I have a Z77 Extreme 4. The bios are the latest. I do have xmp 1.3 on. 4 DIMMs is 4 memory slots? I have two 8GB sticks. in dual channel. Both at 1600 but the voltages are slightly different: one 1.35 and the other 1.5, I think. I don't really know what I'm doing with voltages, so I haven't changed anything yet on the RAM or the cpu. Also, the SSD has the latest firmware. Is there any voltage setting I should change, and if so, which one? I think the supply works because I haven't had any trouble with other games such as Crysis 1, Crysis 2 and Starcraft II.
I just checked my GPU usage with the game as well and it hovers around 99% and the temp gets to 75C max. Could that be the problem?