Intel Motherboards - X99 Extreme4: MTRR errors after S4 sleep

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X99 Extreme4: MTRR errors after S4 sleep

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=3180
Printed Date: 10 Sep 2025 at 5:38pm
Software Version: Web Wiz Forums 12.04 - http://www.webwizforums.com

Topic: X99 Extreme4: MTRR errors after S4 sleep

Posted By: Gary74763
Subject: X99 Extreme4: MTRR errors after S4 sleep
Date Posted: 04 Aug 2016 at 12:45am

I just assembled a new PC. It seems to be working well, except that whenever it wakes from sleep (S4), the Windows Event Viewer shows an Event 137 error, "The system firmware has changed the processor's memory type range registers (MTRRs) across a sleep state transition (S4). This can result in reduced resume performance".

I have a clean install of Windows 10 Pro x64, latest updates installed, latest drivers installed from ASRock. BIOS settings are all UEFI defaults, which includes memory XMP profile at 2400--no manual tweaking. (I also tried the memory JEDEC profile at 2133, no difference. I tried disabling the fast-boot option in the memory settings; also no difference.) There are no tuning apps installed.

I've run memtest86 for hours with no errors found.

Any suggestions would be appreciated.

ASRock X99 Extreme4 (BIOS 3.40)

i7-6800K

Crucial Ballistix Sport DDR4-2400 4x8GB BLS4CBG4D240FSB

Crucial BX200 SSD 480GB (firmware MU02)

Replies:

Posted By: ASRock_TSD
Date Posted: 11 Aug 2016 at 7:29pm

Dear customer,

Greetings, this is ASRock Technical Support Department.

Regarding your case, please use Instant Flash function to flash the BIOS to L3.51 as the link:

https://mega.nz/#!0hsGxSrK!IyhXwDfpGQX89LkBfmk0z63dFnjfHQm_k9mlbaVBvsc

Instant Flash: http://www.asrock.com.tw/support/BIOSUI.asp?cat=BIOS8

Thank you for your patience.

If any, please feel free to contact us!

Kindest Regards,

ASRock TSD

Posted By: Gary74763
Date Posted: 12 Aug 2016 at 2:36am

Yes, that fixed the problem. Thank you very much!