i7 4790K WITH CM 212 Hyper EVO, Idle CPU Temps of 38-43 C?

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Sicmaggot999

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Aug 24, 2015
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Hello everyone!

First time posting anything on these threads, but I'm very concerned/worried with what's going on here, this being my first build ever.
While idle, I am getting around 39 - 43 degree Celsius with my i7 4790K at stock clocks and even with a CM 212 Hyper EVO. I've read around but not many have the same scenario by the looks and sounds of it. My build consists of Corsair Graphite 760T Full Tower Case with 2 intake fans in the front, 2 exhaust on top, and one exhaust on the back (not including the CM 212 CPU Cooler). MSI GTX 970, standard clocking, haven't considered overclocking anytime soon. Motherboard is ASUS Maximus VI Extreme Z87. My room stays nice and cool and I keep my build out of tight spaces with plenty of breathing space.
Any suggestions, comments or anything at all really is much obliged and I really appreciate it! Let me know if you have any more questions.
 
Solution
corndog1836
Well your temps are good. I get 32 to 36 degrees at idle with my noctua dh 15 cooler,haf x case, and all fans as intake (6 fans ..3x 220mm, 1 x 240mm, and 2x 140mm in push pull) only one exhaust in back 1x 140mm. I slso have 2x EVGA CLASSIFIED 780ti's in sli blowing hot air inside the case. I wouldnt sweat your temps. You are only a couple degrees off. I have an extreme positive pressure setup...i was trying to see if that type of setup would help you as well. My results speak for themselves
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corndog1836

corndog1836

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turn top exhaust fans into intake for positive pressure setup........

you could also turn top rear fan to exhaust and top front to intake therefore having 3 fans intake and 2 fans exhaust

all fans intake except the rear exhaust....
 
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JackNaylorPE

JackNaylorPE

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As it is setup, you have 2 in ad 3 out which is pretty unbalanced considering that the intake filters on the intake fans reduce flow by as much as a third. It's oft noted that you want a slight positive pressure as this keeps dust from being sucked in to the case. I'm not an adherent of this philosophy as it removes one of the biggest cooling features of the case.... that big holey rear grille.

From a cooling / air movement standpoint, if the only air in and out was passing thru fans, in and out doesn't matter. But if you had 5 fans blowing 50cfm into the case, all 250 cfm gets out, none gets lost and they don't need help from exhaust fans. So whether a fan blows in or out depends mostly on where it is.

You have:

Front: (x2) 120/140mm
Top: (x3) 120mm or (x2) 140mm
Rear: (x1) 120/140mm
Bottom: (x1) 120mm

Which is a bit awkward in that with "normal placement", (front sides and bottom in / top and rear out) you'd have 3 in and 4 out. 4 in and 3 out would be better but I'd be more likely to go 5 / 2 or 6/1 if all mount locations were filled With 5 fans.... I'd do:

Rear = Exahust
Front = (2) Intake
Bottom = Intake
Top = (1) Intake at front of case

However,...since the bottom only mounts a 120mm... you're SOL, in which case I'd do all intakes but rear and use that big holey rear grille to let air out.
 
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Sicmaggot999

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I don't think that's the problem though... I've been told and suggested to make my set up this way from multiple people who've made plenty of builds. Some people are saying my Temps are normal, but I just don't understand why other people with the same cpu and cooler are getting lower temps in idle...
 
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corndog1836

corndog1836

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Mar 31, 2010
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Well your temps are good. I get 32 to 36 degrees at idle with my noctua dh 15 cooler,haf x case, and all fans as intake (6 fans ..3x 220mm, 1 x 240mm, and 2x 140mm in push pull) only one exhaust in back 1x 140mm. I slso have 2x EVGA CLASSIFIED 780ti's in sli blowing hot air inside the case. I wouldnt sweat your temps. You are only a couple degrees off. I have an extreme positive pressure setup...i was trying to see if that type of setup would help you as well. My results speak for themselves
 
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Solution
JackNaylorPE

JackNaylorPE

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Hot air does rise, ..... in the absence of any mechanical force making it otherwise. Warmer air is ever so slightly less dense than cooler air. A 5C increase in air temp makes about a 1.25% decrease in the weight of air, this force is miniscule compared to the mechanical force applied applied by rotating fan blades. If you want to test this turn on a ceiling fan blowing down, release a balloon with warmer air than room temperature and wait for it to hit the fan blades. It will never happen. The very presence of a ceiling fan industry tells us that it will never happen.

My test rig included 6 thermal sensors (0.1C accuracy)... two infrared thermometers are also used along with a fog machine
http://www.amazon.com/Chauvet-Hurricane-901-Fog-Machine/dp/B008HZEW54/ref=sr_1_4?ie=UTF8&qid=1440959338&sr=8-4

On top of that, all the dust you suck in with those top fans blowing out will lay down on nice heat insulating layer of dust which will increase component temps.

I have 15 fans, a0 rad fans blowing in, 4 case fans blowing out, 1 case fan blowing out.... CPU temp is 72C at 4.6 GHZ and GPU temps are 39 to 44C





 
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