Cheeky_Chris :
After playing BF4 for about an hour or so it freezes my entire PC and I am forced to to use the power button to power it off. This doesn't happnen in any other game. Is this yet another issue with the critically acclaimed BF4?
They break something new in every new release whilst occasionally fixing something, only to be broken later. It doesn't surprise me in the slightest that you have this issue.
A recoverable freeze is usually the GPU. Non-recoverable is usually the CPU/memory. Your signature says your I7 is o/c to 4.3GHz, is this not the case anymore?