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 Corsair CX650 650W 80 PLUS Bronze ATX PSU at 5.3/10.
The be quiet! Pure Power 12 M 850W leads on quality and protections, efficiency, cabling and connectors, noise and warranty.
The biggest difference is cabling and connectors, where the be quiet! Pure Power 12 M 850W scores 8/10 to the Corsair CX650 650W 80 PLUS Bronze ATX PSU's 4/10.
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 Corsair CX650 is a 650W ATX power supply with fixed cabling and 80 PLUS Bronze efficiency. It suits a single-GPU desktop or a small server with a few drives. It is less suited to builds that need modular cabling, a native 12V-2x6 cable or high efficiency.
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| Criterion | Weight | be quiet! Pure Power 12 M 850W | Corsair CX650 650W 80 PLUS Bronze ATX PSU |
|---|---|---|---|
| Quality and protections | 30% | 7/10 | 6/10 |
| Efficiency | 20% | 7/10 | 5/10 |
| Cabling and connectors | 20% | 8/10 | 4/10 |
| Noise | 15% | 7/10 | 5/10 |
| Warranty | 15% | 10/10 | 6/10 |
| Overall | 7.7/10 | 5.3/10 |
| Spec | be quiet! Pure Power 12 M 850W | Corsair CX650 650W 80 PLUS Bronze ATX PSU |
|---|---|---|
| Rated output (W) | 850 W continuous, 900 W peak; 850 W combined 12V output, 600 W combined 12VHPWR | 650 W continuous |
| Efficiency rating (80 Plus or Cybenetics) | 80 PLUS Gold; up to 93.2% (manufacturer); Cybenetics [115V] Platinum rating, 89–91% | 80 PLUS Bronze |
| Form factor (ATX or SFX) and ATX 3.x / PCIe 5.x support | ATX 3.0; PCIe 5.1 compatible | ATX (ATX12V v2.31; ATX 3.x not stated) |
| Modular cabling (fully, semi or non-modular) | Fully modular | No (non-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 | 2 PCIe 8-pin (6+2) on one cable; 3 SATA on one cable; 2 PATA 4-pin; no 12V-2x6 or 12VHPWR |
| Fan size and zero-fan mode | One 120 mm rifle bearing fan, max 2000 rpm; no zero-fan mode | 120mm sleeve bearing, thermally controlled; zero-RPM mode not stated |
| Warranty (years) | 10 years | 5 years |
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