The PCI bus <> CPU bits
The PCI bus itself is only 32 bits in consumer machines. This has no bearing on the CPU, which can run 64-bit Windows fine. They refer to completely different things.
Honestly, if I were you, I'd run XP on that P4 and get a new PC with 7. 7 will run, and I have run Vista on a similar machine, but I'd recommend 7 for a newer multicore PC.
|