From reading the post, it sounds like you swapped out the cpu and left the OS intact. I would probably re-install the os. The linux 64 is a good idea!
I know -- I've quoted myself here. You see . . . , I have to take that statement back. This evening I dropped an AMD Athlon 64 4000+ into a spot that was occupied by an AMD Athlon 64 FX-60 Dual Core a few days ago.
It's running just fine, albeit a little slower and less powerful. It's crunching Edges@Home right now.
All I did was start the computer up. Boot up was a little slower. I have to change the memory clock. Right now it's DDR 320 instead of DDR 400. I made no changes to any configuration, bios -- not anything.
Everything appears to be fine. Go figure. Now I feel a little ashamed for what I said earlier.
Still -- I'm one of those people that reloads the os if there's something going on that just can't be explained in any other way.
What if it does take an hour? . . . , and then sp2 and sp3 -- and all those updates! and reloading all the essential programs that you must have.
Man -- I know it can all be done in a day or two. . . . , and then you would know. I'm not sure what you would know, but YOU WOULD KNOW!!!
you know what I mean man?