OC Technical Discussion - X99M Extreme 4

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X99M Extreme 4 - Xeon > 103mhz BCLK OC

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Category: Overclocking(OC) Zone
Forum Name: OC Technical Discussion
Forum Description: OC enthusiast's tech talk
URL: https://forum.asrock.com/forum_posts.asp?TID=4169
Printed Date: 01 Dec 2025 at 4:12am
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Topic: X99M Extreme 4 - Xeon > 103mhz BCLK OC

Posted By: mer
Subject: X99M Extreme 4 - Xeon > 103mhz BCLK OC
Date Posted: 05 Jan 2017 at 12:48am

" rel="nofollow - Hi

is there anything I can do to try to get more than 103mhz stable BCLK OC on a xeon v4 on the x99m ex4 ?

Many thanks,
Konstantinos

Replies:

Posted By: Xaltar
Date Posted: 05 Jan 2017 at 12:55am

Not really sadly. Haswell-EP and Broadwell-EP CPUs do not have unlinked BCLK like Skylake or Kaby Lake so the instability comes from other components being effected by the raised BCLK such as PCIe.

The only things you can try are voltage tweaks for your VCCIO VCCSA, PCIe, system agent etc. If there is a voltage setting google it to see what it is for and if upping it can increase stability. I doubt it will make any difference but if you are determined to try then be sure to double check everything via research before proceeding. Adjusting the wrong voltage or adjusting too high can fry your system. Personally I wouldn't recommend it.

Let us know how it goes if you do try though Thumbs Up

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Posted By: mer
Date Posted: 05 Jan 2017 at 1:01am

" rel="nofollow - What would be the primary components to fail at more than 103mhz ? I know this is a vague question. I only run a PCIE AMD radeon on the system and an m2 . I could give the system a try with higher voltage agents. I dont mind playing with the voltages a bit :)

Posted By: Xaltar
Date Posted: 05 Jan 2017 at 1:37am

PCIe, RAM and PCH (chipset) mostly.

I tried to find a decent diagram that lays out what effect BCLK has on Haswell and Broadwell-EP but I can't seem to find the one I referenced a few years back anymore.

Again, voltage adjustment is a long shot Wink

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