GTA 4 is still kinda buggy, even with the 2 patches. Mine freezes, but only about once every couple of days or so. It could just be a bug in the game.
Also GTA 4 puts a good deal of load on the CPU, so if your CPU Overclock is not *quite* stable, then it might run some less CPU dependent games fine but freeze in others.
What program are you stress testing the CPU with and how/how long are you testing?
And are you OCing your 9800GTX+? (doesn't say in your sig) Your GPU OC could be causing the PC to freeze.
Also GTA 4 puts a good deal of load on the CPU, so if your CPU Overclock is not *quite* stable, then it might run some less CPU dependent games fine but freeze in others.
What program are you stress testing the CPU with and how/how long are you testing?
And are you OCing your 9800GTX+? (doesn't say in your sig) Your GPU OC could be causing the PC to freeze.