Z390 Pro4 XMP Bug

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   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

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argyx Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 05 Jul 2020 Status: Offline Points: 5	Post Options Post Reply Quote argyx Report Post Thanks(0) Quote Reply Topic: Z390 Pro4 XMP Bug 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

ASRock_TSD Members Profile Send Private Message Find Members Posts Add to Buddy List ASRock_Official Joined: 20 Mar 2015 Status: Offline Points: 8907	Post Options Post Reply Quote ASRock_TSD Report Post Thanks(0) Quote Reply 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

argyx Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 05 Jul 2020 Status: Offline Points: 5	Post Options Post Reply Quote argyx Report Post Thanks(0) Quote Reply 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.

argyx Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 05 Jul 2020 Status: Offline Points: 5	Post Options Post Reply Quote argyx Report Post Thanks(0) Quote Reply 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