https://forum.asrock.com/ Copyright (c) 2006-2013 Web Wiz Forums - All Rights Reserved. Sun, 05 Apr 2026 11:23:49 +0000 Thu, 09 Jul 2020 21:42:07 +0000 http://blogs.law.harvard.edu/tech/rss Web Wiz Forums 12.04 360 https://forum.asrock.com/RSS_post_feed.asp?TID=14857 https://forum.asrock.com/forum_images/web_wiz_forums_black.png https://forum.asrock.com/ https://forum.asrock.com/forum_posts.asp?TID=14857&PID=77125&title=z390-pro4-xmp-bug#77125 Author: argyx
Subject: 14857
Posted: 09 Jul 2020 at 9:42pm

Thanks, but no the higher voltages are the issue. It might not damage the RAM, but it doesn't run Windows 10 that way.

The default voltages are too high and unstable in usage. Using the voltages from the Z370 XMP Bug post of VCCIO(1.1v) and VCCSA(1.150v) resulted in system stability.

Apparently devs have the default profile voltages even lower in the test BIOS support had me test. VCCIO(0.950v) and VCCSA(1.050v), Auto from the fixed profile implementation.

https://imgur.com/a/a0MtzZL]]> Thu, 09 Jul 2020 21:42:07 +0000 https://forum.asrock.com/forum_posts.asp?TID=14857&PID=77125&title=z390-pro4-xmp-bug#77125 https://forum.asrock.com/forum_posts.asp?TID=14857&PID=77093&title=z390-pro4-xmp-bug#77093 Author: ASRock_TSD
Subject: 14857
Posted: 08 Jul 2020 at 3:07pm

Dear Argyx,

Thanks for posting your query to the ASRock forum.

Regarding your question, the VCCIO, and VCCSA can be adjusted to a higher voltage without concern.

The memory modules that you are using might not require such voltage, lowering the voltage should help the RAM to be more stable while operating.

Again, there should be no concerns on the voltage of VCCIO(1.2v) and VCCSA(1.25v).

With thanks,
ASRock TSD

Edited by ASRock_TSD - 08 Jul 2020 at 3:12pm]]> Wed, 08 Jul 2020 15:07:50 +0000 https://forum.asrock.com/forum_posts.asp?TID=14857&PID=77093&title=z390-pro4-xmp-bug#77093 https://forum.asrock.com/forum_posts.asp?TID=14857&PID=77046&title=z390-pro4-xmp-bug#77046 Author: argyx
Subject: 14857
Posted: 07 Jul 2020 at 6:57am

...and to clarify, the system runs Windows 10 solid at those settings. I gamed the remainder of the weekend with those voltage settings @ 3200MHz. Worked a full day today, including rendering eLearning video. No issues.

Benchmarks are even better now, and inline with expectations for CPU (i7-9700KF) and RAM.]]> Tue, 07 Jul 2020 06:57:08 +0000 https://forum.asrock.com/forum_posts.asp?TID=14857&PID=77046&title=z390-pro4-xmp-bug#77046 https://forum.asrock.com/forum_posts.asp?TID=14857&PID=76991&title=z390-pro4-xmp-bug#76991 Author: argyx
Subject: 14857
Posted: 05 Jul 2020 at 12:32am

It would appear, that just like posted in 'Z370 Extreme4 XMP bug', the voltages for some DDR4 RAM are set too high when using XMP.

My board is the Z390 Pro4 running BIOS 4.50. RAM is Corsair LPX CMK32GX4M2B3200C16 (listed in QLV for the Z390 Pro4). System was unstable in Windows 10 Pro 64bit.

Following Flode's advice on the Z370 board, I've changed vccio from 1.2v to 1.1V and vccsa from 1.25v to 1.15

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