I think the PSU may e a good guess. But, if you are overclocking, stop. Go into bios and set optimized defaults and only change the items needed such as boot order and sata controller. Bios will also tell you the voltages it is reading from the PSU. Let us know what they are. But, even so, it does not tell what the voltages are when the system is under strain. If you have another PSU or have somewhere you can borrow one, you could try that. I wouldn't spend money on a new PSU unless I was relatively sure that is the problem. Ram can also be the issue. Here is an excellent tutorial on testing ram
. I would let it run overnight or until you see errors. Make sure all your drivers
are updated. Try those things and post back.