Budman, Good find. I searched and couldn't find anything.
I especially got a kick out of page 8.
INTEL Pentium 4 3.06 Ghz HyperThreading 
By Samuel D./Franck D. - 14/11/2002 
Synopsis: 
Select a page: Introduction Configuration of test The core P4 with the magnifying glass Hyperthreading: Explanations Benchmarks: non-SMT Benchmarks: SMT Benchmarks: Plays Compatibility Hardware/Software Overclocking Conclusion 
Compatibility Hardware/Software 
To function correctly, Hyperthreading technology requires, according to INTEL, the following elements: 
Given rhythm Pentium 4 with 3.06 Ghz or + 
Chipset INTEL supporting Hyperthreading 
A BIOS supporting Hyperthreading 
An operating system which include optimizations for the HT 
Currently, the only OS including of optimizations for Hyperthreading is Windows XP. That it is in Home version or Pro, this operating system is able to benefit the best from the SMT. Etrangement, <<all the versions of Windows 2000 belong to the group " not recommended " (just like Windows Millenium or 98) and INTEL even suggests decontaminating Hyperthreading on these systems.>>
decontaminating? LOL