be quiet! Straight Power 12 750W vs Seasonic PRIME PX-850
Efficiency, ATX compliance, 12V-2x6 support, Cybenetics rating, and 5-year total cost of ownership.
| Spec | be quiet! Straight Power 12 750W | Seasonic PRIME PX-850 |
|---|---|---|
| Wattage | 750W | 850W |
| Efficiency Tier | platinum | platinum |
| 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 | $159 | $219 |
| Est. Annual Electricity Cost | $246/yr | $246/yr |
| 5-Year Total Cost (TCO) | $1389 | $1449 |
5-Year Total Cost of Ownership
Assuming 500W average draw, 8 hours/day gaming, and $0.15/kWh electricity:
be quiet! Straight Power 12 750W costs ~$1389 over 5 years (purchase + electricity), saving approximately $60 compared to Seasonic PRIME PX-850.
Frequently Asked Questions
Which is more efficient — be quiet! Straight Power 12 750W or Seasonic PRIME PX-850?
be quiet! Straight Power 12 750W is rated 80+ Platinum (~89% efficient), making it more efficient than Seasonic PRIME PX-850 (80+ Platinum (~89% efficient)). Higher efficiency means less electricity waste as heat, lower operating costs, and better thermal performance.
Can be quiet! Straight Power 12 750W run an RTX 5090?
be quiet! Straight Power 12 750W includes a native 12V-2x6 cable and supports ATX 3.1 — it is compatible with the RTX 5090, provided the wattage (750W) is sufficient for your full build.
Which has lower long-term cost?
At $0.15/kWh and 8 hours/day, be quiet! Straight Power 12 750W costs ~$1389 total over 5 years (purchase + electricity) vs ~$1449 for Seasonic PRIME PX-850 — a difference of ~$60.