Researched, not hands-on tested.How we review ›
all judged against power supplies at a similar priceThe be quiet! Pure Power 12 M 850W scores 7.7/10 overall, ahead of the Seasonic FOCUS GX-850 ATX 3 (2024) at 6.8/10.
The be quiet! Pure Power 12 M 850W leads on quality and protections, cabling and connectors and noise.
The Seasonic FOCUS GX-850 ATX 3 (2024) leads on efficiency.
They score the same on warranty.
This is an 850 W fully modular ATX 3.0 power supply for builders who want a quiet PC with a modern GPU connector. It suits gaming and general-purpose desktops that will rarely sit near full load. It is a weaker fit for anyone who wants a fan that stops entirely at idle.
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The Seasonic FOCUS GX-850 ATX 3 (2024) is for builders who want a fully modular 850 W unit with a native 12V-2x6 cable for a current graphics card. It suits buyers who value a 10-year warranty and strong efficiency figures on 230V mains. It is a weaker fit for anyone who puts tight voltage regulation or a consistently quiet fan first.
Typically about £144.95 in the UK when we researched itSearch Amazon UK (opens in a new tab, affiliate link)Affiliate link. As an Amazon Associate I earn from qualifying purchases. Details
| Criterion | Weight | be quiet! Pure Power 12 M 850W | Seasonic FOCUS GX-850 ATX 3 (2024) |
|---|---|---|---|
| Quality and protections | 30% | 7/10 | 5/10 |
| Efficiency | 20% | 7/10 | 8/10 |
| Cabling and connectors | 20% | 8/10 | 7/10 |
| Noise | 15% | 7/10 | 5/10 |
| Warranty | 15% | 10/10 | 10/10 |
| Overall | 7.7/10 | 6.8/10 |
| Spec | be quiet! Pure Power 12 M 850W | Seasonic FOCUS GX-850 ATX 3 (2024) |
|---|---|---|
| Rated output (W) | 850 W continuous, 900 W peak; 850 W combined 12V output, 600 W combined 12VHPWR | 850 W |
| Efficiency rating (80 Plus or Cybenetics) | 80 PLUS Gold; up to 93.2% (manufacturer); Cybenetics [115V] Platinum rating, 89–91% | 80 PLUS Gold |
| Form factor (ATX or SFX) and ATX 3.x / PCIe 5.x support | ATX 3.0; PCIe 5.1 compatible | ATX |
| Modular cabling (fully, semi or non-modular) | Fully modular | Fully modular |
| Graphics card connectors (12V-2x6 / 12VHPWR and PCIe 8-pin count) | One 12VHPWR (600 W); four PCIe 6+2-pin; one P8 and one P4+4 CPU; six SATA; two PATA | 1x 12V-2x6 (native); 1x PCIe 12+4 pin (600W) per Hardware Busters; 3x PCIe 6+2 pin; 8x SATA; 3x Molex |
| Fan size and zero-fan mode | One 120 mm rifle bearing fan, max 2000 rpm; no zero-fan mode | 135 mm fluid dynamic bearing fan; semi-passive mode (selectable) |
| Warranty (years) | 10 years | 10 years |
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