https://forum.asrock.com/ Copyright (c) 2006-2013 Web Wiz Forums - All Rights Reserved. Sun, 14 Jun 2026 09:46:42 +0000 Fri, 30 Jul 2021 23:54:27 +0000 http://blogs.law.harvard.edu/tech/rss Web Wiz Forums 12.04 360 https://forum.asrock.com/RSS_post_feed.asp?TID=19325 https://forum.asrock.com/forum_images/web_wiz_forums_black.png https://forum.asrock.com/ https://forum.asrock.com/forum_posts.asp?TID=19325&PID=89501&title=asroch-z490-extreme4-rkls-altency-issues#89501 Author: Moppps
Subject: 19325
Posted: 30 Jul 2021 at 11:54pm

Hi all,

I recently upgraded from a i5-10400 to a i9-11900 on my Z940 Extreme 4.
I flashed Bios to last stable release wich was 1.70 everything seemed to be fine.
But when i ran AIDA 64 Cache and Memeory Test i noticed wired wright performance coupled with sub pare latency for choosen Ram settings.

I switched to Beta bios 1.72c but nothing changed.



I checked subtiming an found some wired trained values that killed wright performance (tWRWR_dg was set to 8 wich greatly hinders wright performance )


I mananged to get Read/Wrigth/Copy Bandwith to reasonable numbers ater manually checking subtimings regarding choosen Dram clock and Timings but Latency was still way to worse around 55ns




I double checked back with the old i5 10400 and it got striaght 46ns witch is a reasonable Results for 3466 Cl14



Flipped 11900 back in with comparable Mem settings , still crappy latency around 55ns , like there is no scaling with tighter timings and better clocks on RKL-S latency wise O.o



I took the 11900 to a friend with a Asus z590prime and he got straight 48ns latency with crappy 3200 16-18-18-38 2T 530 with XMP without any other tightning of subtimings .

-All test where done in Gear 1 mode in case of RKL
-All test where done with Energy profile max performance
-Testing with only 2 sticks and another Menemory kit ( 3600 CL16 bined B-Dies ) showed no improvment
-loading optimised defaults and reseting didn´t help either
-reflashing Bios didn`t help

In my opinion we got a problem with Z490 Extreme 4 Bios/microcode + RKL combination that hinders performance and makes upgrades to this kind of CPUs worthless performance wise due to a seroius latency penalty compared to Cometlake ones.

I hope this is something that can be fixed fast with a Bios/Microcodeupdate!







]]> Fri, 30 Jul 2021 23:54:27 +0000 https://forum.asrock.com/forum_posts.asp?TID=19325&PID=89501&title=asroch-z490-extreme4-rkls-altency-issues#89501