Ok, Im getting random lockups, my PC will just lockup completely, requiring a hard reset, I've messed with most voltages and I know the CPU is stable (It's done 10 hours prime bland @ priority 9). For instance I got a lockup tonight after uninstalling drivers and rebooting and it happened as things were loading and I had started to install the Catalyst Software for my GFX. The other day It locked up as I browsed the web. These lockups seem to be pretty rare and only happens around once a week sometimes longer!, can anybody help?, what normally causes a hard lockup? no BSOD or anything?. Any suggestions appreciated, its not a massive issue but I'd rather know the cause 
