skora wrote : If you can get one of the 800mhz CPUs, it may do a little better than the 533mhz, but not sure if you'll really notice that much difference, especially if the ram is the slower 266 or 333 anyway. For the age of the system, I'd try to find the fastest, cheapest CPU for it. EDIT to your second post: If the docs say it should, then it should. You'd have to contact HP to know for sure...