Hehe got me a mobile XP 2400 and here's the info from the codes:
AXMH: Athlon XP Thoroughbred/Barton Mobile 45W
2400: 2000MHz clock speed
F: OPGA w/ FSB Auto detect
Q: 1.45v Vcore
Q: 100¢ªC max temp
4: 512K cache
C: 266MHz FSB
Slapped in in my Lanparty NF2Ultra and it POSTs 2.4Ghz default volts (1.55V in the mobo) me will play some more with this I think.....
UPDATE:
Had a play now on a spare 98SE hard disk:
This default volts (1.55V actual):
Seems to top out there and need voltage hike for 2.4Ghz (1.7V):
2.3Ghz may need a tweak to make it 100% stable, but 98SE is more flakey than XP Pro, so it's probably fine @ 2.3Ghz 1.55V and sensible (read quiet!) air cooling
2.4Ghz is doable on air but not really worth the extra hassle I reckons.
Cooling was with a TT volcano7+.
Cheers,
MM