Recently RMA'ed my ram in my sig cause i fried it playing around with the voltage. That ram was fine running 254@ 2.5-2-2-5 but the ram i recieved (same ram type) cause errors with those timings. so the question is leave it at 2x200mhz running tight timings or 2x254mhz at a looser timing that i haven't found yet. I tried 2.5-3-3-6 and that was still a no go. I use memtest85+ for windows to test the ram.