Corsair RM850e
850W · 80+ Gold · 12VHPWR
Seasonic Vertex PX-1200
1200 W · 80+ Platinum · ATX 3.0
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
Winner by scenario
Derived from the sub-score breakdown · not a separate testEfficiency
Seasonic Vertex PX-1200Compared on the efficiency sub-score
Seasonic Vertex PX-1200 leads on efficiency (96 vs 92).
Value for money
Corsair RM850eSpecdex score per dollar at MSRP
Corsair RM850e more score per dollar ($139 vs $289).
Score breakdown
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
- +Sub-$150 12VHPWR-ready PSU
- +80+ Gold + Cybenetics Gold
- +7-year warranty
- −Single-rail design (mostly fine)
- −Cables ribbon-flat (some prefer round)
- −No iCUE Link
Seasonic Vertex PX-1200
- +Rock-solid ripple
- +Platinum efficiency
- +Long 12-year warranty
- −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.
Which is better for efficiency, Corsair RM850e or Seasonic Vertex PX-1200? +
Seasonic Vertex PX-1200 — leads on efficiency (96 vs 92). Compared on the efficiency sub-score.
Which is the better value, Corsair RM850e or Seasonic Vertex PX-1200? +
Corsair RM850e — more score per dollar ($139 vs $289). Specdex score per dollar at MSRP.