More than the processor, to a point, memory will have a greater impact on
performance for XP. I am running XP Pro on a PIII 600-E with no trouble at
all. That includes Office 2003 apps, Outlook 2003, and FrontPage 2003. It
all seems reasonably responsive.
I have 384MB of RAM in my system, and I feel that would have to be the
minimum required for the best XP performance, which you would want with
slower processors like mine.
- carl