First place I usually start with something similar is to make sure all voltages are correct in the BIOS, especially with overclocked RAM. DDR3 voltage spec is 1.5 volts, a lot of manufacturers cheat the overclock by increasing latency but also increasing their voltage spec to 1.6 or 1.65, ensure you're where you need to be. Then I would try something like Memtest to make sure the RAM throws no errors; just because it boots up and runs doesn't mean that the RAM is entirely good to go. Have you overclocked you CPU already? Lastly, that power supply isn't considered low-quality by any means, but check the voltages on the three rails (at load would be preferably if you get that far); you definitely have a large enough power supply for the job. That should get you started.