PSU Calculator
Pick CPU, GPU and the rest of your build — the tool sums each part's draw and recommends a PSU tier with 1.35× headroom.
| Estimated load | 0 W |
|---|
Recommended PSU
— WHow the estimate works
- Listed parts use rated TDP/TBP (PL2 turbo for Intel CPUs, board power for GPUs); custom entries accept any wattage.
- The recommendation is the total load ×1.35 rounded up to a common rating — covering transient spikes, aging and the efficiency sweet spot.
- Motherboard, USB devices and misc. draw are folded into a fixed base of about 50W.
- A bigger PSU does not consume more power — it only delivers what the load asks for.
Frequently asked questions
Why multiply the total by a factor?
GPU transient spikes can exceed rated TDP by more than 2×, and running a PSU at full tilt ages capacitors and leaves its efficiency sweet spot. 1.35× headroom is the standard balance of stability and efficiency.
My CPU or GPU isn't listed — what now?
Choose Custom and enter watts directly: use the official TDP/PPT for CPUs and TBP (total board power) for GPUs — both are on the manufacturer's spec page.
How do I read the 550/650/750W tiers?
The recommendation rounds up to a common rated wattage. Example: 420W load ×1.35 ≈ 567W → a 650W unit. Bigger doesn't mean hungrier — a PSU only draws what the load asks, and larger units run quieter at mid loads.
How much extra for overclocking?
Ticking overclock raises CPU and GPU draw by 15% each. For heavy OC or power-limit-unlocked flagship cards, step one tier higher still.