I want to do the Northwood 1.6a overclock and would like to choose a mobo that locks the PCI/AGP in spec (I feel this would give the most stable system), but after reading all the posts I'm still not clear which boards allow this. Also, can the PCI/AGP be locked at all FSB speeds or only at certain FSB speeds? I don't really care which chipset I end up with (645 or 845) it will be time to upgrade in 6 months anyway.