i7 4790k AIDA64 CPU+FPU test showing 95-100 degrees?!

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SideFlame

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I have a Dark Rock 3 (non-pro) CPU cooler which is actually a good cooler and I was expecting to do some overclocking. However, before even overclocking, I done a stress test with AIDA64 with Stress FPU ticked and it starting throttling straight away up to 100 degrees!

Without Stress FPU it's showing around 72-80 degrees. I'm imagining this isn't normal. Please someone help me out.. I thought my cooler was good! And my case has good cooling.

It doesn't even feel hot when I put my hand near the exhaust fan? Am I getting incorrect temps? CPUID is showing the same temps too.

Idle temps are around 40 degrees. I tried replacing my thermal paste today and it didn't change anything.
 
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CompuTronix

CompuTronix

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SideFlame,

This is precisely why I'm not a fan of AIDA64; there are too many confusing test combinations which have no conclusive results.

And yes, it's completely normal to quickly reach throttle temperature when running just the FPU test only!

Although AIDA is useful for stability testing, it's not ideal for thermal testing because of it's fluctuating workloads which produce fluctuating temperatures.

When thermal testing, the goal is to run a utility which will replicate Intel's Thermal Design Power (TDP) as closely as possible, because TDP isn't just a calculated value, it's also a measured value where both must agree.

The only utility which comes closest to replicating Intel's test parameters is Prime95 Version 26.6 Small FFT's, because it's a steady-state 100% workload within 3% TDP that produces steady-state core temperatures.

Do NOT run any versions of Prime95 later than 26.6. Here's why:

Core i 2nd through 6th Generation CPU's have AVX (Advanced Vector Extension) instruction sets. Recent versions of Prime95, such as 28.9, run AVX code on the Floating Point Unit (FPU) math coprocessor, which produces unrealistically high temperatures. The FPU test in the utility AIDA64 shows similar results.

Prime95 v26.6 produces temperatures on 3rd through 6th Generation processors more consistent with 2nd Generation, which also have AVX instructions, but do not suffer from thermal extremes due to having a soldered Integrated Heat Spreader and a significantly larger Die.

Please download Prime95 version 26.6 - http://windows-downloads-center.blogspot.com/2011/04/prime95-266.html

Run only Small FFT’s for 10 minutes.

Use Core Temp to measure your temperatures - http://www.alcpu.com/CoreTemp

Your Core temperatures will test 10 to 20C lower with v26.6 than with v28.9.

Please read this Tom’s Sticky: Intel Temperature Guide - http://www.tomshardware.com/forum/id-1800828/intel-temperature-guide.html

CT :sol:
 
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SideFlame

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Aug 22, 2015
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Idle temps are 40 degrees though, that's not normal, right?
 
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SideFlame

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Ambient Temps are around 22 degrees. The power saving features are off. I used just over a quarter of the whole thermal paste syringe. I'm thinking maybe I put too much because it definitely wasn't pea sized. I don't know if it'd make that much difference though. Any other suggestions?
 
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Decends

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Out of curiosity, what motherboard are you using? I know some motherboards can cause the I7 4790k to turbo all 4 cores to 4.4 which could explain the higher than average temps. My own MSI Z97 Gaming 5 does that to my I7 4790k. But yes those temps seem higher than normal. Even at 4.4 GHz across all 4 cores, my I7 4790k reaches 90C under stress test with Be Quiet! Shadow Rock Slim at 23C Ambient.
 
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CompuTronix

CompuTronix

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SideFlame,

Too much thermal compound can act as a thermal insulator rather than as a thermal conductor.



Decends,

That's still a little vague ... just so we can compare apples to apples, you might be a more specific and tell us to which stress test you're referring? It makes a difference.

Thanks,

CT :sol:
 
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Decends

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The one Asus stress test that Pushes CPU GPU and Ram to max. *Edit>* Asus ROG Realbench
 
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Decends

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Yep, That's why i chose it. Since it also test multiple instruction sets including the one Prime95 28.9 uses as well i believe.

That's why i think his temps are to high for a Be Quiet Dark Rock 3, given that his i7 is stock speeds i think, but mine is turbo'd to 4.4@1.212v with the weaker Be Quiet Shadow Rock Slim.
 
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So I have just reapplied the thermal paste for a second time, this time only putting a tiny little pea dot in the middle. Much less than I put last time. I'm running the same AIDA64 stress test and guess what.... I'm hitting 70 DEGREES. That's a 30 degrees difference just from reapplying thermal paste.... AND THAT'S THE TEMPS WHILE OVERCLOCKED TO 4.4GHZ!!

Anyone who comes across this post in the future panicking about high CPU temps, reapply your thermal paste and just put a tiny dot in the middle. Here's an image for reference, this is roughly how much I put http://www.hardwaresecrets.com/wp-content/uploads/htatc011.jpg

You may not think thermal paste matters, but it does. Putting too much thermal paste can increase the distance between your CPU cooler and the CPU and the thermal paste will act as an insulator.. Causing even more heat.

Also, the thermal paste doesn't need to spread over the whole CPU, don't worry about that. Tiny dot in the middle, then put your cooler on. Don't try any fancy methods, just keep it simple.
 
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