i7 4790k Overheating (Spikes and High Idle Temp)

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elmorocks333

Feb 25, 2018
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I have an i7 4790k that is usually idling anywhere from 45 to 75 degrees under almost no stress at all.
Using a LEPA AquaChanger 240 cooler that I've had for a couple years with absolutely no problems, and I'm fairly certain that the pump is still working as I can still hear it working/feel water moving through the hoses. I just re applied thermal paste and dusted out my entire computer in hopes that I could fix my problem but nothing changed. The piece that sits on top of the CPU and the very beginning of the hoses stemming from that get very hot. I could have nothing running and not even touch my computer and temps will still jump all over the place, sometimes as high as 95 degrees under no load whatsoever. I'm completely lost on this, the only option I can still think of and find online is to buy another cooler and HOPE that solves my issue. Help!
 
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CompuTronix
elmorocks333,

On behalf of Tom's Moderator Team, welcome aboard!

If you can "hear" the pump running and "feel" water moving has little relevance. There is no direct drive shaft connection between the motor and the pump impeller, which eliminates seals and a potential shaft leak. The impeller is instead magnetically coupled to the motor, each of which runs in a separate chamber, just like a swimming pool pump. This means the motor can still run, even if the impeller is stalled due to the buildup of sediments either in the pump head, tubes or radiator.

Also, the fact that the water block / pump assembly and hoses feel hot to the touch tells you that there's little or no water circulation. Considering that you've had the unit for...
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CompuTronix

CompuTronix

Intel Master
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Nov 13, 2006
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elmorocks333,

On behalf of Tom's Moderator Team, welcome aboard!

If you can "hear" the pump running and "feel" water moving has little relevance. There is no direct drive shaft connection between the motor and the pump impeller, which eliminates seals and a potential shaft leak. The impeller is instead magnetically coupled to the motor, each of which runs in a separate chamber, just like a swimming pool pump. This means the motor can still run, even if the impeller is stalled due to the buildup of sediments either in the pump head, tubes or radiator.

Also, the fact that the water block / pump assembly and hoses feel hot to the touch tells you that there's little or no water circulation. Considering that you've had the unit for "a couple years", all liquid coolers will eventually fail. It’s not a question of if; it’s a question of when. Pumps have moving parts that wear out, so those which run 24/7 are more prone to premature failure. AIO units are notorious for failures due to inferior pump quality, whereas custom loops, which can be cleaned, typically use high-end pumps that have greater longevity.

Concerning spiking, Core temperatures increase and decrease instantly with changes in load. Intel’s specification for Digital Thermal Sensor (DTS) response time is 256 milliseconds, or about 1/4th of a second. Since Windows has dozens of Processes and Services running in the background, it’s normal to see rapid and random Core temperature “spikes” or fluctuations, especially during the first few minutes after startup, which should eventually decrease. Any software activity will show some percentage of CPU Utilization in Task Manager.

Unfortunately, you need to replace your unit, or if it's still under warranty, send it in for RMA. Additionally. it's always a good idea to keep at least a stock cooler close at hand for the inevitable AIO failure, so your rig won't be down.

Once again, welcome aboard!

CT :sol:
 
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