Corsair
Corsair RM850e
850W · 80+ Gold · 12VHPWR
89
/ 100
From $139
VS
Seasonic Vertex PX-1200 wins by 4
Seasonic
Seasonic Vertex PX-1200
1200 W · 80+ Platinum · ATX 3.0
93
/ 100
From $289
Specdex verdict
Seasonic Vertex PX-1200 takes it — here’s why.
In our weighted Specdex score, Corsair RM850e lands at 89 and Seasonic Vertex PX-1200 at 93. That puts Seasonic Vertex PX-1200 ahead by 4 points — a narrow margin driven mostly by its strengths in the categories below.
Pick Corsair RM850e if…
- ✓Sub-$150 12VHPWR-ready PSU
- ✓80+ Gold + Cybenetics Gold
- ✓7-year warranty
Pick Seasonic Vertex PX-1200 if…
- ✓Rock-solid ripple
- ✓Platinum efficiency
- ✓Long 12-year warranty
Corsair RM850e 89
vs 93 Seasonic Vertex PX-1200
Score breakdown
Corsair RM850e
89 efficiency 92
build 90
features 88
value 96
noise 0
cables 0
Seasonic Vertex PX-1200
93 efficiency 96
build 0
features 0
value 86
noise 92
cables 90
Specs side-by-side
| Spec | Corsair RM850e | Seasonic Vertex PX-1200 |
|---|---|---|
| Wattage | 850W | 1200 W |
| Efficiency | 80+ Gold | 80+ Platinum |
| Cooling | 120 mm rifle-bearing fan | — |
| Modular | Fully modular | — |
| 12VHPWR | 1× 600W native | — |
| Warranty | 7 years | — |
| Standard | — | ATX 3.0 |
| Connectors | — | 1× 16-pin 12VHPWR (600W) |
Corsair RM850e
Pros
- +Sub-$150 12VHPWR-ready PSU
- +80+ Gold + Cybenetics Gold
- +7-year warranty
Cons
- −Single-rail design (mostly fine)
- −Cables ribbon-flat (some prefer round)
- −No iCUE Link
Seasonic Vertex PX-1200
Pros
- +Rock-solid ripple
- +Platinum efficiency
- +Long 12-year warranty
Cons
- −Heavy at 2.6 kg
- −Expensive
- −Cables stiff
FAQ: Corsair RM850e vs Seasonic Vertex PX-1200
Which is better, Corsair RM850e or Seasonic Vertex PX-1200? +
Seasonic Vertex PX-1200 scores 93 on our weighted rubric — ahead by 4. Your best pick depends on the sub-scores above.
Is Corsair RM850e worth the price? +
At $139, Corsair RM850e delivers a Specdex score of 89 — strongest in value.
Is Seasonic Vertex PX-1200 worth the price? +
At $289, Seasonic Vertex PX-1200 delivers a Specdex score of 93 — strongest in efficiency.
Does Corsair RM850e or Seasonic Vertex PX-1200 last longer? +
Based on our long-term update and support ratings, both ship with multi-year support. Battery and reliability scores are visible in the breakdown above.