Hi, I've used HT for a while on my 3.0 P4 - I like the way it helps you multi-task better by not letting one program nick all of the CPU power. It's especially useful when one program crashes - it can only max-out one half of the CPU (if you've set the affinity correctly). That's great, but is it counter-productive on an overclocked system? If you've raised the FSB to increase the CPU speed, by 400MHz (for example) your programs will only see a 200MHz boost (unless they are designed for HT / multiprocessor - which none of mine are!) What are people's thoughts on this? Is it best to turn the HT off so your programs / the OS can enjoy the fruits of your overclocking? Do I have the wrong end of the stick? - Toff.