Z390 Pro4 XMP Bug
Printed From: ASRock.com
Category: Technical Support
Forum Name: Intel Motherboards
Forum Description: Question about ASRock Intel Motherboards
URL: https://forum.asrock.com/forum_posts.asp?TID=14857
Printed Date: 03 Aug 2025 at 2:11am
Software Version: Web Wiz Forums 12.04 - http://www.webwizforums.com
Topic: Z390 Pro4 XMP Bug
Posted By: argyx
Subject: Z390 Pro4 XMP Bug
Date 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 
|
Replies:
Posted By: argyx
Date 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. |
Posted By: ASRock_TSD
Date 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 |
Posted By: argyx
Date 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 |