ASRock.com Homepage
Forum Home Forum Home > Technical Support > AMD Motherboards
  New Posts New Posts RSS Feed - About A520m-itx ac FCLK issue
  FAQ FAQ  Forum Search Search  Events   Register Register  Login Login

About A520m-itx ac FCLK issue

 Post Reply Post Reply
Author
Message
xplangchao View Drop Down
Newbie
Newbie


Joined: 01 Sep 2020
Status: Offline
Points: 7
Post Options Post Options   Thanks (0) Thanks(0)   Quote xplangchao Quote  Post ReplyReply Direct Link To This Post Topic: About A520m-itx ac FCLK issue
    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!

Back to Top
xplangchao View Drop Down
Newbie
Newbie


Joined: 01 Sep 2020
Status: Offline
Points: 7
Post Options Post Options   Thanks (0) Thanks(0)   Quote xplangchao Quote  Post ReplyReply Direct Link To This Post Posted: 01 Sep 2020 at 7:23pm
Sorry for the typo, the CPU is R5 4650g (Renoir APU).
Back to Top
xplangchao View Drop Down
Newbie
Newbie


Joined: 01 Sep 2020
Status: Offline
Points: 7
Post Options Post Options   Thanks (0) Thanks(0)   Quote xplangchao Quote  Post ReplyReply Direct Link To This Post Posted: 03 Sep 2020 at 4:31pm
Still waiting for help, thank you guys.
Back to Top
xplangchao View Drop Down
Newbie
Newbie


Joined: 01 Sep 2020
Status: Offline
Points: 7
Post Options Post Options   Thanks (0) Thanks(0)   Quote xplangchao Quote  Post ReplyReply Direct Link To This Post Posted: 08 Sep 2020 at 12:07pm
Back to Top
ThreeDee View Drop Down
Senior Member
Senior Member
Avatar

Joined: 24 Jul 2019
Location: Billings,MT
Status: Offline
Points: 2396
Post Options Post Options   Thanks (0) Thanks(0)   Quote ThreeDee Quote  Post ReplyReply Direct Link To This Post Posted: 08 Sep 2020 at 8:08pm
what do you have the infinity fabric set to in the BIOS?
|Ryzen 5 5900|ASRock X570 Taichi-BIOS 4.60|2x16GB HyperX Predator RGB 3200@3600 1:1 IF|ASRock RX 6700XT|2 x PCIe 4.0 M.2 Drives for OS & Games|850 WTT Seasonic 80+ Titanium PSU|Noctua NH-D15|
Back to Top
xplangchao View Drop Down
Newbie
Newbie


Joined: 01 Sep 2020
Status: Offline
Points: 7
Post Options Post Options   Thanks (0) Thanks(0)   Quote xplangchao Quote  Post ReplyReply Direct Link To This Post Posted: 22 Sep 2020 at 8:16pm
Originally posted by ThreeDee 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.
Back to Top
ASRock_TSD View Drop Down
ASRock_Official
ASRock_Official


Joined: 20 Mar 2015
Status: Offline
Points: 8517
Post Options Post Options   Thanks (0) Thanks(0)   Quote ASRock_TSD Quote  Post ReplyReply Direct Link To This Post 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
Back to Top
 Post Reply Post Reply
  Share Topic   

Forum Jump Forum Permissions View Drop Down

Forum Software by Web Wiz Forums® version 12.04
Copyright ©2001-2021 Web Wiz Ltd.

This page was generated in 0.141 seconds.