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i7 4790k with Stock Intel Heatsink and Asus Maximus VII Hero Runs 40C Idle, 100+ on Prime95?

Tags:
  • vcore
  • Intel i7
  • 4790k
  • VII
  • CPUs
  • Maximus
  • Asus
  • Hero
  • Heatsinks
Last response: in CPUs
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October 12, 2014 2:12:00 AM

I just installed my Intel i7 4790k CPU in a new Asus Maximus VII Hero motherboard and am running the computer out in the open on top of my desk for now.

For cooling, I am only using the stock heatsink that came in the i7 4790k CPU box. When I installed the heatsink, I didn't put any on any additional thermal paste because it looked like there was already dried thermal stuff on the bottom of the heatsink from the factory when I installed it on top of the CPU.

My question is that according to CoreTemp, all 4 cores are around 40-43C just sitting at idle. When I run the Prime95 program with a "blended" test option, the temps of all 4 cores jump immediately to 100 - 105C. I hit the toggle button on the PSU because I'm scared that there will be permanent damage to the CPU.

Is this normal? I haven't changed any BIOS settings, except to enable Intel virtualization. My plan is to eventually overclock my CPU, but I just wanted to stick with the vanilla non-OC config first.

When I ran CoreTemp, I didn't get a chance to see if the Vcore temp rose because Prime95 made the core temps jump so quickyl that I shut down the computer to avoid getting the CPU permanently damaged by the high temps.

Does anyone have an idea of whether this is "normal", and how I can find out what might be going on?

EDIT: In case it matters, I live in Phoenix and the ambient room temp is around 80F.

More about : 4790k stock intel heatsink asus maximus vii hero runs 40c idle 100 prime95

a b à CPUs
October 12, 2014 2:20:37 AM

Having an open computer is an issue because there is no airflow over the heatsinks. if the paste on the bottom was dry you need to replace it
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a b à CPUs
October 12, 2014 4:37:10 AM

A stock CPU fan isn't meant for running stress tests like that.
Your computer will basically always be about 20+ degrees hotter than your ambient room temps anyways.
@Smackers, he meant the thermal paste that comes preapplied to stock heatsinks, it's unlikely that it was dry, it's just very thick and he probably didn't touch it to see that it was infact sticky.
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a b à CPUs
October 12, 2014 4:44:46 AM

James Mason said:
A stock CPU fan isn't meant for running stress tests like that.
Your computer will basically always be about 20+ degrees hotter than your ambient room temps anyways.
@Smackers, he meant the thermal paste that comes preapplied to stock heatsinks, it's unlikely that it was dry, it's just very thick and he probably didn't touch it to see that it was infact sticky.


I know he means the standard paste, however he specifically mentioned it was dried. But yes, stock heatsinks are not meant for stress tests and especially not in an environment with any airflow. I wouldn't stress the system too much when its not in a case due to airflow restrictions. Its autumn in the US right? Is arizona hot in autumn?
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October 12, 2014 4:45:17 AM

I wouldn't run prime 95 with a stock cooler...

The guy at Asus didn't recommend running that even with a high end cooling solution.

To lower temps you might want to find out the lowest voltage that will provide stable operation and make sure you installed the heat sink correctly.
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October 12, 2014 4:46:14 AM

The Asus guy said that Aid 64 and pass mark are approved for your haswell cpu...
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October 17, 2014 12:23:08 PM

Stick with a closed case. Air pressure is necessary for heat-sinks to operate normally. For better temps, you could run out and grab a cooler master hyper 212 evo. Sometimes they go as low as $25 and are normally $30. It is very reliable. Just be sure your case is large enough to fit it. Other than that unless your doing video encoding (and even then likely wont happen), you won't hit the temps you can reach in prime95, however rocketing temps under stress is a sign your cooler is not functioning properly.
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less than a minute ago

Xibyth said:
Stick with a closed case. Air pressure is necessary for heat-sinks to operate normally. For better temps, you could run out and grab a cooler master hyper 212 evo. Sometimes they go as low as $25 and are normally $30. It is very reliable. Just be sure your case is large enough to fit it. Other than that unless your doing video encoding (and even then likely wont happen), you won't hit the temps you can reach in prime95, however rocketing temps under stress is a sign your cooler is not functioning properly.


Thanks for your reply. I have an old Cooler Master Hyper 212 Plus (not evo) from an AMD Phenom II X6 1050T. The box of the Cooler Master doesn't specifically say that it works with LGA 1150, but I read that it does work with LGA 1150. I'll try that and let you guys know.

Also, if I go into the BIOS and disable the turbo 4.4GHz mode, I don't get the skyrocketing temps so bad when I run Prime95. The clock just stays at 4GHz, and the temps go to ~90C.
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