The power supply (PSU) is the quiet hero of a gaming PC — it feeds every component and shields them from electrical trouble. A quality unit means stable, efficient delivery and long life. By 2026, ATX 3.1 PSUs with native PCIe 5.1 (12V-2×6) connectors are essential for modern RTX 5000 GPUs. Here are the best gaming power supplies.
Quick answer: For most people in 2026, the best power supply for gaming 2026 is the Corsair RM850x (2024) — our #1 rated choice. See the full ranked comparison, alternatives and buying advice below.
Best Gaming Power Supplies of 2026
Power Supply Comparison Table
| PSU | Wattage | Efficiency | Standard | Price |
|---|---|---|---|---|
| Corsair RM850x (2024) | 850W | 80+ Gold | ATX 3.1 | ~$140 |
| Corsair HX1000i | 1000W | 80+ Platinum | ATX 3.1 | ~$220 |
| be quiet! Straight Power 12 | 850W | 80+ Platinum | ATX 3.1 | ~$160 |
| Corsair SF750 | 750W | 80+ Platinum | SFX (ATX 3.0) | ~$160 |
| Seasonic Focus GX-1000 | 1000W | 80+ Gold | ATX 3.1 | ~$180 |
Best Overall: Corsair RM850x (2024)
The Corsair RM850x is the best PSU for most builds. With 850W of fully modular, 80+ Gold power, ATX 3.1 compliance, and a native 12V-2×6 connector for RTX 5000 GPUs, it covers everything a modern rig needs. The quiet fan, excellent build, and 10-year warranty make it a reliable, no-worry choice.
Best High-Wattage: Corsair HX1000i
For high-end builds running an RTX 5090, or anyone who wants maximum headroom, the Corsair HX1000i delivers 1000W of 80+ Platinum power with digital monitoring through Corsair iCUE. Premium components, near-silent running, and the muscle to feed the most demanding builds make it the pick for flagship systems.
Best Quiet PSU: be quiet! Straight Power 12
True to the name, the be quiet! Straight Power 12 runs near-silent with 80+ Platinum efficiency and ATX 3.1 compliance. High-quality components and excellent voltage regulation make it ideal for silent builds where noise is the priority.
How Much Wattage Do You Need?
Match your PSU wattage to your components with headroom:
- RTX 5060 Ti / RX 9060 builds: 650W is sufficient
- RTX 5070 Ti / RX 9070 XT builds: 750-850W recommended
- RTX 5080 builds: 850-1000W recommended
- RTX 5090 builds: 1000W+ recommended for safe headroom
It’s smart to leave 20-30% headroom over your system’s peak draw for efficiency, longevity, and future upgrades.
Why ATX 3.1 and PCIe 5.1 Matter
Modern RTX 5000 GPUs use the 12V-2×6 connector (an improved take on 12VHPWR). An ATX 3.1 PSU with a native 12V-2×6 cable delivers clean, safe power and absorbs the transient spikes these GPUs produce. Going ATX 3.1 spares you messy adapter cables and improves reliability with the latest GPUs.
Efficiency Ratings Explained
80 PLUS ratings track efficiency: Gold (87-90%) is the sweet spot for most builds, balancing cost and efficiency. Platinum (90-92%) brings better efficiency and often quieter running for premium builds. Higher efficiency means less wasted power, less heat, and lower electricity bills over time.
