Graphics Card Causes CPU To Overheat

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Ryan_167

Commendable
Jul 26, 2016
3
0
1,510
I recently got a new Z97 Extreme6 Motherboard and a G1 Gaming GTX 970. I transferred over my i7-4790 and the stock cooler for it. I also transferred over all of my other components that are working perfectly.

I noticed that playing any kind of game triggers a shut down because of temp protection in the BIOS. Upon further investigation, I noticed that the GTX 970 seems to cause this. When I run Prime95 with the GTX 970 installed, the temperature reaches 100C in less than 30 seconds, even with the case off and the GPU temperatures not even reaching 30C. As soon as I take the GTX 970 out, I can run the Prime95 for an hour without ever breaking 40C.

I am 100% positive this isn't an airflow issue. Could it possible be an issue with the PSU? I have a Rosewill RG630-S12 660W PSU. I am guessing that somehow the CPU is getting too much voltage but I'm not sure if I should fix this via the BIOS, buy a new PSU, or some other way.

Build:
900D case
Z97 Extreme6 Motherboard
i7-4790
16GB 1600 RAM
6x 5TB HDD
240GB SSD
2x PCIe Sata Cards
G1 Gaming GTX 970
 
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Ryan_167

Commendable
Jul 26, 2016
3
0
1,510
The actual temps are kind of irrelevant it is the difference in temps are what concerns me:
-With graphics card installed -> MSI Afterburner shows 100C constantly when running prime95
-With graphics card removed -> MSI Afterburner shows ~40C constantly when running prime95

Just in case that isn't enough though, I used Intel's Processor Diagnostic Tool:
-With graphics card installed -> Failed the CPU load test (passed the rest). It passed a couple load tests but the temps climbed fast until it hit 101 degrees below the max and failed.
-With graphics card removed -> Passed all tests. Most of the CPU Load tests were 50+ degrees below the max.

I know it is not a thermal paste issue since I reapplied new thermal paste. I know it isn't a case airflow issue either since I opened the case and shot a giant fan in there and the CPU still overheated with the GPU installed. It has to be some kind of voltage issue that causes the CPU to run way too hot. I just have no idea what it is or how to troubleshoot it further.
 
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Ryan_167

Commendable
Jul 26, 2016
3
0
1,510
Even though I just updated the BIOS, resetting to the default values seemed to do the trick. Thanks! Just for future reference, I am still seeing ~40C running the Prime95 on my 4790 with the stock cooler. Confirmed with MSI Afterburner and HWMonitor. Not sure how 100C could ever be normal since that triggers a protective shutdown, at least with the the BIOS I'm running.
 
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