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be quiet! Pure Power 13 M 550W vs Montech Century II 850W

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Pure Power 13 M 550W

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Product B: Montech

Century II 850W

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Abe quiet! Pure Power 13 M 550W

BMontech Century II 850W

General

6 of 12 differ

Series

Pure Power 13 M2Retailer pagescan.co.uk/products/550w-be-quiet!-pure-power-13-m-fully-modular-80plus-gold-single-rail-458a-12v-2x6-atx-31-power-supplRead 16 October 2026Listing edition: PURE POWER 13 M.

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.

BP024US, BP024EU1Maker product pagebequiet.com/en/powersupply/5976Read 16 October 2026The search result title of this URL reads Article number BP024US. The EU page, seen only as a search result title, reads Article number BP024EU. Retailers and Cybenetics confirm the EU number: the Cybenetics sample serial prefix 024EUS is the BP024EU model. No source the agent could open states a BP024UK number, so it is not stored.2Retailer pagescan.co.uk/products/550w-be-quiet!-pure-power-13-m-fully-modular-80plus-gold-single-rail-458a-12v-2x6-atx-31-power-supplRead 16 October 2026Model Number BP024EU.5Retailer pagekomputronik.pl/product/975165/zasilacz-pc-be-quiet-pure-power-13-m-550w.htmlRead 16 October 2026Manufacturer code BP024EU.

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

42600521921602Retailer pagescan.co.uk/products/550w-be-quiet!-pure-power-13-m-fully-modular-80plus-gold-single-rail-458a-12v-2x6-atx-31-power-supplRead 16 October 2026GTIN 4260052192160 for model BP024EU. Komputronik and OX.ee show the same EAN.4Retailer pageox.ee/en/product/3200915Read 16 October 2026OX.ee: product code BP024EU, EAN 4260052192160.5Retailer pagekomputronik.pl/product/975165/zasilacz-pc-be-quiet-pure-power-13-m-550w.htmlRead 16 October 2026EAN 4260052192160.

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.

Not available

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

Available3Retailer pageparadigit.ie/be-quiet-pure-power-13-m-550w/21819494/productRead 16 October 2026In stock on the Paradigit Ireland listing in October 2026 with 4 to 5 working days delivery.5Retailer pagekomputronik.pl/product/975165/zasilacz-pc-be-quiet-pure-power-13-m-550w.htmlRead 16 October 2026Listed as available in the main warehouse in October 2026.

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.

€94.97Press articlegeeknetic.es/Noticia/34850/Ya-disponibles-las-be-quiet-Pure-Power-13-M-desde-94-90-euros.htmlRead 16 October 2026The headline says from 94,90 euros and the price table prints 94,40 EUR for the 550W. The two figures disagree. 94.90 fits the headline, the rounded 95 euros in the Geektopia launch article and the price endings of the other models (109.90, 119.90, 134.90, 164.90), so it is stored. The article names no country and does not say whether VAT is included. Be quiet! euro prices are normally shown with VAT.8Press articlegeektopia.es/es/technology/2025/06/10/noticias/be-quiet-anuncia-la-serie-pure-power-13-m-de-fuentes-atx-3-1-y-pcie-5-1.htmlRead 16 October 2026Price list prints 550 W: 95 euros, a rounded figure.

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

Black3Retailer pageparadigit.ie/be-quiet-pure-power-13-m-550w/21819494/productRead 16 October 2026Colour of product: Black.6Retailer pageldlc.com/en/product/PB00696815.htmlRead 16 October 2026Color: Black.

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.

ATX9Measurementcybenetics.com/evaluations/psus/2851Read 16 October 2026DUT Information: Type ATX12V. The back face is 150 x 86 mm, the ATX size.

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 3.12Retailer pagescan.co.uk/products/550w-be-quiet!-pure-power-13-m-fully-modular-80plus-gold-single-rail-458a-12v-2x6-atx-31-power-supplRead 16 October 2026Specifications: Form Factor ATX 3.1. Maker text: ATX 3.1 compliant and PCIe 5.1 compatible.3Retailer pageparadigit.ie/be-quiet-pure-power-13-m-550w/21819494/productRead 16 October 2026ATX version 3.1, EPS version 2.92.4Retailer pageox.ee/en/product/3200915Read 16 October 2026ATX version 3.1, EPS version 2.92.

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 5.12Retailer pagescan.co.uk/products/550w-be-quiet!-pure-power-13-m-fully-modular-80plus-gold-single-rail-458a-12v-2x6-atx-31-power-supplRead 16 October 2026Maker text copied by the shop: PCIe 5.1 compatible, with one PCIe 5.1 12V-2x6 300W and two PCIe 6+2 connectors.4Retailer pageox.ee/en/product/3200915Read 16 October 2026One 12V-2x6 PCIe 5.1 connector with 300 W and two 6+2 pin connectors.8Press articlegeektopia.es/es/technology/2025/06/10/noticias/be-quiet-anuncia-la-serie-pure-power-13-m-de-fuentes-atx-3-1-y-pcie-5-1.htmlRead 16 October 2026ATX 3.1 and PCIe 5.1, with one 12V-2x6 socket that delivers 300 W on the 550 W model.

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 modular2Retailer pagescan.co.uk/products/550w-be-quiet!-pure-power-13-m-fully-modular-80plus-gold-single-rail-458a-12v-2x6-atx-31-power-supplRead 16 October 2026Modularity: Full Modular.6Retailer pageldlc.com/en/product/PB00696815.htmlRead 16 October 2026Modularity: 100% modular.9Measurementcybenetics.com/evaluations/psus/2851Read 16 October 2026DUT Information: Cable Design Fully Modular.

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.

FSP9Measurementcybenetics.com/evaluations/psus/2851Read 16 October 2026DUT Information: OEM/ODM FSP. Parts description: Manufacturer (OEM) FSP.

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

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.

550W2Retailer pagescan.co.uk/products/550w-be-quiet!-pure-power-13-m-fully-modular-80plus-gold-single-rail-458a-12v-2x6-atx-31-power-supplRead 16 October 2026Wattage 550 W.9Measurementcybenetics.com/evaluations/psus/2851Read 16 October 2026Manufacturer-provided information: Rated Power 550 W.

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.

Not available

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.

Single rail2Retailer pagescan.co.uk/products/550w-be-quiet!-pure-power-13-m-fully-modular-80plus-gold-single-rail-458a-12v-2x6-atx-31-power-supplRead 16 October 2026Internal +12V Rails: Single Rail. Max Combined Output +12V 45.8 A. The Rail 1 row prints 15.8 A, which is a typo, since the product title and every other source give 45.8 A.10Reviewhwbusters.com/psus/be-quiet-pure-power-13-m-550w-atx-v3-1-psu-reviewRead 16 October 2026Technical specifications: Number of 12V rails 1.

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.

45.8A2Retailer pagescan.co.uk/products/550w-be-quiet!-pure-power-13-m-fully-modular-80plus-gold-single-rail-458a-12v-2x6-atx-31-power-supplRead 16 October 2026Max Combined Output +12V 45.8 A.3Retailer pageparadigit.ie/be-quiet-pure-power-13-m-550w/21819494/productRead 16 October 2026Max output current (+12V1) 45.8 A.9Measurementcybenetics.com/evaluations/psus/2851Read 16 October 2026Power specifications table: +12V 45.8 A, 550 W. The unit label photo prints 45.8A.

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.

550W2Retailer pagescan.co.uk/products/550w-be-quiet!-pure-power-13-m-fully-modular-80plus-gold-single-rail-458a-12v-2x6-atx-31-power-supplRead 16 October 2026Maker text: 550 Watts, one 12V rail. The Cybenetics power table gives 550 W on +12V.3Retailer pageparadigit.ie/be-quiet-pure-power-13-m-550w/21819494/productRead 16 October 2026Combined power (+12V) 550 W.9Measurementcybenetics.com/evaluations/psus/2851Read 16 October 2026Power specifications table: +12V 550 W.

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.

120W3Retailer pageparadigit.ie/be-quiet-pure-power-13-m-550w/21819494/productRead 16 October 2026Combined power +3.3V 120 W and +5V 120 W, printed per rail. Cybenetics and Hardware Busters show 120 W combined.9Measurementcybenetics.com/evaluations/psus/2851Read 16 October 2026Power specifications table: one 120 W cell for 3.3V and 5V, with 20 A each.

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.

3A3Retailer pageparadigit.ie/be-quiet-pure-power-13-m-550w/21819494/productRead 16 October 2026Max output current (+5Vsb) 3 A, 15 W.9Measurementcybenetics.com/evaluations/psus/2851Read 16 October 2026Power specifications table: 5VSB 3 A, 15 W.

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.

Lowest100Highest240V9Measurementcybenetics.com/evaluations/psus/2851Read 16 October 2026Manufacturer-provided information: rated voltage 100-240 Vrms, 5-10 A, 50-60 Hz. The unit label photo in the report prints 100-240Vac 50-60Hz 10-5A.

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.

Yes9Measurementcybenetics.com/evaluations/psus/2851Read 16 October 2026Temperature and Compliance Info: ALPM (Alternative Low Power Mode) compatible, checked.

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 Platinum11Certification listclearesult.com/80plus/sites/80plus/files/manufacturer-certificate/BE%20QUIET_L13-M-550W_550W_SOCE%207799_Report.pdfRead 16 October 202680 PLUS certificate for model L13-M-550W: Platinum at 115 V, type ATX 3.1, ID 7799, test date 2025-04-16. The sample serial 024EUS4510000032 carries the same 024EU model code as the Cybenetics sample of this unit. The maker and retailers claim 80 PLUS Gold.

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 Platinum9Measurementcybenetics.com/evaluations/psus/2851Read 16 October 2026Report 25PS2851A, certification ID 252851, issued Jun 18, 2025. ETA Platinum at 115V (badge image 16, Platinum). The sample serial 024EUS5081000876 on the label photo is the EU model BP024EU. The maker and retailers claim 80 PLUS Gold.

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.

Cybenetics Platinum9Measurementcybenetics.com/evaluations/psus/2851Read 16 October 2026ETA Platinum at 230V (badge image 28, Platinum 230v).

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++9Measurementcybenetics.com/evaluations/psus/2851Read 16 October 2026LAMBDA A++ at 115V (badge image 19). Hardware Busters prints A++ for both voltages.

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.

A++9Measurementcybenetics.com/evaluations/psus/2851Read 16 October 2026LAMBDA A++ at 230V (badge image 31, A++ 230v).

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.

90.603%9Measurementcybenetics.com/evaluations/psus/2851Read 16 October 2026Average over more than 1450 load combinations at 115V. Received May 9, 2025, tested Jun 16, 2025. Ambient 28-32 C. EU sample.

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.

92.463%9Measurementcybenetics.com/evaluations/psus/2851Read 16 October 2026Average over more than 1450 load combinations at 230V.

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.

69.68%9Measurementcybenetics.com/evaluations/psus/2851Read 16 October 2026Efficiency at 2% load at 115V. The unit is above 500 W, so the 2% load applies. At 230V it is 71.581%.

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.

0.9879Measurementcybenetics.com/evaluations/psus/2851Read 16 October 2026Average over more than 1450 load combinations at 115V. At 230V it is 0.957.

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.

6dB(A)9Measurementcybenetics.com/evaluations/psus/2851Read 16 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 also 6.00 dBA.

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.

8.7dB(A)9Measurementcybenetics.com/evaluations/psus/2851Read 16 October 2026Typical load tests at 115V, 100% load row: 8.7 dB(A) at 687 rpm fan speed, intake about 45.5 C. At 230V it is 7.6 dB(A) at 662 rpm. The unit is semi-passive, so the fan is at 0 rpm up to 40% load at 115V.

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.

0.0434W9Measurementcybenetics.com/evaluations/psus/2851Read 16 October 2026Standby power consumption at 115V with no load on +5VSB: 0.0434 W. At 230V it is 0.1319 W.

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.

25.3ms9Measurementcybenetics.com/evaluations/psus/2851Read 16 October 2026Hold-Up Time and PWR_OK Signal: hold-up time 25.3 ms, AC loss to PWR_OK 23.4 ms, PWR_OK inactive to DC loss 1.9 ms, at maximum continuous load. The report names no input voltage. A retailer data sheet copy prints 21.68 ms, which is a maker claim and is not stored.

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.

25.54mV9Measurementcybenetics.com/evaluations/psus/2851Read 16 October 2026Non-accredited. 12V ripple at full load at 115V. At 230V it is 26.53 mV.

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.

0.45%9Measurementcybenetics.com/evaluations/psus/2851Read 16 October 2026Non-accredited. 12V load regulation at 115V. The 230V figure is also 0.45%.

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

6 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.

Abe quiet! Pure Power 13 M 550W

Connector	Connectors	Cables	Length to first plug (mm)	Wire gauge	Rated power (W)
ATX 24-pin (20+4)	1	1	550	18-22AWG	Not available
CPU 8-pin (EPS, 4+4)	1	1	650	18AWG	Not available
PCIe 8-pin (6+2)	2	2	500	18AWG	Not available
12V-2x6	1	1	600	16AWG	300
SATA power	3	1	500	16-28AWG	Not available
SATA power	2	1	510	18AWG	Not available
4-pin Molex	2	1	510	18AWG	Not available

Source9Measurementcybenetics.com/evaluations/psus/2851Read 16 October 2026Cables and Connectors table: ATX 24 pin 550 mm 18-22AWG, 4+4 pin EPS12V 650 mm 18AWG, two single 6+2 pin PCIe cables 500 mm 18AWG, 12+4 pin PCIe 600 mm (300W) 16-28AWG, one SATA cable (500 mm then 150 mm and 150 mm spacing, 3 plugs) 16-28AWG, and one SATA and Molex cable (510 mm then 150 mm to the second SATA plug, then the 2 Molex plugs at 150 mm and 145 mm spacing) 18AWG. The 16-28AWG range of the 12V-2x6 cable includes the thin sideband wires, so the 16AWG power wire gauge is stored. The 3-plug SATA cable shows the same 16-28AWG range, stored as published. The first plug of the Molex cable is its SATA plug at 510 mm. The 12V-2x6 cable is rated 300 W, as the maker's text and Hardware Busters say. Hardware Busters' second page prints a cable count of 1 for the two 6+2 pin PCIe plugs, while Cybenetics and the first page of that review give 2 cables.10Reviewhwbusters.com/psus/be-quiet-pure-power-13-m-550w-atx-v3-1-psu-reviewRead 16 October 2026Technical specifications: 1x EPS (1 cable), 2x PCIe 6+2 pin (2 cables), 1x PCIe 12+4 pin (300W), 5x SATA (2 cables), 2x 4-pin Molex (1 cable). The modular panel has eight sockets, including a native 12V-2x6 header with a maximum power output of 300W. The review lists no MSRP, so no USD launch price is stored.

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.

1=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.

2=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

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8=CalculatedFrom Cables

4-pin Molex connectors

2=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.

Mixed10Reviewhwbusters.com/psus/be-quiet-pure-power-13-m-550w-atx-v3-1-psu-reviewRead 16 October 2026No text states the cable style. The box_cables photo on page 2 shows six modular cables: two braided sleeved cables and four flat cables. The photo is not labelled per cable. A retailer for the 750W model of the same line describes sleeved 24-pin and 12V-2x6 cables with flat other cables. The Scan listing text says every cable is sleeved, which is line marketing copy that the photo does not support.

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.

120mm2Retailer pagescan.co.uk/products/550w-be-quiet!-pure-power-13-m-fully-modular-80plus-gold-single-rail-458a-12v-2x6-atx-31-power-supplRead 16 October 2026Fans: 1 x 120mm.9Measurementcybenetics.com/evaluations/psus/2851Read 16 October 2026DUT Information: 120mm fan.

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.

Rifle2Retailer pagescan.co.uk/products/550w-be-quiet!-pure-power-13-m-fully-modular-80plus-gold-single-rail-458a-12v-2x6-atx-31-power-supplRead 16 October 2026Maker text: 120mm Rifle Bearing Fan.4Retailer pageox.ee/en/product/3200915Read 16 October 2026Bearing: Rifle.9Measurementcybenetics.com/evaluations/psus/2851Read 16 October 2026DUT Information: 120mm Rifle Bearing Fan (BQ QF2-12025-LS).

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-passive4Retailer pageox.ee/en/product/3200915Read 16 October 2026Semi-passive 120 mm fan.9Measurementcybenetics.com/evaluations/psus/2851Read 16 October 2026DUT Information: Semi-Passive Operation checked. The 10% to 40% load rows at 115V show 0 rpm.

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.

No10Reviewhwbusters.com/psus/be-quiet-pure-power-13-m-550w-atx-v3-1-psu-reviewRead 16 October 2026Product photos page: at the front side there is no switch to enable or disable semi-passive operation.

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), Under-voltage (UVP), Over-power (OPP), Over-temperature (OTP), Short-circuit (SCP), No-load (NLO), Surge and inrush (SIP)4Retailer pageox.ee/en/product/3200915Read 16 October 2026Power protection features: over current, over power, over voltage, overheating, short circuit, surge and inrush protection (SIP), under voltage. NLO comes from the Cybenetics protection tests.5Retailer pagekomputronik.pl/product/975165/zasilacz-pc-be-quiet-pure-power-13-m-550w.htmlRead 16 October 2026Protections: OCP, OPP, OTP, OVP, SCP, SIP, UVP.8Press articlegeektopia.es/es/technology/2025/06/10/noticias/be-quiet-anuncia-la-serie-pure-power-13-m-de-fuentes-atx-3-1-y-pcie-5-1.htmlRead 16 October 2026Lists OCP, OPP, OTP, OVP, SCP and UVP.9Measurementcybenetics.com/evaluations/psus/2851Read 16 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. OVP is a maker claim that 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), 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.

Not available

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.

100,000h3Retailer pageparadigit.ie/be-quiet-pure-power-13-m-550w/21819494/productRead 16 October 2026Mean time between failures (MTBF) 100000 h. The test temperature is not stated.4Retailer pageox.ee/en/product/3200915Read 16 October 2026MTBF 100000 h.5Retailer pagekomputronik.pl/product/975165/zasilacz-pc-be-quiet-pure-power-13-m-550w.htmlRead 16 October 2026MTBF 100000 h.

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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

No6Retailer pageldlc.com/en/product/PB00696815.htmlRead 16 October 2026Physical characteristics: LED RGB No.

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.

Width150Height86Depth160mm(5.9 × 3.4 × 6.3 in)2Retailer pagescan.co.uk/products/550w-be-quiet!-pure-power-13-m-fully-modular-80plus-gold-single-rail-458a-12v-2x6-atx-31-power-supplRead 16 October 2026Dimensions printed as 160 x 150 x 86 (WxHxD). The back face of an ATX unit is 150 x 86 mm, so the depth is 160 mm.3Retailer pageparadigit.ie/be-quiet-pure-power-13-m-550w/21819494/productRead 16 October 2026Depth 160 mm, width 150 mm, height 86 mm. The listing weight of 2230 g is a packed weight and is not stored.10Reviewhwbusters.com/psus/be-quiet-pure-power-13-m-550w-atx-v3-1-psu-reviewRead 16 October 2026Technical specifications: 150 x 85 x 160 mm (W x H x D). The retailer figures, copied from the maker, give 86 mm for the height.

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.

1.65kg(3.6 lb)10Reviewhwbusters.com/psus/be-quiet-pure-power-13-m-550w-atx-v3-1-psu-reviewRead 16 October 2026Technical specifications: 1.65 kg (3.64 lb). The review does not say whether cables are included. Retailers list 2.23 kg, which is most likely the packed weight and is not stored.

Not available

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, 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.bequiet.com/en/powersupply/59761Maker product pagebequiet.com/en/powersupply/5976Read 16 October 2026Maker page for BP024US. The agent did not open it, since bequiet.com is on the blocked list. No value is taken from the page.

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

Spec sheet

Not available

Not available

Manual

Not available

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.

10years2Retailer pagescan.co.uk/products/550w-be-quiet!-pure-power-13-m-fully-modular-80plus-gold-single-rail-458a-12v-2x6-atx-31-power-supplRead 16 October 2026Warranty 10 Year on the UK listing. Komputronik also prints 10 years and Hardware Busters prints 10 years.5Retailer pagekomputronik.pl/product/975165/zasilacz-pc-be-quiet-pure-power-13-m-550w.htmlRead 16 October 2026Warranty 10 years in an external service. The listing is the Polish market.10Reviewhwbusters.com/psus/be-quiet-pure-power-13-m-550w-atx-v3-1-psu-reviewRead 16 October 2026Warranty: 10 Years.

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.