BIOS is the latest. It's all happening in the BIOS. I increase the frequency there and am getting less and less memory available. Also dram spd shows all dimms are fine @ 800 hz. At 1333 2 are "abnormal" and so on. If all the dimms are fine @ 800 hz, it can't be a problem with either memory or mobo. Also, I noticed, when I delay/advance timings manually by, say, 2 it's actually delayed/advanced by 4. I've tried various manual timings adjustments but just can't get it right. I am stuck at 24 gigs and can't get past that mark. I've also noticed, that at 800 hz all the timings are identical, except for the d slots ("abnormal" ones, when frequency gets past 800 hz). DRAM IOL (CHD D1 R0) and DRAM IOL (CHD D1 R1) are displaying +1 to the rest.