disabled HT means CPU is less occupied with data to process. Hence less work is done (less W). Tat's y u see 2C drop in yr CPU.

W = I x V, where I is the current and V is the voltage.

for a fixed vcore, if W drops, current sure drop ma. PWM is in charge of supplying current into CPU. If less current, PWM oso has less load, so temperature drop oso lor.

erm... ok. it's not really appropriate but i try to use this to illustrate.

dual core has, 2 control units and 2 functional units (for add, sub, sse, logic n watever). HT system has 2 control units and only 1 functional unit.

Tat's the reason y windows can see 2 processors when u open process tab.
Actually P4 architecture cant fully utilize the functional unit. It is quite inefficient when there's one control unit only (a.k.a. no HT). The control unit #1 is pretty bz although functional unit isnt at full force working. That's where it saves some power lor. Hope u get wat i mean

This post has been edited by charge-n-go: Mar 28 2006, 02:29 AM

LOL. well, as leadaxer said it might give slight boost in clock, but totally not worth bcoz u lost the double thread processing ability

True True !