Seasonic
Seasonic Vertex PX-1200
1200 W · 80+ Platinum · ATX 3.0
93
/ 100
From $289
VS
Seasonic Vertex PX-1200 wins by 4
Corsair
Corsair RM850e
850W · 80+ Gold · 12VHPWR
89
/ 100
From $139
Specdex verdict
Seasonic Vertex PX-1200 takes it — here’s why.
In our weighted Specdex score, Seasonic Vertex PX-1200 lands at 93 and Corsair RM850e at 89. That puts Seasonic Vertex PX-1200 ahead by 4 points — a narrow margin driven mostly by its strengths in the categories below.
Pick Seasonic Vertex PX-1200 if…
- ✓Rock-solid ripple
- ✓Platinum efficiency
- ✓Long 12-year warranty
Pick Corsair RM850e if…
- ✓Sub-$150 12VHPWR-ready PSU
- ✓80+ Gold + Cybenetics Gold
- ✓7-year warranty
Seasonic Vertex PX-1200 93
vs 89 Corsair RM850e
Score breakdown
Seasonic Vertex PX-1200
93 efficiency 96
noise 92
cables 90
value 86
build 0
features 0
Corsair RM850e
89 efficiency 92
noise 0
cables 0
value 96
build 90
features 88
Specs side-by-side
| Spec | Seasonic Vertex PX-1200 | Corsair RM850e |
|---|---|---|
| Wattage | 1200 W | 850W |
| Efficiency | 80+ Platinum | 80+ Gold |
| Standard | ATX 3.0 | — |
| Connectors | 1× 16-pin 12VHPWR (600W) | — |
| Cooling | — | 120 mm rifle-bearing fan |
| Modular | — | Fully modular |
| 12VHPWR | — | 1× 600W native |
| Warranty | — | 7 years |
Seasonic Vertex PX-1200
Pros
- +Rock-solid ripple
- +Platinum efficiency
- +Long 12-year warranty
Cons
- −Heavy at 2.6 kg
- −Expensive
- −Cables stiff
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
FAQ: Seasonic Vertex PX-1200 vs Corsair RM850e
Which is better, Seasonic Vertex PX-1200 or Corsair RM850e? +
Seasonic Vertex PX-1200 scores 93 on our weighted rubric — ahead by 4. Your best pick depends on the sub-scores above.
Is Seasonic Vertex PX-1200 worth the price? +
At $289, Seasonic Vertex PX-1200 delivers a Specdex score of 93 — strongest in efficiency.
Is Corsair RM850e worth the price? +
At $139, Corsair RM850e delivers a Specdex score of 89 — strongest in value.
Does Seasonic Vertex PX-1200 or Corsair RM850e 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.