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Cooling issues with 4790k

post #1 of 7
Thread Starter 

I've posted recently in other parts of the forums about my GPU's heat in my case, but have also come up on a different issue as well, although I think it's related.

All of my PC's parts are in my signature. Inside this Node 804, my CPU gets to roughly 65C from a 20 minute Intel XTU CPU burn test, and similar results when testing one of my more demanding games, Dragon Age Inquisition. This isn't that bad, but considering everything is at stock, I think the temperatures could be considerably better.

I took the sides off my case to see if the problem is cooling. Immediately, I saw that the temperatures during another XTU burn test hit a max of 55C.

I've ordered Noctua NF-F12s to replace the stock corsair fans pulling air through the top of my H100i -- this should reduce CPU temps a bit. I'm pretty sure I'm going to also sell my GTX 770 that blows air into the case with a blower-style 970 that blows air out the back, to reduce temps inside.

What else, cooling wise, can I do? I have a stock fan pulling air in through the bottom front of the case, and a stock fan exhausting air out the top rear, like common sense dictates. Would replacing these fans with something from noctua or silverstone help towards my goal of cooling everything (particularly the CPU) better? What other suggestions do you guys have?

My issue is trying to figure out what is the best way to solve this. I understand I may not be able to get such a significant decrease in temperatures with the case closed, but I think I could get 5 or 6 C less with a better cooling solution. This also means I could do a better overclock -- after some initial testing, my 4790k needs roughly 1.29v on manual vcore to be stable at 4.7ghz -- with a closed case, this is around 80c, while with the case open, around 70c.

Thanks in advance for the help.

I've also attached a picture showing the cooling setup in my case.
post #2 of 7
Looking at you pic it appears you only have 1 intake fans and 3 exhaust. This means only one 120mm fan vent supplying iar to entire system .. and that is not going to keep things cool. You need to have at least the same amount of area intake as exhaust.

If you have a case with 8x 120mm intakes and 1x 120mm exhaust .. it will only flow as much air as the 120mm exhaust .. no more.

If yo have a case with 1x 120mm intake and 8x 120mm exhausts .. it will only flow as much air as the 120mm intake .. no more.

What coming in must go out .. or .. what coming out must must first come in. Which ever is smaller is the maximum amount of airflow the case will have.
post #3 of 7
Thread Starter 
I have a front, top intake fan on the other side of the chassis (where the HDD cages and PSU are) that brings cool air over my hard drives, but does that not help as much? I can add another 120mm fan to the top front.
post #4 of 7
As things cool down when you open case up we can assume you do not have enough case airflow, so yes, another intake would be a good start.

What is your GPU temp?
post #5 of 7
Thread Starter 
The GPU temp is between 75-80 during intense gaming (Dragon Age Inquisition, Battlefield 4), after a 1-2 hour play session. I've been thinking of replacing it with the ASUS GTX 970 Mini, since it would blow hot air out the back instead of into the case.
post #6 of 7
Thread Starter 
Update: I've bought a noctua NF S12b, per the airflow recommendation from Noctua's site, to aid with intake airflow.
post #7 of 7
Thread Starter 
Another update:

The new Noctua fans came in. I've kept the fractal fan at the front bottom for now (will replace it in a week or two maybe?) and added the Noctua NF-S12b. I've also replaced the corsair fans on the H100i with NF-F12s, and have replaced the back fractal fan with one of the Corsair SP 120s that was on the radiator (since that should be a slight improvement).

Temperatures in the case dropped significantly with the side panel closed. Where I was getting 65 after a 15 min Intel XTU stress test, I was now getting 55-57. I had the corsair fans on a custom RPM curve dependent on CPU temperature, spinning at the most at 1700 RPM. Turning that down to 1300 RPM for the Noctua fans has increased temps to 61 or 62, but regardless this is a significant improvement.

I'm still mulling over replacing the GPU, just because this DCUII gets pretty loud since it's going all the way up to 80C. But overall, I'm happy with the fans.
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