan speed when under 30% load.

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.

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.

Yes4Owner's manualphanteks.com/manuals/AMP_GH_Installation_Guide_v1.1.pdfRead 16 October 2026Step 06 Hybrid Fan Mode: it is turned on when the button is pressed in, and off when pressed again. The user can switch the semi-passive mode off.9Reviewxtremehardware.com/recensioni/14837-phanteks-amp-gh-850-recensioneRead 16 October 2026The rear panel has the AC inlet, the main power switch and a button that turns the hybrid mode on or off.

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)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.

Over-current (OCP), Over-voltage (OVP), Under-voltage (UVP), Over-power (OPP), Over-temperature (OTP), Short-circuit (SCP), No-load (NLO)1Maker product pagephanteks.com/product/amp-gh-black-850Read 16 October 2026Output Protection: OPP, OVP, UVP, SCP, OCP, OTP, No-Load Protection and Reset Protection. Reset protection has no option in the schema.9Reviewxtremehardware.com/recensioni/14837-phanteks-amp-gh-850-recensioneRead 16 October 2026Lists OPP, OVP, UVP, SCP, OCP, OTP, No-Load Protection and Reset Protection, copied from the maker.

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 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.

Not available

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.

Not available

100,000h1Maker product pagephanteks.com/product/amp-gh-black-850Read 16 October 2026MTBF > 100.000 hrs at 25 C (Excluding DC fan). Published with a greater-than sign.

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.

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SoftwareiThe maker's software for monitoring or control.

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Built-in power displayiA screen on the unit that shows live power draw or other readings.

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RGB lighting

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.

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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.

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.

Width150Height86Depth140mm(5.9 × 3.4 × 5.5 in)1Maker product pagephanteks.com/product/amp-gh-black-850Read 16 October 2026Length x Width x Height 140 x 150 x 86 mm (5.5 x 5.9 x 3.4 in). Depth is 140 mm and the back face is 150 x 86 mm.

WeightiWeight of the unit alone. Use the Hardware Busters figure on hwbusters.com when the maker states none, not a copy on another site. Maker weights that include cables or the box, such as Corsair's, and retailer packed weights are not stored. A net weight counts unless the maker says it includes the cables.

Not available

1.4kg(3.1 lb)1Maker product pagephanteks.com/product/amp-gh-black-850Read 16 October 2026Net Weight 1.40 kg (3.08 lbs). Gross Weight 3.20 kg is the packed weight and is 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.

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.

1x AMP GH power supply unit, 1x C13 Power cord 1500 mm, 1x User's manual, 1x PSU bag, 1x PSU tester, 1x Zip tie bag, 1x Screw pack, 1x Velcro pack, 1x Installation guide1Maker product pagephanteks.com/product/amp-gh-black-850Read 16 October 2026Scope of Delivery: power supply, C13 power cord 1500 mm, the cables, and an accessory box with PSU bag, PSU tester, zip tie bag, screw pack, velcro pack and installation guide. The AC cord differs per region.4Owner's manualphanteks.com/manuals/AMP_GH_Installation_Guide_v1.1.pdfRead 16 October 2026Accessories Included: user manual, installation guide, PSU bag, cable bag, ziptie bag, screw pack. The maker page lists the accessory box in more detail.9Reviewxtremehardware.com/recensioni/14837-phanteks-amp-gh-850-recensioneRead 16 October 2026Bundle list: power supply, cable set, velcro and plastic cable ties, 4 PSU screws, power cord and manuals. The copy of the maker spec table in the review lists an accessory box with a user's manual, installation guide, PSU bag, PSU tester, zip tie bag, screw pack and velcro pack.

Links

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Product page

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

phanteks.com/product/amp-gh-black-8501Maker product pagephanteks.com/product/amp-gh-black-850Read 16 October 2026

Spec sheet

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Manual

Not available

phanteks.com/manuals/AMP_GH_Manual_v1.1.pdf3Owner's manualphanteks.com/manuals/AMP_GH_Manual_v1.1.pdfRead 16 October 2026User manual v1.1 for PH-P650GH_01 to PH-P1300GH_01, including PH-P850GH_01.

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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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 pagemontechpc.com/century-ii-850wRead 14 October 2026Specifications tab: Warranty 10 Years. The page is the global maker page and names no market.

8years1Maker product pagephanteks.com/product/amp-gh-black-850Read 16 October 2026Specifications: Warranty 8 Years limited. The manual says terms may vary by region. A UK retailer prints 12 Months for its own listing.3Owner's manualphanteks.com/manuals/AMP_GH_Manual_v1.1.pdfRead 16 October 2026Cover page: 8 years warranty. Page 3: warranty terms may vary between geographic regions.7Press articlekitguru.net/components/power-supplies/joao-silva/phanteks-unveils-compact-and-affordable-amp-gh-psusRead 16 October 2026All models have a limited 8-year warranty.

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