I have only used the Kingston 1066 Ram, but found it to be a problem when overclocking. Ironically, the fix was to use PC800 Ram at 3x. I think the reason for this is that, notwithstanding the multiplier you manually select in the bios for the Ram, i.e., 800 vs 1066, the board runs 1066 Ram at 4x. Consequently, you may not be able to OC to the extent you may otherwise be able. I'm not sure, if it is due the Ram, e.g., it may be registered or the board itself. At the end of the day, however, the board is solid, stable and has a fairly good set of OC options.