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  • I don't think that a PSU with not enough power will harm your GPU. The PC will just turnoff in case of too high power demands (which will be annoying, but won't do damage).
    – zx485
    Commented Feb 13 at 18:02
  • 1
    Depends on the quality of the power supply. I've had a more powerful PC work for years with only a 325W power supply. If it's the cheapest PSU you can find I'd give it anywhere from a fairly large margin for error and be assuming that it can only supply 150W when rated at 300W.
    – Mokubai
    Commented Feb 13 at 19:25