This is my first post sorry if it is in the wrong area please let me know and I'll move it or a forum mod can move it or however it works.
My PC is underperforming and wildly varying on benchmarks
Benchmark 1: https://www.userbenchmark.com/UserRun/20948963
Benchmark 2: https://www.userbenchmark.com/UserRun/20949289
Benchmark 3: https://www.userbenchmark.com/UserRun/20950529
I wonder if this could be due to my power supply as it only seems to start slowing down when the load builds up, I have a cheap 500W Xilence PSU
Speccy report for my PC: http://speccy.piriform.com/results/RbMPPaqowV03ifC6m1WFhcM
Thank you for any help, and if anything might need replacing please recommend parts that are affordable and decent enough quality, thanks.