High CPU temps with HT turned off?!

There is a piece of hardware in my system that does not like hyperthreading, so I recently turned it off.  To my surprise, the CPU temperature went up by 8-10 C!!  Shows up in powerfan, and in the system temp readings in the setup screen, so I think the temps are real.  Any idea why such a dramatic temp increase??

My hardware live in a harmony.... . I read somewhere, I'd be able to increase FSB, if "HT" is disable.... . I did it, but I achieved nothing, but high temps (idle 47"C very stable )? Then, I was shocked and turned on "HT"?
I guess it is because when HT is off, the CPU is more loaded..... , but I am not sure ?

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