Water Temps/Clocking

Netvyper

Netvyper

Netvyper

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Joined
28 Oct 2002
Posts
534
Location
Taunton, Somerset
Just started pushing my CPU a little harder; increased voltage to 113%, and FSB to 266, giving me a 2.66ghz Core speed on my 3800X2.

The core temp, under a D-Tek fuzion block is around 25'c idle; but under load, it jumps immediately to around 45-50'c... Im talking in less than 5 seconds after starting Orthos. The radiator is an alphacool Nexxos; 3x 120mm job, and i've got an eihem 1250 moving the water.

Is it likely to be the radiator thats limiting me? flow rates? poor chip contact?
Are these temps around about right for this sort of chip at this speed?
 
Sounds about right. A 20ish degree Delta for that chip with than much voltage is not entirely unreasonable. Find a review that has calculated the C/W rating of your block, then calculate the wattage of your chip at that speed and that voltage. Then do the math; your load temps cannot be less than the C/W of the block no matter how good the radiator is.
 
Netvyper said:
; but under load, it jumps immediately to around 45-50'c... Im talking in less than 5 seconds after starting Orthos.
Click to expand...

That is the key statement there.......

It cannot have anything to do with radiator. Temps after a long period of time of full load are mostly radiator.

The quick jump is to do with thermal resistance from die into the water. This includes heatspreader thermal interfaces and, as Mike says, the block itself. You may reduce this jump by lapping, different TIM's, re-mounting, but possibly not much.

The jump seems about right. Reasuuringly though it will drop down again (almost as quickly as it goes up) when the load is removed.
 
My 6300 in sig jumps from 27-30C to 50-60C within seconds of starting Orthos. Drops back within seconds of stopping Orthos.
 
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