well, only apps that are 64bit would get a benifit, but changing the size of int isn't the only thing AMD is doing for the chip, arn't they using HyperTransport and giveing it 16gp registers instead of the x86 standerd of 8? doesn't that make it more scalable becuase of the way the bandwidth is distributed to and from the proccossr, correct me if im wrong?. however things like filesystems and databases and anything else that uses large address spaces will get a big boost. and native memory limits will be much higher, even though the xeon can see somewere arount 64gig's of ram, it does this by segmenting the ram which is not optimal. however, a 64bit chip can see oodles of ram, i don't know off the top of my head how much, but its a lot.
