Before you just jump on it being the PSU, you should do some testing on other components. Like I said previously, look into and run memtest, chkdsk, etc. to see if you can pinpoint what exactly is failing. There's no point in replacing the PSU if it isn't the part that's failing. Also, the PSU you want to get is dictated by the peak power draw of your computer, not the games you want to run. Most single-GPU systems are good at 500+, while dual-GPU are safer to be in the 650+ range (Usually. Hard drive, CPU, Mobo, RAM, and other PCI cards and peripherals factor into your peak power draw.) As for brands, I would strongly suggest either Seasonic or Corsair (Corsairs are actually just rebranded Seasonics.)