4790K at Load is 25C (45F) Higher than 4690K Under Same Conditions. Normal?

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OldOfflineMan

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May 25, 2015
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I recently got a 4790K cheap and wanted to compare against my 4690K in terms of thermal performance. Everything was tested under the exact same conditions (I even turned off Hyperthreading on the I7). Below are the load temperatures running off of my Hyper Evo 212 cooler:

Test 1 - I5-4690K 55C (131F) - Fans not on 100%
Test 2 - I7-4790K 80C (176F) - Fans at 100%
Test 3 - I7-4790K 75C (167F) (reseated the CPU cooler) - Fans at 100%
Test 4 - I5-4690K 55C (131F) - Fans not on 100%

Is the difference in temperatures normal?

Many thanks in advance.
 
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IamTimTech

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Oct 13, 2014
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Why was the processor cheap? Do you know the person you bought it from? If so did it run cool in their computers? Turn your hyperthreading back on and test it again. That is the reason your temps are high.
 
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OldOfflineMan

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My friend upgraded (I7-5XXX) and he sold it to me cheap. He was running it overclocked at 4.8 GHz under watercooling, so our temps can't be compared.

Why would turning off hyperthreading increase the temperatures?
 
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IamTimTech

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Because hyperthreading is the way the i7 is intended to be run. It will be working for efficiently. Just turning of the hyperthreading doesn't equate evenly to an i5. When you turn off hyperthreading you are only running half of 4 cores doing the same work as four full cores. I turn on use of all cores and hyperthreading in my friends laptops. The allows them to run cooler. Most commonly they have 2 cores on and 2 cores off with hyperthreading enabled from the factory just like an i3. That should tell you something. See for yourself
 
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OldOfflineMan

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MarkW

MarkW

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The I7 has a larger cache memory, it runs at a slightly higher clock speed, and normally has hyperthreading. I have no idea why turning Hyperthreading off would cause temperatures to go up, but the chip itself has more active transistors than the I5 does.
 
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IamTimTech

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The reason is that with hyperthreading off it is using less transistors to do the same work causing them to get pretty hot. Spreading that work out over twice the transistors allows each one to run cooler generating less heat. I remember when I discovered this it blew my mind. The first laptop I unlocked went from a leaf blower to whisper quiet while running prime 95 when I enabled hyperthreading and all cores. It didn't make sense to me but it sure did.
 
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IamTimTech

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Almost always this is the case, especially when you use the auto-overclocker.
 
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