i5-3570k running too hot.

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itsthesebbe

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Dec 17, 2012
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I recently bought a GTX 1080 and since I still use my old CPU (i5-3570k), I want to overclock this slightly so the bottleneck will be less present. I am now a little worried about the temperatures. On stock clockspeed, my idle temperatures are around 45-48 and under full load (using Prime95), temperatures reach in the low 80s. The ambient temperature is around 24-25.

I have a Cooler Master Hyper 212X cooler with a Noctua NF-F12 mounted on it. The cooler has no dents or damaged heatsinks, as it is quite new (1 year old). I have added new thermal paste and reseated the heatsink several times, but that did not help either. About my case, I have Zalman Z11 Plus with two exhaust fans (120, 140mm) and an intake fan (140mm). I have turned all fans on full load.

I'm worried that when I'm going to overclock, the temperatures will get higher, which will put CPU at risk. Does anyone know what could be causing these temperatures?
 
Solution
Ecky
As these CPUs age, it's not unheard of for the thermal paste between the CPU die and the bottom of the heatspreader to degrade or dry out. The only fix for this is to remove the heatspreader and replace the paste.

Edit: this is a pretty well documented but still fairly dangerous modification.
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Sedivy

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Dec 17, 2016
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Humm...that is a little high for that cpu, considering it runs pretty cool generally. I'd say case itself is probably the biggest issue combined with a 1080 that generates tons of heat. I'm guessing you're using blower type cooler on it so warm air is going back into the case? Then rising up to increase your cpu temperature. Without strong front to back airflow to mitigate this, it makes for a hot case.
But 80s under load without overclock still seems a little high to me. Have you had these temperatures before you got your 1080? What was the range before?
 
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itsthesebbe

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Dec 17, 2012
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Honestly I think the airflow in the case should be pretty decent. I replaced all the stock case fans with noctua fans (NF-a14 for top and intake and an NF-S12A as an exhaust. All oriented correctly!) When these fans are running at 100%, they move a lot of air and I mean a lot! The problem was there already before I got my gtx 1080, when I was using my old Radeon HD 7870.
I never really worried about my temperatures since I wasn't planning on overclocking anything so I don't know what the temperatures were, say, a year ago unfortunately. All I know that it's been a thing for the last 2 weeks.
Also, to be exact:
This is how much thermal paste I applied the last time I reassembled the heatsink. Maybe there's something wrong with that. https://m.imgur.com/5g1zxez
 
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Sedivy

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Dec 17, 2016
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Yeah I'm not surprised temps went up when you got it. 1080 is a very hot card, and I fear good fans are not going to save what's otherwise mediocre air flow from only a single fan up front. Any chance you could add a fan to the bottom of the case for intake, next to that psu? Seems like there's a possible slot there? Taking out the bottom hdd cage (unless you're using it) might also help obstruct the front fan less and help push some more cold air in.

As for thermal paste, I don't think so. That looks about on a generous side but still quite ok to me.
 
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itsthesebbe

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Dec 17, 2012
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I am using the bottom drive bay for my HDDs and that one is completely riveted in, so I don't think I could get it out of there without sawing it out. Do you really think adding another intake would make a big difference? I have some left over fans that I could use as intake fan, I'll try installing that tomorrow.
 
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Sedivy

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Dec 17, 2016
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I don't think it'll hurt. You can add one (I assumed you had a fan or two kicking around, almost everyone does), and see if the temps improve any. If you find barely any improvement in temps, it's easy enough to take it out. Yes I think it'll help cool your 1080 down a bit, which in turn shouldn't be roasting your cpu quite so much. But the improvement might be marginal. If there is a lot of obstruction, might create turbulence and though very unlikely even increase a temp a degree or two. In any case monitor before and after adding a fan and see for yourself. I could speculate all day long but nothing beats trying it out.
 
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Ecky

Ecky

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Feb 3, 2013
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As these CPUs age, it's not unheard of for the thermal paste between the CPU die and the bottom of the heatspreader to degrade or dry out. The only fix for this is to remove the heatspreader and replace the paste.

Edit: this is a pretty well documented but still fairly dangerous modification.
 
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