So you tried a local file with OC, and you had problems?
Then you tried a local file without OC, and had issues?
My impression was that when you played from PowerISO, it was crashing then. But every file (local or ISO) crashes on the OC, and none (local nor ISO) crash without the OC, right?
I really don't know what about the PCIe bus frequencies...never messed with it. What's the default for it? Is PCIe O/C'd a further % than your FSB?
BTW are you sure it wasn't the dual-core patch? Try OCing with the patch and see if it happens. Do the exact same thing you did where it played flawlessly w/o O/C.