I am trying to improve my understanding of i7 relative to cpu speed, hyper threading, vcore and the resulting temperatures.
This little experiment was executed on a 965, ggbt extreme mobo - on an open case (tech station) with water cooling (so, note – YMMV).
Starting with the cpu at default speed – 3.2ghz – the average temp under load is 46C.
Moving up to 4.0 HT on – the temp under load increases to 54-55.5C, depending on the cpu mutliplier selected.
Moving up again to 4.2 (close to the max this i7 can do) the average temps under load climb to ~75.4C.
Interesting to note then that the increase in speed from 3.2 to 4.0ghz costs ~8-9C, while the increase from 4.0 to 4.2ghz costs another 20C!
Another observation is comparing hyper threading on to hyper threading off.
At 4.2ghz, (remember - under water) the temp differences appear to be ~3C, HT off being less stressful.
Interesting that the difference was not as pronounced at 4ghz.
The last observation is that C1E seems to have more effect at higher multi/lower bclock (in lowering temps).
I suspect this might be due to C1E lowering the multi while keeping the bclock constant.
This can be seen in the realtemp 2.90 display when at idle.
That is all.
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