Don't hurry please, you don't know something. Here
viewtopic.php?f=25&t=60324#p674894 I tell about MSR tuning in DOS. This tool can work with Core 2 too. It can change multiplier alive (like in Windows) - registers 194h, 199h - and activate CPU throttling - register 19Ah. Later I'll find link (I'm not at home now) and make a topic about this. Also I'll tell you about tool for P-2/3/Core which can disable separately L2 and L1 (and enable of course) without entering BIOS setup.
So, if we do follow:
1) FSB 100-133-166 via BSEL mod or via BIOS if supported
2) multiplier 6-8 via DOS MSR Editor
3) CPU throttling 12,5% via DOS MSR Editor
4) L2+L1 both disabled via DOS Cache Control
5) throttle 4 -c -- no comments, 50% chipset throttling
- steps 2-5 in one batch file - and get about XT performance. For the first time you can tune parameters finely, get wished speed and save it to batch files named XT.BAT, 386DX.BAT, P2-400.BAT etc. At home I got 1,04 XT (CHECKIT) or higher or even lower.
Be a little patient, I'll find it soon and show in individual topic.