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 61.1 and the VERTEX GX-1200 scores 77.5 on our Mars Score.
Which should you buy?
The VERTEX GX-1200 is the clear pick on raw spec strength, leading by 16.4 points on the Mars Score. The margin is wide enough that the underdog only makes sense if its individual strengths line up with what you specifically need.
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.
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: the VERTEX GX-1200 is the safer default. The other model is the right choice only when its specific advantages line up with your priorities.
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 |
| ATX 3.0 / 12VHPWR | true | true |
| Warranty | 7 yrs | 12 yrslead |
Spec-level deep dives
More from the same brands
vsMars is reader-supported. When you buy through links on our site, we may earn an affiliate commission at no extra cost to you. Learn more.