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Stable OC'ed pc, sometimes won't boot

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Category: OverClocking(OC) Zone
Forum Name: OC Technical Discussion
Forum Description: OC enthusiast's tech talk
Printed Date: 06 Feb 2023 at 1:53pm
Software Version: Web Wiz Forums 12.04 -

Topic: Stable OC'ed pc, sometimes won't boot
Posted By: xxxmoscoxxx
Subject: Stable OC'ed pc, sometimes won't boot
Date Posted: 06 Jun 2016 at 5:10pm
Hi all, i have a Z170 extreme 4 on bios 2.80 and an i5 6400. I can OC the cpu easily, and i can reach 4500+ mhz without problem, but i prefer mild overclock: i want to keep my cpu  @4ghz with ram@3200mhz (higher blck are unstable with these ram frequencies). 
Ok well, my pc is stable: cpu@4ghz 1.01v, ram 3200mhz; PERFECT. Prime 95 test passed, gaming sessions ok, it works flawlessy.

My problem is.... sometimes, completely random, my pc won't boot. It does not show either UEFI.. i need to unplug the power and try to reboot... but WHY? Can you help me?

Posted By: jcsbanks
Date Posted: 07 Jun 2016 at 5:31pm
I had similar sounding problem with the same board, 6700K at 4.6GHz and Corsair Vengeance 3000MHz at XMP profile, even at standard CPU speeds with two sticks of RAM, OK with one (either one so not faulty RAM). I increased the IO and SA voltages by 0.05V respectively and now all is stable so far.

Posted By: xxxmoscoxxx
Date Posted: 07 Jun 2016 at 9:11pm
Thanks for the answer, could you be more specific? I only have increased vcore to 1.150, bclk to 150, ram @3200 xmp profile (corsair vengeance lpx 2x8GB). I haven't understand  which voltages  have you increased? 

Posted By: Xaltar
Date Posted: 07 Jun 2016 at 9:21pm
VCCIO and VCCSA is what he is talking about. Increasing them can improve stability and prevent boot issues with certain RAM modules, as jcsbanks suggested, start with a 0.05v increase on both and avoid going over 1.25v on either or you may run into thermal issues. 

The settings are both in the UEFI on the same page as your CPU voltage control if memory serves. If your RAM does not receive enough voltage at power on it can cause the symptoms you described.  


Posted By: xxxmoscoxxx
Date Posted: 08 Jun 2016 at 3:13am
Thank you very much, i will try next days!

Posted By: parsec
Date Posted: 12 Jun 2016 at 2:03pm
The VCCSA and VCCIO voltages shown in the OP's screenshots are rather high now. If this board is like mine, the actual values will be even higher.

I would be careful increasing the VCCSA and VCCIO voltages beyond what they are at now. In some cases, decreasing these voltages somewhat results in more stability than increasing them.

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Posted By: clubfoot
Date Posted: 21 Sep 2016 at 11:01am
1.01v seems very low. Does it complete 3x passes of Realbench 2.43? If it blue screens what is the error message?

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