I think, i maybe found a sweet spot at 460FSB for the CPU - this means no lockups(for 1 hour 30 min). BUT( there is always but) i got after 1 hour 30 minutes "Final result was *******, expected *******" on core #3 in Prime95 Small-FFT. Ran Memtest, as i expected - errors (not mass errors, but ofter 3% 1,2 errors). Last time i had this problem(there was mass error, no just from time to time) 67x NB GTL fix it, but now it's the same on 67x and 63x. DRAM Controller to DDR2_REF -10mV doesn't help, high vNB too. My 8800PC are to 1105 with 1.90* real, so i don't think they are the problem. PL is 7, which i think is not the problem too. Any ideas?

I forgot - the problem causes BSOD too with 0x0000101 or 0x0000124.