be quiet! - Pure Power 12 M 850W vs Corsair - RM1200x SHIFT
Where they actually differ
The most decisive specs, ranked by how much they matter — before the full spec table.
| Spec | be quiet! - Pure Power 12 M 850W | Corsair - RM1200x SHIFT |
|---|---|---|
| Wattage | 850 W | 1200 W |
Between the Pure Power 12 M 850W and RM1200x SHIFT, the Pure Power 12 M 850W comes out ahead in several specs, while the RM1200x SHIFT wins on wattage. Overall, the Pure Power 12 M 850W scores 80.3 and the RM1200x SHIFT scores 84.5 on our Mars Score.
Which should you buy?
The RM1200x SHIFT edges ahead on the Mars Score (80.3 vs 84.5), but the 4.2-point gap is small enough that the right pick comes down to which spec advantages matter to you.
The Pure Power 12 M 850W does not pull ahead on any single popular-comparison spec — its strengths sit in the spec-table groups rather than the headline advantages.
Pick the RM1200x SHIFT if you care most about wattage. Its strongest claims are wattage. The single most decisive one: Wattage — 41.18% more. 1200 W vs 850 W.
Both ship with comparable efficiency, modular, atx 3.0 / 12vhpwr, so those specs do not separate the two — focus on the differences below.
Bottom line: there is no wrong answer here — match the spec advantages to how you actually use the product. The Mars Score parity says both are well-rounded; the differences are about trade-offs, not quality.
Which should you buy: be quiet! - Pure Power 12 M 850W or Corsair - RM1200x SHIFT?
Corsair - RM1200x SHIFT leads the current Mars Score by 4.2 points.The more useful decision is the trade-off behind that result: compare wattage against the way you will actually use the product.
Choose be quiet! - Pure Power 12 M 850W if…
be quiet! - Pure Power 12 M 850W does not lead a decisive measured field here, so choose it for price, ecosystem, design, or availability when those matter more to you.
Choose Corsair - RM1200x SHIFT if…
Corsair - RM1200x SHIFT has the measurable edge on wattage w.
This is a structured comparison of the published catalog values. It is not a claim of identical real-world performance across every workload; use the linked spec drill-downs and methodology page to inspect the inputs.
Why be quiet! - Pure Power 12 M 850W wins
- No decisive advantages.
Why Corsair - RM1200x SHIFT wins
- ▲Wattage — 41.18% more. 1200 W vs 850 W.
Spec comparison
Spec
| Spec | be quiet! - Pure Power 12 M 850W | Corsair - RM1200x SHIFT |
|---|---|---|
| Wattage | 850 W | 1200 Wlead |
| Efficiency | 80+ Gold | 80+ Gold |
| Form factor | ATX | ATX |
Features
| Spec | be quiet! - Pure Power 12 M 850W | Corsair - RM1200x SHIFT |
|---|---|---|
| Modular | full | full |
| Average noise (Cybenetics) | 25.03 dB(A)lead | 29.40 dB(A) |
| ATX 3.0 / 12VHPWR | true | true |
| Warranty | 10 yrs | 10 yrs |