Thanks for the replies everyone. It turns out I'm an idiot. When I removed 2/4 dimms, I didn't leave them in the slots that my motherboard liked, causing the instability. I moved them to the slots recommended in the manual and whadyaknow, my OC is fine again. Unfortunately I had already bought a...
Thanks for the suggestions!
I've cleared the CMOS multiple times while trying different memory speeds and there are no voltage abnormalities according to the BIOS.
A few weeks ago there was a power outage at my apartment. I was out of town at the time so I don't know any details, but the weather was good so I'm pretty sure it's not lightening. I know when the outage occurred because I use my GPU for mining when not using my PC. My PSU (EVGA Supernova G2...