Where they actually differ
The most decisive specs, ranked by how much they matter — before the full spec table.
| Spec | Corsair - RM850e (2023) | Seasonic - VERTEX GX-1200 |
|---|---|---|
| Wattage | 850 W | 1200 W |
| Warranty | 7 yrs | 12 yrs |
Between the RM850e (2023) and VERTEX GX-1200, the RM850e (2023) comes out ahead in several specs, while the VERTEX GX-1200 wins on wattage / warranty. Overall, the RM850e (2023) scores 80.3 and the VERTEX GX-1200 scores 84.5 on our Mars Score.
Which should you buy?
The VERTEX GX-1200 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 RM850e (2023) 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 VERTEX GX-1200 if you care most about wattage / warranty. Its strongest claims are wattage, warranty. 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: Corsair - RM850e (2023) or Seasonic - VERTEX GX-1200?
Seasonic - VERTEX GX-1200 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 Corsair - RM850e (2023) if…
Corsair - RM850e (2023) does not lead a decisive measured field here, so choose it for price, ecosystem, design, or availability when those matter more to you.
Choose Seasonic - VERTEX GX-1200 if…
Seasonic - VERTEX GX-1200 has the measurable edge on wattage w, warranty years.
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 Corsair - RM850e (2023) wins
- No decisive advantages.
Why Seasonic - VERTEX GX-1200 wins
- ▲Wattage — 41.18% more. 1200 W vs 850 W.
- ▲Warranty — 5.00 yrs more. 12 vs 7.
Spec comparison
Spec
| Spec | Corsair - RM850e (2023) | Seasonic - VERTEX GX-1200 |
|---|---|---|
| Wattage | 850 W | 1200 Wlead |
| Efficiency | 80+ Gold | 80+ Gold |
| Form factor | ATX | ATX |
Features
| Spec | Corsair - RM850e (2023) | Seasonic - VERTEX GX-1200 |
|---|---|---|
| Modular | full | full |
| Average noise (Cybenetics) | 26.48 dB(A) | 25.41 dB(A)lead |
| ATX 3.0 / 12VHPWR | true | true |
| Warranty | 7 yrs | 12 yrslead |