Tocsin, I'm pretty sure my P4 isn't hyper threading enabled.
It's supposedly quiate a rare unusual P4 in that it also has an 800 FSB.
I took my lappie into a shop to get some additional ram in it, and he said that he had never heard of a P4 with an 800 FSB without having Hyper threading. That said the guy was a bit of a tool, so don't knowhether t belive him or not...

BombJack