Help!! CPU temp jumping between 70 and 90+

mufc802

mufc802

mufc802

Soldato
Joined
1 Jul 2009
Posts
2,675
Hi

Just got a new CPU & Mobo, i7 4790k and Gigabyte UD3H BK. I am reusing the H50 cooler from my old build. I have re-applied thermal paste onto the cooler (pea size - Arctic MX-4). Now when I launch Intel Burn Test, I get temps at 70, then a jump to 90+, and back down to 70 again. It went as high as 98 and I shut it down.

I am not overclocking, it just turbo's to 4.4GHz.

The case is also new, a Corsair 780t, coming from an Antec 902, all other components are re-used from the old build.

How can I fix this?
 
Reset BIOS back to defaults and update it if necessary.

Re-run, if the temp hasn't changed then either you have fluffed the TIM or the cooler isn't making proper contact with the CPU, remove the H50, clean the CPU and cooler and re-apply.
 
I've not even gone into the bios since I only finished building it late last night, so I am quite unfamiliar with using it. The voltage is 1.272 on HWMonitor, not sure about the bios.
 
Dont run IBT lololol


Avx instructions cause increaced vcore while running IBT thats why your temps are massively spiking.
 
Testing with Prime95 and the temps are staying under 80 which is better. Yes the pump is working, otherwise I think the CPU would just overheat within seconds. It has worked the past 5 years with my old CPU fine.
 
Yeah get the bios updated before ya do anything else, if your gigabyte sofware is anything like mine you will have appcenter logo on your taskbar quicklaunch, just right click that and hit bios then update it.

Try using realbench instead of IBT it wont overheat it so much.
 
BluD said:
Yeah get the bios updated before ya do anything else, if your gigabyte sofware is anything like mine you will have appcenter logo on your taskbar quicklaunch, just right click that and hit bios then update it.

Try using realbench instead of IBT it wont overheat it so much.
Click to expand...

I didn't install any Gigabyte software appcentre, I just installed things like USB3 driver off the CD. Will look for a bios update anyway.

I will try realbench, thanks.
 
if your still on stock bios that will tend to overvolt the cpu,later bios's fixed it,which should give you lower temps
 
The bios was F6, I updated it to F7. I am wondering whether to have a look at reapplying the cooler since some cores differ by 10 degrees in some cases to other cores.
 
could try,but big temp differences isn't uncommon

theres only so much you can do with haswell anyway as it runs hot,and the weathers been hot today

you'd be better off not stress testing and play some games instead,then look to see max core temps
 
Stress test with asus real bench, anything that uses AVX instructions such as IBT, p95 ver 28.5 will send temps sky rocketing on haswell.
 
I found that turning the fan around behind the radiator of the H50 has helped lower the temps quite a bit. Ran 15 minutes of Realbench and the max temp was 81. I also adjusted the voltage core to 1.2v for the 4.4GHz. Does this temp seem reasonable?
 
Reseat cpu/reapply paste

Check cpu fan header in bios

Try powering the pump off a fan to molex adapter, some gigabyte boards don't like AIOs
 
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