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Old 01-29-2020, 11:34 AM
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Originally Posted by Caleb_Dume View Post
The temperature gauge in iCUE says 27C when idle. Assume this is pump liquid temperature?
That is correct and the 60-70C difference between coolant and CPU temp suggests one of two things. You either have a physical contact problem between the CPU and cold plate or you need to set the BIOS properly to handle synthetic stress tests. Someone running 5GHz on all cores on a 9900K would typically have a differential of 40-50C -- not 60-70C and that is where the extra 20C come from.

The contact problem will present itself all the time. Idle temps will be 40-50C. Core temps will jump into the 60-70C range for trivial tasks like opening folders or launching browsers. Coolant temp never budges because heat is not being transferred across to the cooling system. When this is really bad, your stress test fails almost instantly. If you are just a little off, the initial temp is too high and very close to thermal shutdown.

The BIOS issue is far more common on the last several generations of Intel boards. They are designed to boot up and run fast with even the worst CPU of all time and the magic ingredient in that is voltage. It is usually not possible to test most recent motherboards with Prime 95 in pure default trim. It just keeps pouring on voltage. That is the missing data point in your information. Not just what you've set, but the actual level when under 100% load. Those are two different things.

Also, since Prime 95 is not really helping at the moment, get off it and use a milder version for testing. Try the CPU-Z stress test under the bench tab. It is linear. It should start off at XX CPU temp and basically stay there, only rising for each +1C of coolant temp increase. That should make it easy to monitor both voltage and coolant temp to see what's going on.
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