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Overclocking my i5 2500k - I'm overheating! Please advise

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December 2, 2013 4:11:29 PM

So, after just a one day interval I'm back with a fresh issue. (Although my previous was GPU related and solved).

I have: i5 2500k, MSI 7990, 8GBram, Asus Z77-A

I'm trying to overclock my 2500k to 4.5ghz, which I have achieved, but my temps get super hot on all cores if I put it through a stress test, as in high-90's. Which isn't good!

My MB is Asus Z77-a, and my CPU cooler is Arctic Freezer 13 - which I was assured by vendor would be more than capable. I've been following a guide on YouTube (http://www.youtube.com/watch?v=WMZoWOpry40) based on P8P67 bios, which is nearly the same as what i'm using, just a couple of tiny differences.

From reading around I hear voltage could be a problem, or even just re-attached my cooler (which I will try tomorrow, but I felt it was on the only way it could be).

How do I adjust my voltage, and adjust to what (can it be done in OS?)?
Any other ideas?

Thanks in advance, i'm new to the overclocking game. Enjoying the challange, but need the help!
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December 2, 2013 4:23:22 PM

To adjust your voltages you need to do it in the bios. Download CPU-Z and check what your current voltage is set at
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December 2, 2013 4:37:15 PM

lucasz said:
To adjust your voltages you need to do it in the bios. Download CPU-Z and check what your current voltage is set at


Thanks for getting back.

Already had CPU-Z... Core voltage is 1.360.
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December 2, 2013 4:56:26 PM

Also my PSU is Corsair 850w
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a c 106 K Overclocking
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December 2, 2013 5:09:43 PM

Lower your voltage to 1.3v. Most 2500Ks will do 4.5Ghz on 1.3v or even slightly lower. Still it sounds to me like your cooler might be mounted incorrectly or the thermal paste was applied incorrectly. Your voltage is not high enough for those temps with a correctly mounted cooler I don't believe.
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December 2, 2013 5:19:49 PM

anort3 said:
Lower your voltage to 1.3v. Most 2500Ks will do 4.5Ghz on 1.3v or even slightly lower. Still it sounds to me like your cooler might be mounted incorrectly or the thermal paste was applied incorrectly. Your voltage is not high enough for those temps with a correctly mounted cooler I don't believe.


I will check the mount tomorrow. Can I ask how the paste should be correctly applied? There was no instruction and the paste was already on the connecting metal square - I even got a square shaped smudge on my bed as didn't expect the paste to already be applied. I advise for re-approaching this? Should I buy more/clean/start over?

Many thanks. I'll also try the lower voltage tomorrow.
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a c 106 K Overclocking
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a c 100 å Intel
December 2, 2013 6:16:19 PM

Clean off every bit of old paste. I use a coffee filter and rubbing alcohol. The coffee filter leaves no lint. Get new paste if you don't have any, anytime you remove a cooler you need to reapply paste. I use the pea method. Apply a small pea sized amount of paste to the center of the CPU and let pressure from the cooler smooth it out. There are some good guides if you just google it.

As long as you get name brand paste you should be fine. Arctic Cooling MX 4, Arctic Silver 5, etc. there are quite a few good ones.
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December 3, 2013 12:13:29 PM

I hadn't attached properly! I'm stable at 4.5. Now trying to squeeze more :) 
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a c 106 K Overclocking
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December 3, 2013 12:46:08 PM

Don't go over 1.4v or the low 70sC when running Prime 95 or IBT and you will be fine long term.
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