3770k high temps @3.9, undervolted

s-eng

Honorable
Aug 8, 2013
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10,510
Hello, everyone! I'm hoping someone might have some tips for me.

I have a fairly modest system:

CPU: Intel 3770k (mild overclock to 3.9, offset is -0.160, voltage at load is ~1.08)
Mobo: Maximus V Formula
RAM: 4 x 4GB Corsair Vengenace 1866
GPU: EVGA GTX 570 SC
HDD: 1TB WD Black, 1TB Seagate Barracuda
SSD: Samsung 840 Pro
Case: Corsair 650D
Case Cooling: 2 x Coolermaster Megaflow 200 (front intake, top intake), 1 x Noctua NH-PF12 (rear exhaust)
CPU Cooling: Noctua NH-D14 (NF-A15 PWM, NF-F12 PWM)

At idle, with ambient temps ~25C, i get a range of 37-39 on core 1 and core 4, with core 2 and 3 in the high 20's low 30's.

When I do a blend of Prime95, i hit a maximum of ~70C on all four cores.

I can confirm the heatsink is mounted correctly, oriented correctly, with the fans blowing the "expected" direction (out the back). I am fairly confident at this point the thermal compound has been applied correctly (please see next point)

I have attempted to: Reapply TIM, reseat heatsink (I learned much during this process, and with the Noctua NT-H1 compound, a little really goes a long way!)

I did the reapplication about 6 times in the last two days... with high temps in the high 70's (used WAY too much TIM), I've kind of refined my method and I think it's being done right.

I have also attempted running a P95 load test with the side panel off... this doesn't help much at all, 1 or 2C at most, if anything)(

Questions for the experts:

1. I've heard the Corsair 650D is not an ideal air cooling case. As you can see, I've attempted to rectify this with better/quieter fans. Having said that, is another case warranted (thinking Carbide 540)... or would it be a waste (please see #2)

2. Since i tested with the panel off, and i saw almost no improvement, can I infer a new case won't help much (if at all)?

3. I upgraded the fans recently on the NH-D14 (the old fans were really dirty, replaced them while being cleaned). So it's been another bit of an investment in the NH-D14... would it be worth it to consider another cooler?

I thank you all for your time, and hope someone can point me in the right direction.
 
Solution
change your case fans so front and side are inlets and back and top are outlets, the top being an inlet will be blowing hot air down into the case.

70 on prime is not bad to be honest, what sort of temps do you see while gaming etc?

s-eng

Honorable
Aug 8, 2013
7
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10,510


Thanks for answering, mauller.

On the "bad" attempts (CPU under p95 load is in high 70's) I'm pretty sure I used way too much.

I didn't try the spread method (heard it's no good), but the size of my rice grain got smaller and smaller until:

On the final (i hope successful) attempt, i followed Noctua's directions (finally) and did a small dot in the center of the CPU"s heatspreader.

 
change your case fans so front and side are inlets and back and top are outlets, the top being an inlet will be blowing hot air down into the case.

70 on prime is not bad to be honest, what sort of temps do you see while gaming etc?
 
Solution

chugot9218

Honorable
Why is your top fan an intake? Heat rises, that's the prime spot for an exhaust. Sounds to me like the large amount of air being pushed into the case by 2 200mm fans cannot be properly exhausted by a single rear 120mm, if that is indeed your setup. I have the 650D and have no cooling problems, I have a 200mm front intake, a 140mm front intake, 200mm top exhaust, 140mm rear exhaust, and 140mm 2 side intakes.

*edit* Mauller beat me to it but that sounds like the problem to me, the top should not be intake for sure. *edit*
 

s-eng

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Aug 8, 2013
7
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10,510


Thanks, fellas. I'll try this.
 

funguseater

Distinguished
HI

The D14 is mighty good. Has the CPU always run hot? If so you may have one that has an incorrectly applied line of TIM inside the CPU. I have seen this a few times now where when I delid the processor (done about a dozen so, the TIM is a big issue, where is QC?) the TIM is either not making full contact to the IHS or there is VERY little TIM even in there. You might want to consider either delidding it your-self or finding a local computer shop that will assist you. I only suggest the Vise method and remember to put down a cloth.

The Fan being an intake on the top really has no bearing unless your CPU fans are being directed up, as you saw when you removed the side. CPU goes back and out. The air 1 foot above the desk isn't really any warmer... ;)

Anyway just my thoughts. Good luck with your issue.
Fungi
 

chugot9218

Honorable
It's not that the air above the desk is warmer, it's that any air that may be trying to rise up is being blown right back down all willy nilly all over the case, even perhaps back into the CPU fan. And it's trying to exhaust all that air out 1 120mm fan. I was going to re-post though that your temps aren't horrible, on a .4 ghz OC on my i5-3570k I get around 70-80 on prime.
 

s-eng

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Aug 8, 2013
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10,510


Thanks for answering, Fungi. I actually tried this when I got the CPU last year. I tried 5 times, but stopped myself each time because I thought I was close to damaging the CPU. It is something I still consider, but I don't think I have the steady hands or precision required to do this.
 

s-eng

Honorable
Aug 8, 2013
7
0
10,510


Sorry for the late reply, i wanted to test during the night to be sure.

It helped at load by about 1 or 2C. Your solution makes sense about hot air rising, and it has the bonus i don't have to use a dust cover for the top fan anymore.

I brought up the same question over on Anandtech's forums, and the consensus seemed to be although my temps weren't great, they were well within safe limits. I've decided to stop worrying about the temperatures since they're OK, and focus on getting my fans running at a perfect speed of decent cooling/low-no noise.

Thanks again, Mauller. If i continue with this case I'll stick with your suggestion for the top fan being an exhaust.