Can't overclock someone help!

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Whiteskyhd

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Jan 17, 2017
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Hi, I have an i7 6700k processor, 32gb ddr4 3000mhz ram and an asus z170 pro gaming motherboard.

I've been trying for hours now and I can't overclock it. When I put the system in xmp mode then save and quit it goes to a black screen and windows doesn't boot

New to overclocking probably an easy fix, thanks anyway!
 
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jpatrick2

jpatrick2

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May 4, 2016
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Your motherboard supports 3000mhz, so you should be able to. You should just have to switch to xmp profile 1 in bios.
 
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Whiteskyhd

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Jan 17, 2017
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That's what I thought, but every time I try it, it fails to post
 
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burnhamjs

burnhamjs

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Jan 19, 2017
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Is your CPU overclocked when you are enabling XMP profile 1 ?

I would try enabling XMP in a stock profile to see if it will POST. If it won't it may be advisable to run MEMTEST86 on the memory.
 
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Whiteskyhd

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Jan 17, 2017
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I've also tried it on stock and it still doesn't post, will have to run memtest on it. I read somewhere that my specific cpu may not be able to memory overclock to 3000mhz but instead any able to overclock to 2400 for example
 
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jpatrick2

jpatrick2

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May 4, 2016
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I would be very surprised if your i7 6700k could not support a memory OC to 3000mhz.
 
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burnhamjs

burnhamjs

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Jan 19, 2017
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your mobo shows support for Dual DDR4 3400. I'm guessing you are using slots A2 - B2 for your memory but you could try them in A1-B1 to see if that works.

 
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Whiteskyhd

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Jan 17, 2017
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So would i, but idk why the system won't post in xmp mode
 
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burnhamjs

burnhamjs

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Jan 19, 2017
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Well that's good. XMP usually increases the frequency, adjusts DRAM voltage, as well as some of your timings.

As an example the Corsair Vengeance LPX DDR4 3000MHz runs at 2133MHz, 1.2V, and 15-15-15-36 timing. When you enable XMP it will go to 3000MHz, 1.35V, with 15-17-17-35 timing.
 
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Whiteskyhd

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Jan 17, 2017
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I left the timings as they were, what difference do they make?

 
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burnhamjs

burnhamjs

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Jan 19, 2017
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I'm not sure how this board is about posting links to other sites - but if you google "understanding ram timings" the first link site should be a Hardware Secrets site that has a good explanation.

Take for example the first number which is the CL (CAS Latency). It tells how many clock cycles the memory will delay to return requested data. A memory with CL = 15 will delay fifteen clock cycles to deliver data, while a memory with CL = 12 will delay twelve clock cycles to perform the same operation. Thus, for two memory modules running at the same clock rate, the one with the lowest CL will be faster. Note that when you OC the memory you may or may not be able to keep the timing as tight. The Corsair Tested overclock with frequency, voltage, and timings are coded in the memory and applied when the XMP profile is enabled. You should be able to see these values on the Corsair website if you look at the tech spec tab under your memory.


 
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