Well, so far what I've done is restore everything to default (still with latest bios and beta drivers), underclocked my CPU to 3300mhz and left the GPU clock at 925, but turned down the power limit by 8%.
I also discovered that before I do any of this, DayZ makes the computer crap itself within 30 seconds of loading into the menu, so thats my new testing software
Update:
5 Minutes in, it seems to be working Thanks for all the help everyone! I will run IntelBurnTest and Valley for a bit later and double check that its all good