Seasonic PRIME PX-850 vs Corsair RM850x (2024)
Efficiency, ATX compliance, 12V-2x6 support, Cybenetics rating, and 5-year total cost of ownership.
| Spec | Seasonic PRIME PX-850 | Corsair RM850x (2024) |
|---|---|---|
| Wattage | 850W | 850W |
| Efficiency Tier | platinum | gold |
| ATX Version | ATX 3.1 | ATX 3.1 |
| 12V-2x6 (RTX 5090 safe) | ✓ Yes | ✓ Yes |
| Modular | full | full |
| Cybenetics Rating | ETA-A+ | ETA-A |
| MSRP | $219 | $139 |
| Est. Annual Electricity Cost | $246/yr | $252/yr |
| 5-Year Total Cost (TCO) | $1449 | $1399 |
5-Year Total Cost of Ownership
Assuming 500W average draw, 8 hours/day gaming, and $0.15/kWh electricity:
Corsair RM850x (2024) costs ~$1399 over 5 years (purchase + electricity), saving approximately $50 compared to Seasonic PRIME PX-850.
Note: Seasonic PRIME PX-850 has higher efficiency but higher upfront cost. The TCO crossover depends on your electricity rate and usage.
Frequently Asked Questions
Which is more efficient — Seasonic PRIME PX-850 or Corsair RM850x (2024)?
Seasonic PRIME PX-850 is rated 80+ Platinum (~89% efficient), making it more efficient than Corsair RM850x (2024) (80+ Gold (~87% efficient)). Higher efficiency means less electricity waste as heat, lower operating costs, and better thermal performance.
Can Seasonic PRIME PX-850 run an RTX 5090?
Seasonic PRIME PX-850 includes a native 12V-2x6 cable and supports ATX 3.1 — it is compatible with the RTX 5090, provided the wattage (850W) is sufficient for your full build.
Which has lower long-term cost?
At $0.15/kWh and 8 hours/day, Corsair RM850x (2024) costs ~$1399 total over 5 years (purchase + electricity) vs ~$1449 for Seasonic PRIME PX-850 — a difference of ~$50.