To be honest though, I'm not certain it is the Gpu, but what happens is my screen just goes blank and I can't get back to my desktop, so I thought it must be.
There doesn't seem to be any change to the computer itself though, no unusual noises and all the fans remain at their previous fan speed (as far as I can tell by ear anyway).
I'll try to get a temperature reading from my Cpu when its under load but I think its alright.
Here's my NVIDIA Monitor:
