Well i've been running my rig oc'd to 3GHz for... oooh... 9 months? on stock voltage. So I got some spam email as per usual from a company called Maplin, they do electrical components and stuff. Anyway they're doing this amazing offer on a 500GB USB External HDD for £70 so I went out and brought me one. It's awesome btw. I got home, plugged it in, it works great. Next morning, I boot my pc and just as it gets to my boot loader it reboots and resets my bios as if it attempted to boot and it wasn't stable, so the mobo reset to settings that definately work. I thought "hmm it's early - maybe i'm seeing things." - ramped my OC back up and carried on as normal, all was good. Stable as ever. This morning, day 2, I booted and EXACTLY the same thing happened again. Had to ramp my OC back up again. So what do you guys reckon? External HDD being sh1tty, or suddenly my OC is unstable?