Free PC upgrade tool

PSU Headroom Calculator

Estimate whether your current power supply has enough margin for a GPU or CPU upgrade. Use it as a planning check before the full configurator.

Start full configurator Read the PSU guide
CPU class
GPU upgrade class
Target headroom

Result

Enough headroom

Your 650W PSU has room for this class if the unit is good quality and the required cables are available.
Estimated load 388W
Recommended PSU 500W
Current headroom 262W
Headroom ratio 68%
  • Efficient CPU · Ryzen 5 / Core i5 non-K is estimated at 85W for planning.
  • RTX 4070 class is estimated at 220W for planning.
  • Storage, fans, motherboard, and USB devices add about 83W.
  • The selected target headroom is 25%, so the rounded recommendation is 500W.

Sources and assumptions

  • CPU and GPU wattages are conservative planning profiles, not exact benchmark measurements.
  • Motherboard, USB, fans, and drives are included as a small fixed planning overhead.
  • Always verify the exact PSU model, cable count, age, and GPU vendor guidance before purchase.
  • This route does not read from D1; it is deterministic public UI logic.

FAQ

Is this a guarantee that my PSU is safe?

No. It is a planning estimate. Confirm the exact PSU model, age, cables, manufacturer guidance, and GPU vendor requirements before buying.

How much PSU headroom should I target?

20-30% is a useful planning range for mainstream gaming PCs. High-end GPUs, older PSUs, overclocking, and unknown cable quality justify more margin.

Does efficiency rating change wattage?

Efficiency rating does not turn a 550W PSU into a 650W PSU. It mainly describes wall-power efficiency at different loads.

CPU/GPU Pairing Checker Check whether the rest of the build fits the GPU upgrade.PSU Headroom Guide Understand power margin, spikes, and replacement timing.Full configurator Build the complete upgrade path with workload, budget, and compatibility context.