Thanks for the correction. Sry I was not clear and sure before. Thought that it was the CPU voltage. It looks like its the 3.3V rail that was dropping (correct me again if I'm wrong)
It's when it dips to 2.8v that it shuts down. The only way that I could get back onto the bios was by resetting the CMOS. Which then buys me about a min or so before shutting down again. Weird thing is, I let I rest for and hour and is was running fine again for the next few hours before crashing again.