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 RMe Series RM850e at 7.0/10.
The be quiet! Pure Power 12 M 850W leads on efficiency, cabling and connectors and warranty.
The Corsair RMe Series RM850e leads on noise.
They score the same on quality and protections.
The biggest difference is warranty, where the be quiet! Pure Power 12 M 850W scores 10/10 to the Corsair RMe Series RM850e's 7/10.
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 RM850e is an 850W ATX power supply for people building or upgrading a quiet desktop or workstation. It suits buyers who want a fully modular unit with a native 12V-2x6 cable and a seven-year warranty. It is less suited to builds that need many PCIe 8-pin cables or a low-load, always-on setup.
Typically about £94.99 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 | Corsair RMe Series RM850e |
|---|---|---|---|
| Quality and protections | 30% | 7/10 | 7/10 |
| Efficiency | 20% | 7/10 | 6/10 |
| Cabling and connectors | 20% | 8/10 | 7/10 |
| Noise | 15% | 7/10 | 8/10 |
| Warranty | 15% | 10/10 | 7/10 |
| Overall | 7.7/10 | 7.0/10 |
| Spec | be quiet! Pure Power 12 M 850W | Corsair RMe Series RM850e |
|---|---|---|
| Rated output (W) | 850 W continuous, 900 W peak; 850 W combined 12V output, 600 W combined 12VHPWR | 850W |
| Efficiency rating (80 Plus or Cybenetics) | 80 PLUS Gold; up to 93.2% (manufacturer); Cybenetics [115V] Platinum rating, 89–91% | Cybenetics 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 | 2 x PCIe 8-pin (6+2), 1 x 12V-2x6, 2 x EPS |
| Fan size and zero-fan mode | One 120 mm rifle bearing fan, max 2000 rpm; no zero-fan mode | 120mm rifle-bearing fan |
| Warranty (years) | 10 years | 7 years |
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