What am I doing wrong overclocking 4790k

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baggsy

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May 15, 2013
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Hello.
So I managed to get 4.8ghz @1.229v and ran aida64 for an hour and 20 runs of ibt but when going for a few hours of occt I was getting bsod.
I decided to drop to 4.7ghz but now it seems I need to run at at least 1.27v to keep it stable at 4.7!
Scratching my head. Now stress testing with occt at 4.7 @ 1.275v.

So far so good but it seems crazy to me that I can get 4.8 to boot and play games for hours with such different vcore.

Thanks in advance guys n girls
 
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Ellis_D

Ellis_D

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Jul 20, 2014
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It seems that with Haswell chips, depending on the quality of the silicone, large boosts in voltage are required the closer you get to 5ghz. Typically, it usually takes adding 20-50milivolts to every multiplier but when you get to around 4.6ghz-4.7ghz, there is a tipping point where you have to start adding 100milivolts+ just to achieve the next multiplier. I experience this personally with my i7 4790k as well. I can do 4.7ghz with a voltage of 1.268 but to get to 4.8ghz, I need a voltage above 1.35.

In order to get to a stable 4.8, You'll more than likely need to increase your voltage as well as have a heavy-duty cooling setup.

http://www.anandtech.com/show/8227/devils-canyon-review-intel-core-i7-4790k-and-i5-4690k/2
From these results, we can see that large voltage jump from 4.6 GHz to 4.7 GHz, which is similar to what launch Haswell CPUs seem to require. This causes an upswing in both temperatures and power draw, meaning that the user really needs that thermal headroom or a nice CPU to move closer to 5.0 GHz. For 4.7
Click to expand...
 
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