Not sure if this helps but its worth bearing in mind that Oblivion will stress a lot more of your system than Prime will. Whilst Prime might max the CPU out, everything else in your system is basically just sat there idle - there's no mad IRQ interrupts going on constantly between the graphics card, sound card, hard drives and CPU as there would be in Oblivion (or any taxing game).

Ordinarily I would say that the fact it falls over in Oblivion is due to lack of power - but I'm sure your Enermax Liberty 620W is up to the job.

My current (in the process of being decommissioned) P4 system was rock solid stable at Prime at 4Ghz, but if I started playing BF2 for long periods of time I'd occasionally get strange errors and lockups.

Quote Originally Posted by Devious
Maybe the strain on the system with some games causes major vdoop ?
That's certainly a possibility.