Normal watercooling gave me 40 degrees C CPU temp ( idle 4.2GHZ ) at 24 degrees ambient. All temps measured via "Core Temp" 0.99.3
HC1000 cools it down to whatever I set on the Chillers display regardless of overclock ( currently 4.4GHz ) and that's with both video cards at the same temp ( again at idle ).
If I set the chiller to 17 degrees, my CPU temp at idle is 17 degrees !..........Prime 95 ( In place large FFT's ) take CPU temps up to 48 - 50 at 4.4 GHz
The HC1000 holds those water temps no problems at all at full load.
I've had my run at extreme temps ( sub zero )....too much hassle. I use my machine for business and it has to be 100% reliable 100% of the time.
Although, a QX9650 at 4.4GHz should gain entry into the lower end of "Xtreme"
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