4790K getting 100 C at stock speed, after applying second time thermal paste arctic 5

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ivobaren

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Aug 17, 2014
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dear experts,

My system is :

i7 4790k at stock speed - no oc
scythe mugen 4 cooler (1 fan not 2 like the pc games edition) on silent mode in bios
asus z97 maximus ranger mobo
8 gb corsair vengeance pro 2400 mhz xmp enabled (2x4 gb)
sapphire r9 290 tri-x vga
corsair 230t case with 3 stock case fans on silent mode in bios
seasonic m12II evo 620 watt power supply

When running prime95 in the first 3 minutes the temperatures using HW monitor are about 60-65C.
After that, temperatures go up quickly from 74 to 90 C until they reach 100 C. Running CPU-Z
at the same time it shows that idling the cpu is using about 0.7 volts and during prime95 is running at
1.271 volts. I applied the thermal paste using the pea size method in the middle and then attaching the heatsink right away. Next to that, the ram is high profile and the heatsink + fan take up 2 memory slots that's why I mounted the fan lying on top of the memory leaving the lowest part of the heat sink with less air flow so i can have dual channel enabled. Ambient temperature is about 20 - 23 C.

Could you please advise why are the temperatures so high and what can i do to solve this problem?
Thanks.


 
Solution
anbello262
With a 212 at 1.23V the latest version of prime95 quickly takes my chip to 100°C.
It's not about the stock speeds, but about the voltage. Try to disable Auto voltage and choose your voltage manually (lowest stable voltage).
That way you will have a lot better temps.
Your chip should run at stock speeds with less than 1.15-1.20V.
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viewtyjoe

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Jul 28, 2014
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If you have reapplied thermal paste, I would look at issues with the physical heatsink. Are all heat pipes closed, good contact, installed correctly, etc. After that, it's time to contact the vendor or manufacturer for a new one if you can't find anything wrong.
 
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Muchobanana

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Dec 27, 2013
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Well the first thing I would try is getting a program to crank up your cpu fan speed to 100%, run the test again and see what you max temp is. If you still get 100 degrees then you either mounted your cpu cooler wrong or the cpu cooler is not performing correctly for some reason and i would get another.
 
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Trenchcoat

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May 7, 2013
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The temparatures are so high because, if I understand right, you have removed all active cooling from your heatsink making it a passive heatsink, and with the case fans turned down, there is insufficient airflow to effectively cool your cpu.

It may be possible to flip the cooler 180 degrees and have the fan in the correct location on the heatsink.
 
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ivobaren

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Aug 17, 2014
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this may be true (the casefans making my heatsink passive? if i understood right?) well the options in bios for fan control for the case fans and for the cpu fan are: silent, standard, turbo so which one should i pick for the cpu fan and which one for the case fans?
 
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CompuTronix

CompuTronix

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anbello262

anbello262

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Sep 27, 2013
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With a 212 at 1.23V the latest version of prime95 quickly takes my chip to 100°C.
It's not about the stock speeds, but about the voltage. Try to disable Auto voltage and choose your voltage manually (lowest stable voltage).
That way you will have a lot better temps.
Your chip should run at stock speeds with less than 1.15-1.20V.
 
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Solution
I

ivobaren

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Aug 17, 2014
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this also makes sense to me and i tried yesterday to see how to reduce the voltage in bios but did not manage to. The bios is so complicated it looks like this (these pics are from kitguru so these are not my values and voltages)
oc-5.jpg
and
oc-4.jpg
wish i knew what values i have to input and where
 
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ivobaren

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Aug 17, 2014
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Dear experts, anbello262 = guru and CompuTronix = guru, yes it was the voltage and the version of prime95 - i was indeed using the latest one. What i did was i set the Cpu Core Voltage to 1.17 Volt (at 1.15 volt prime95 would produce a blue screen and reboot) and run prime95 v26.6 for 30 mins. The highest temp i clocked was 75C. Nevertheless, the downside of setting the core voltage manually for my mobo is that when the cpu is idling, that is, underclocking itself to save power, it is still drawing 1.17 volts as opposed to previously when the setting was Cpu Core Voltage to Auto it was using lower voltage that is 0.7 volts.
 
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ivobaren

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Aug 17, 2014
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Thanks for the tip but i can't figure out how to go about it: adaptive setting is clear but the offset with maximum voltage 1.17 and minimum 0.7 is confusing as there are so many offset options with different functions and also what values should be keyed in
 
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