Random Temperature Spikes i7 6700K

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FarsideSC

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Dec 24, 2016
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http://imgur.com/AHK4NsU

Please take a look at the screenshot. You can see that I'm getting random temperature spikes with my processor. I've been reading about this issue with the processor and some motherboards, but people usually chalk that up to one of two things: Poor cooling and poor voltage.

In my case, I've already re-applied thermal paste twice to make sure it wasn't a poor cooling job. Watching HWInfo I'm able to see that the voltage is spiking from .8 at rest to 1.36 randomly. My processor is at a stock clock. However, I do have an XMP enabled on my memory. Would this be the root cause to my random temperature spikes? I'm not sure if it is, because when I "upgrade my processor to i7 6700k @ 4.6GHz" with the motherboard BIOS settings, I get the same thing. What can I do to level out the temperature spikes while keeping my memory OC'd? (The memory is rated for 3000MHz, but the motherboard defaults it to 2133).
 
Solution
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XMP does in fact overclock the memory controller, which the power management system will pull more power dynamically to support faster memory speeds.
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Xibyth

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Mar 22, 2014
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What your seeing is the active power management. It's entirely normal to see the voltage spike whenever you start running applications such as Chrome, as the CPU goes from .86GHz to 4GHz the voltage increases as well. Applications that run in the background, even Windows Update and malware scanner can cause the CPU to turbo.
 
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FarsideSC

Commendable
Dec 24, 2016
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1,510
I was previously using an i7 3770K with a small overclock. I didn't see the spikes in temps like I am with this processor. It just doesn't seem right that at 4.0GHz the voltage would want to spike to 1.36V.

I played around a little bit and put my memory at 2133MHz and set the voltage to 1.2V with XTU. The max voltage under a stress test was 51C. That's much better than the 90C I was getting.

I guess I'm just going to have to play with all of this :)
 
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FarsideSC

Commendable
Dec 24, 2016
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1,510


I was playing around with my BIOS a bit more to see if there were any clues. Sure enough, XMP was causing the spikes. I set my clock to 4.6GHz and I'm seeing very stable temperatures. Right now my memory is clocked at 2133 @ 1.2V, which it is rated for 2666 @ 1.2V, so I'll play with that later. I'm just happy that I got the constant spiking to stop. Temperatures in game were 50GPU/50CPU, now we are sitting at 40/35. What a difference.
 
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Xibyth

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Mar 22, 2014
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I usually stick to 1866 with ddr3 memory. It offers a good balance of power usage, latency, and speed without putting too much stress on the CPU's memory controller, which gives better overclocks. The only time it becomes advantageous to get super high memory speeds is with an APU, as faster memory does increase framerates and performance of onboard graphics.
 
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