I'm still trying to find the sweet spot, and I've got pc2700 ram only right now so I have to use a 3:2 divider and am not sure if the ram is what's holding me back or not, but my 2.6C is sitting on my machine somewhere around 3470 or so. As I mentioned, I can post and bench at up to about 3530 but haven't yet found the highest stable. 3450 was stable tho I think somewhere in between.