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""Performance in games is variable and strangely does not improve when the settings are turned to minimum. I am thinking that maybe the PSU is not delivering enough current or voltages are unstable or something.""
The power from the PSU can not affect the speed of the card only the stability.
If you get random shutdowns, gfx artifacts and the like it could be your new PSU however the variable performance you describe sounds like it is not related to power.
You can see the voltages on each rail in the bios of your MB or with a monitoring program in windows.
My guess is that some other issue is affecting the performance of your PC - What game are you testing with?
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