I have used also a KT400 board back in the day. It was my XP maschine for a long time. 😀
It's only a matter of time that i'll rebuild it. The only two open points are, to recap the board cause it's capacitor quality is not good anymore after 13 years 😵
I had a XP 2100+ (T-Bred B) and i was very satisfied with it.
Due to it's manufacture week (03/03), i was able to select the multiplier from 10 x (133Mhz) = XP1500+ (1333MHz) up to 13 x (166MHz) = XP2700+ (2166MHz).
Every setting inside the PCI / AGP specifications and also with default 1.65V.
So with an XP-M or XP with unlocked multiplier you can also have a wide range of frequencies.
#1 K6-2/500, #2 Athlon1200, #3 Celeron1000A, #4 A64-3700, #5 P4HT-3200, #6 P4-2800, #7 Am486DX2-66