this post was submitted on 13 Jul 2025
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Consider undervolting cpu and gpu and you will be able to get away with a leaner psu. I always do this and there really is no downside if you overclock the gpu a little to compensate for the undervolting. Your system will run cooler as well often stopping cpu/gpu from throttling down, so with a bit of luck you can even gain performance while saving on power. It depends on the cpu/gpu combo, but you can expect to save around 50 Watts under full load with both components properly undervoltet.
Here's a very good guide for undervolting your gpu under windows, it's meant for nvidia gpus but the process is very similar with amd gpu's and/or under linux.
https://github.com/LunarPSD/NvidiaOverclocking/blob/main/Nvidia%20Overclocking.md
Overclocking usually requires overvolting to keep things working. Underclocking though, is a good way to gain stability.
That's how it used to work, but modern GPUs pretty much auto-overclock based on their assigned power target. Undervolting traditionally would mean less power at the same clock. But modern GPUs would just see more power available in the budget to boost clocks further instead. At least in most cases. If you go extreme enough on the undervolting it may hit a point where it won't boost clocks anymore and actually start reducing power consumption.