OK, I've read previously on this thread that the default memory subtimings are too tight for ram speeds above 1333 and need to be loosened. I've loosened, and loosened, and loosened both timings and subtimings to ridiculous levels, but I am not able to boot with ram at 1600 or 1800 no matter what I try. I've tried two different sets of DDR3 1800 sticks (Corsair and Cellshock). I know the ram sticks are good because they worked great in a prior P5K Deluxe board. I've also tried all the different available bios versions, and vdimm up to 2.1 (spec is 2.0 and 1.9 for these ram sets respectively). Is there anything else I should try or is time to banish this board to the folding farm and bring my nice P5K back to the starting team?