game was crashing on the x86 machine because of memory issues. after installing the extra gig (as much as the 32bit could address) and re-enabling my hdd page file (set to 512 - 1024 on non-primary disk) Crysis is working just fine now, which is good

now just going to have to fuddle around in the 64bit os and see whats causing this weird lag.
Arch your probably right about a too agressive overclock for the new 64bit OS, the only thing else that i can think of is a driver that i missed or installed incorrectly.
haven't even tried installing much of anything on the 64bit other than firefox, and a few monitoring tools, let alone something as intensive as crysis yet.
so off to the land of Oz again