Just picked up a pair of the 1gigs today and can't seem to get over ~425MHz at 1.85-2.20V in bios with 4-4-4-12 timings. Tried bumping the timings to 5-5-5-18 to rule them out and only achieved ~455Mhz. How much voltage can these things take before it is unsafe? I'll try 2.3 and 2.4V later today.