https://forum.asrock.com/ Copyright (c) 2006-2013 Web Wiz Forums - All Rights Reserved. Sat, 04 Apr 2026 17:16:07 +0000 Wed, 23 Sep 2020 14:10:51 +0000 http://blogs.law.harvard.edu/tech/rss Web Wiz Forums 12.04 360 https://forum.asrock.com/RSS_post_feed.asp?TID=15719 https://forum.asrock.com/forum_images/web_wiz_forums_black.png https://forum.asrock.com/ https://forum.asrock.com/forum_posts.asp?TID=15719&PID=79781&title=about-a520mitx-ac-fclk-issue#79781 Author: ASRock_TSD
Subject: 15719
Posted: 23 Sep 2020 at 2:10pm

Dear xplangchao,

Greetings, this is ASRock TSD.


With the latest BIOS version, we have modified the DRAM auto rule.


When Memory Frequency >= DDR4-3600 Mhz, Fabric will be set as default 1800 and there will have below two scenarios:

(configuration 1) Memory Frequency and Fabric mclk is 1 : 1/2 , so NB frequency = 1/2 Memory Frequency.
Ex DDR4-3600 Mhz, Fabric =1800Mhz , NB = 900Mhz

(configuration 2) Memory Frequency and Fabric mclk is not 1 : 1/2 , so NB frequency = 1/4 Memory Frequency.
Ex DDR4-4000 Mhz, Fabric =1800Mhz , NB = 1000Mhz


Thanks!

All the best,
ASRock TSD
]]> Wed, 23 Sep 2020 14:10:51 +0000 https://forum.asrock.com/forum_posts.asp?TID=15719&PID=79781&title=about-a520mitx-ac-fclk-issue#79781 https://forum.asrock.com/forum_posts.asp?TID=15719&PID=79762&title=about-a520mitx-ac-fclk-issue#79762 Author: xplangchao
Subject: 15719
Posted: 22 Sep 2020 at 8:16pm

ThreeDee wrote: what do you have the infinity fabric set to in the BIOS?

It's set to auto, and the memory is DDR4-4000(xmp). In CPU-Z memory tab, the north bridge frequency is 1000.
I found a new BIOS version was released:
https://www.asrock.com/mb/AMD/A520M-ITXac/index.asp#BIOS
The BIOS description says this version fixes fabric and NB frequency auto rule, however when I updated the BIOS to V1.2 and load UEFI setup to default, CPU-Z still shows the north frequency is 1000.
Seems the fix does not function.]]> Tue, 22 Sep 2020 20:16:14 +0000 https://forum.asrock.com/forum_posts.asp?TID=15719&PID=79762&title=about-a520mitx-ac-fclk-issue#79762 https://forum.asrock.com/forum_posts.asp?TID=15719&PID=79131&title=about-a520mitx-ac-fclk-issue#79131 Author: ThreeDee
Subject: 15719
Posted: 08 Sep 2020 at 8:08pm

what do you have the infinity fabric set to in the BIOS?]]> Tue, 08 Sep 2020 20:08:32 +0000 https://forum.asrock.com/forum_posts.asp?TID=15719&PID=79131&title=about-a520mitx-ac-fclk-issue#79131 https://forum.asrock.com/forum_posts.asp?TID=15719&PID=79111&title=about-a520mitx-ac-fclk-issue#79111 Author: xplangchao
Subject: 15719
Posted: 08 Sep 2020 at 12:07pm

]]> Tue, 08 Sep 2020 12:07:07 +0000 https://forum.asrock.com/forum_posts.asp?TID=15719&PID=79111&title=about-a520mitx-ac-fclk-issue#79111 https://forum.asrock.com/forum_posts.asp?TID=15719&PID=78877&title=about-a520mitx-ac-fclk-issue#78877 Author: xplangchao
Subject: 15719
Posted: 03 Sep 2020 at 4:31pm

Still waiting for help, thank you guys.]]> Thu, 03 Sep 2020 16:31:22 +0000 https://forum.asrock.com/forum_posts.asp?TID=15719&PID=78877&title=about-a520mitx-ac-fclk-issue#78877 https://forum.asrock.com/forum_posts.asp?TID=15719&PID=78771&title=about-a520mitx-ac-fclk-issue#78771 Author: xplangchao
Subject: 15719
Posted: 01 Sep 2020 at 7:23pm

Sorry for the typo, the CPU is R5 4650g (Renoir APU).]]> Tue, 01 Sep 2020 19:23:50 +0000 https://forum.asrock.com/forum_posts.asp?TID=15719&PID=78771&title=about-a520mitx-ac-fclk-issue#78771 https://forum.asrock.com/forum_posts.asp?TID=15719&PID=78770&title=about-a520mitx-ac-fclk-issue#78770 Author: xplangchao
Subject: 15719
Posted: 01 Sep 2020 at 7:22pm

Hi, here's my PC:
Mobo: Asrock A520m-itx ac
CPU: AMD R5 4640g (APU)
Mem: Team DDR4-4000 (XMP)
I upgraded the Mobo BIOS from the stock version to V1.1, here's the link:
http://www.asrock.com/mb/AMD/A520M-ITXac/index.asp#BIOS
I checked the CPU-Z RAM tab and found the North Bridge frequency is set to 1000Mhz automatically. I believe that 2000Mhz is the right velue, which is equal to the RAM frequecy. So I went to BIOS setup and tried to set the infinity fabric frequency to 2000 manually (it's auto by default) and saved seetings then quit, but CPU-Z told me that the NB frequency was still 1000Mhz.
So I went to BIOS setup again and loaded default UEFI settings and restored my RAM frequency to 2400Mhz (XMP disabled), and then checked CPU-Z again, now the NB frequency became 600Mhz.
My question is, my iGPU performance is significantly degraded by 10% after the BIOS V1.1 upgrade, and I imagine it's related to the abnormal NB frequency (or the FCLK frequency). How can I set it to be the same as the RAM frequency? Or else does the V1.1 BIOS has some kind of bug that will cut half the FCLK? If so, when can you fix this issue?
Thank you very much!

]]> Tue, 01 Sep 2020 19:22:42 +0000 https://forum.asrock.com/forum_posts.asp?TID=15719&PID=78770&title=about-a520mitx-ac-fclk-issue#78770