HI, The way I understand HT, as far as the Intel Desktop CPU's are concerned: None in 400mhz support HT In 533mhz bus the 3.06 northwood is the only one. In 800hmz, all "northwood and prescott" support HT. All new LGA775 will support HT Thanks and have a Great Day! Joe Lore ==================== Ok, I have a question, what is the difference between the P4 2.4 Northwood core and the others? I just want a good chip. Also if the chip is Hyper-threading enabled, does the motherboard have to be also? The motherboard I have is the Biostar P4SXQ currently running a Celeron on it but can support up to a P4 2.4 Doesn't mention anything about H/T, so I have no clue if it would work on my board at all. Please advise soonest! Ron Delvecchio The NOSPIN Group is now offering Free PC Tech support at our newest website: http://freepctech.com