Prime95 Temps Too High for i7-4790k?

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kefloxin

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Feb 27, 2009
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Hello all,

I built a new PC with the new processor that just came out and I ran prime95 to verify CPU stability and tempuratures, and my temperatures were around 95C the entire time... I ran the blend test, about 5 tests then decided to stop. Room temp is about 25C.

I am using the stock cooler for now but I haven't overclocked so does that seem a little high or is this normal? Would re-applying the thermal paste help?

Thanks!
 
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hapkiman
Yes you can get by with the stock Intel for a short while as long as you do not overclock or run any stress or stability test. I would never run such an expensive and high end proc like the i7 4790k on the stock Intel cooler unless I wasn't doing anything more taxing than general use (which would be silly with a 4790k). That stock cooler is adequate, and thats all. Well actually its barely adequate.

I understand money issues, but you really need a good after market cooler on such a fine processor. It is after all still a Haswell, and is going to run warm when you push it. That cheapo Intel stock cooler can't handle any real cooling duties- just basic cooling with no stress.

Try for a closed loop liquid cooler (don't know what...
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kefloxin

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Ok, thanks for the answer. I was actually over-budget on so I decided to get the cooler later as I don't really plan to overclock until later on down the line.

Do you think I can get by with this cooler without any issues for at least a few months?
 
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hapkiman

hapkiman

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Yes you can get by with the stock Intel for a short while as long as you do not overclock or run any stress or stability test. I would never run such an expensive and high end proc like the i7 4790k on the stock Intel cooler unless I wasn't doing anything more taxing than general use (which would be silly with a 4790k). That stock cooler is adequate, and thats all. Well actually its barely adequate.

I understand money issues, but you really need a good after market cooler on such a fine processor. It is after all still a Haswell, and is going to run warm when you push it. That cheapo Intel stock cooler can't handle any real cooling duties- just basic cooling with no stress.

Try for a closed loop liquid cooler (don't know what case you have), Corsair H80i, H100, NXZT etc.... if possible, but yes the Hyper 212 EVO will also be fine for the less expensive choice.

By the way, I quit running Prime95 or Intel Burn test on my i7 4790k. I know my proc is stable and rock solid at this point, and those benches just put unrealistic loads, and too much stress on the DC proc. Haswell can't take it. I initially ran Prime95 on my 4790k and stayed in the high 60's (C) but then realized I had Hyperthreading off, AVX off, and manually set voltage low, which kept my temps unusually low. I only fooled myself because when I set voltage to auto and turned those two functions on, temps soared toward 90 (C). Try running Aida64 is you need a stability test.

DC procs just can't handle Prime like SB (or even IB) could. They will freaking burn up. Still a great processor though and so fast it just plain crazy. I think its safe to say at this point its just not the OC king that Intel led us to believe it would be. I'm very happy with mine though, and I keep it running at 4.4Ghz 24/7 with my MSI mobo's "Enhanced Turbo" function. No temp problems at all there, and I idle in the mid 20's (C). Under load (gaming, etc, NOT PRIME), it runs in the mid 40s (C). Aida64 stability test runs in the mid 60s (C).

The 4790k is a fantastic proc, get a good cooler man. Please.

Good:
http://www.newegg.com/Product/Product.aspx?Item=N82E16835103099

Better:
http://www.newegg.com/Product/Product.aspx?Item=N82E16835181031&cm_re=h80i_corsair-_-35-181-031-_-Product

Best:
http://www.newegg.com/Product/Product.aspx?Item=N82E16835181032&cm_re=h100i-_-35-181-032-_-Product

Best #2:
http://www.newegg.com/Product/Product.aspx?Item=N82E16835146042
 
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Vitric9

Vitric9

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I would not use P95 too much for a Haswell CPU. Aida64 is designed for newer instruction sets on Ivy Bridge and newer so the temps may b a bit lower by a few degrees. Also the i7 4790k is clocked 4.4Ghz on turbo out of the box. It is going to get regardless, especially on an Intel Stock Cooler. No two PCs are the same so do not fret if you temps are a few degrees higher then a benchmark or review. Plus Different motherboard are going to give more or less current to the CPU.
 
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NGMK

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My 4790k used to runs from 29-33C at idle with the stok cooling and 70-91C on Prime95. Now with the H100i (corsair) it is running at 22-25C at idle and 48-61C after 20 Minutes on Prime95. I'm not overcloacking
 
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CompuTronix

CompuTronix

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Nov 13, 2006
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kefloxin,


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

Core i 2nd, 3rd and 4th Generation CPU's have AVX (Advanced Vector Extension) instruction sets. Recent versions of Prime95 run AVX code on the Floating Point Unit (FPU) math coprocessor, which produces unrealistically high temperatures. The FPU test in the software utility AIDA64 shows the same results.

Prime95 v26.6 produces temperatures on 3rd and 4th 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 35% larger Die.

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

Please run only Small FFT’s for 10 minutes.

Your Core temperatures will test 10 to 20C lower.

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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