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i7-4770k CPU idle temperature above 80 degrees?

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September 10, 2013 8:49:19 AM

I built my computer yesterday, and turned it on today. In the BIOS I saw CPU temperature ~ 87 +/- degrees with CPU FAN RPM ~ 610 +/- (fan RPM rated at 600 - 2000 RPM). This cannot be right.
I applied the thermal paste correctly, about half a pea size, spread it uniformly and thinly on the CPU back (didn't see any exposed metal), peeled off the plastic from CM 212 heat sink surface, and then installed the heat sink.
How much should I trust this reading? Should I uninstall the heat-sink, clean, and re-apply the thermal paste? Any ideas?
Are there internal sensors on my Asus Z87 Gryphon mobo that read the CPU temperature?

Specs
CPU = i7-4770k
CPU Cooler = CM Hyper 212 EVO
MOBO = Asus Z87 Gryphon
CASE = Fractal Design Define Mini
PSU = Seasonic 550W Gold Certified Semi-modular
RAM = 16 GB (2x8 GB) Crucial Ballistix VLP 1600 MHz
SSD = Samsung 840 Pro 256GB
OD = LG 24X DVD/RW
a b à CPUs
September 10, 2013 8:54:47 AM

Thats not good. Use Core Temp to check. I am guessing the heatsink is not tight enough. You should be seeing more like 30C at idle. If temps are still too high in Core Temp, reseat the heatsink.
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a b à CPUs
September 10, 2013 8:56:25 AM

i would say check the heatsink again and reseat it. sometimes there may be incorrect readings but i would check the bios to see what your voltage and everything is set for. did you update your bios as well ? sometimes they have bugs. if nothing seems to help rma that thing
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September 10, 2013 9:00:26 AM

maestro0428 said:
Thats not good. Use Core Temp to check. I am guessing the heatsink is not tight enough. You should be seeing more like 30C at idle. If temps are still too high in Core Temp, reseat the heatsink.


The 4 screws on the crisscross latch that comes with 212 evo are screwed tightly. In fact the screw design along with the springs around them are made such that you can tighten them up to a certain point, but no more. They run out of thread.
There is a nut around the central screw on the crisscross latch that holds the heat sink down. This nut can be tightened further, but there is also a spring around the screw holding the nut. This is the only thing I can further tighten.
First of all is the reading accurate? I didn't install any sensors to read the CPU temp. The mobo must have this incorporated in the LGA socket.
Secondly, if I were to do it again, should I apply more thermal paste?

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September 10, 2013 9:02:42 AM

06yfz450ridr said:
i would say check the heatsink again and reseat it. sometimes there may be incorrect readings but i would check the bios to see what your voltage and everything is set for. did you update your bios as well ? sometimes they have bugs. if nothing seems to help rma that thing


The BIOS showed a reading of 1.04V for the CPU. Not sure if this is consistent with the 87 degree temp reading. The BIOS version is 1007 and the update to this is 1206 (which I haven't done). The 1206 only fixes a bug in "WAKE-ON-LAN" feature, and is irrelevant. BIOS should be good.
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a c 75 à CPUs
September 10, 2013 9:05:59 AM

my first question is "does the motherboard temp sensor display in Fahrenheit or Celsius?

next is some info on how to apply thermal paste and the CM 212 evo. First use a small pea size amount of thermal paste. next use the Cooler its self to spread the paste by setting the cooler on the CPU and with a slow circular motion move the cooler around on the CPU. Not to much as you don't want the thermal paste to flow over the edges of the CPU. Then attach the mounting bracket to motherboard.

this method allows for optimal spread of the thermal paste with this cooler.

next is If the motherboard reads in Celsius and is saying 87°C remove the cooler and reapply the paste in the manor I mentioned. Make sure the fan is attached to the front of the cooler blowing through the fins towards the back of the case.
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September 10, 2013 9:22:29 AM

bgunner said:
my first question is "does the motherboard temp sensor display in Fahrenheit or Celsius?

next is some info on how to apply thermal paste and the CM 212 evo. First use a small pea size amount of thermal paste. next use the Cooler its self to spread the paste by setting the cooler on the CPU and with a slow circular motion move the cooler around on the CPU. Not to much as you don't want the thermal paste to flow over the edges of the CPU. Then attach the mounting bracket to motherboard.

this method allows for optimal spread of the thermal paste with this cooler.

next is If the motherboard reads in Celsius and is saying 87°C remove the cooler and reapply the paste in the manor I mentioned. Make sure the fan is attached to the front of the cooler blowing through the fins towards the back of the case.



Thanks bgunner! You'd think someone who has TA'ed before telling students about units wouldn't be so stupid to overlook this. The CPU is at 82 degree Farenheit or 28 degrees Celcius, which seems reasonable.
At any rate, should I uninstall the heat sink anyway, and re-apply the thermal paste, just like you suggested, leave a dollop and press the heat sink against it or just leave it as is?
Also, should I increase the CPU fan RPM or leave it as is?
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a c 75 à CPUs
September 10, 2013 9:32:15 AM

As long as when you stress the CPU your temps stay cool there is no need to reapply the thermal paste. 28°C is an excellent temp so my recommendation is use a stress test program like Prime 95 or Intel burn test to stress the CPU and find out if the temps will be OK.
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September 10, 2013 11:01:24 AM

bgunner said:
As long as when you stress the CPU your temps stay cool there is no need to reapply the thermal paste. 28°C is an excellent temp so my recommendation is use a stress test program like Prime 95 or Intel burn test to stress the CPU and find out if the temps will be OK.


Will do! I'll install the OS tonight, along with the drivers, then do some testing. Can't wait to tinker with this. It is my second build ever, although the first one was a pretty simple build (used the stock fan, i3, computer came with PSU, and used a $70 mobo, no SSD).
I'm excited to OC this baby to 4.2ish, and see how stable the CPU will be.

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