What chip in put out in the last 2 years or so couldn't run a 64 bit system? I'm pretty sure most of the AMD chips could... Edit: By chip I mean one for a desktop CPU, e.g. Atom don't count.

IDK if it's relevant, but 64bit can seriously suck also. If you use a lot of pointers, you just doubled the memory you need for each pointer.

In my experience, 64bit isn't a good way to save memory.