I am currently running my xp2100+ at 1.75mV , 133FSB---->1.73gHz. I lowered the vCore to 1.725 and the temps droped by about 2*C everything seemed to work fine but I didn't really do anything heavy in these settings yet. Do you think it will hinder the performance if I keep it on 1.725? Also what is your experience with fan adaptors? I am thinking of getting a 80mm fan for my hs.