I know there is a socket 478 =), there is no socket 478 mobo w/ pcie...
Well thats what I was saying I wasn't sure if there was a PCI-E board for socket 478, but also I know nothing of Intel
But no way, PCI-E doesn't smoke yet, it hasn't been fully adapted into the computing scene. It's not even worth the bucks yet. Get any PCI-E based graphics card right now and put it up against an AGP card of the exact same make and model and you will see little to no difference in speed. I want (need) the latest in tech and at this point I wouldn't even buy a 64 as right now it's not fully utilized and my 2.7GHz XP-Mobile can beat out a 64 3500+ in the sisoftware sandra arithmatic and multimedia cpu benchmarks. It's the simple fact that the things aren't fully utilized but yeah here in a few months PCI-E based boards with the new chipsets and cards will be blazing. The only thing going for 64 bit systems is that they'll last a lot longer than my XP mobile when something like windows64bit comes out fully made and stable