Hi!
Despite the fanct that you could run you XP at 100FSB you still cannot put it into the KT7.
The problem is because the AMD changed the initialization timings for XP that come from the MB when it initializes the CPU (boot time).
Only the KT7A revision 1.3 with updated 65 bios revision can use those CPU's well.
You still can use regular athlons up to 1.4 on that board. Look into the faqs to see how to achieve stability with these too(it requires an bios update...).
For more info please take a look in this faq that will explain it better.
FAQ. And
hereis what you wanted to know.
Cheers,