Asrock AB350m Pro4 - any ram over 8gb unusable!
Printed From: ASRock.com
Category: Technical Support
Forum Name: AMD Motherboards
Forum Description: Question about ASRock AMD motherboards
URL: https://forum.asrock.com/forum_posts.asp?TID=13807
Printed Date: 08 Aug 2025 at 2:38pm
Software Version: Web Wiz Forums 12.04 - http://www.webwizforums.com
Topic: Asrock AB350m Pro4 - any ram over 8gb unusable!
Posted By: crayzcrinx
Subject: Asrock AB350m Pro4 - any ram over 8gb unusable!
Date Posted: 08 Mar 2020 at 11:36pm
Hi there, I have exhausted many options and have a post on reddit (https://www.reddit.com/r/techsupport/comments/feus23/how_do_i_find_out_what_hardware_is_reserving_half/) for this issue, but also need to ask on the asrock site as im more and more convinced it's a motherboard problem:
If there is more than 8gb of memory installed it is "hardware reserved".
It is NOT a GPU issue (I have amd Vega 64, but swapped for a 750ti and the issue was still there).
It is NOT an issue with any of the individual memory sticks (Each works fine on their own and have all been through memory tests).
The current memory installed is CMK16GX4M4A2666C16 which is 4x4GB sticks which is on the memory QVL list.
Many people have said it is likely a memory mapping issue or some memory settings in the bios need adjusting, but how do i find the problem? What settings of the 1000s in the bios should I adjust to fix this?
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AMD Ryzen 1700
CMK16GX4M4A2666C16
ASRock AB350 Pro4
Win 10 64 bit
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Replies:
Posted By: ThreeDee
Date Posted: 09 Mar 2020 at 3:22am
which BIOS are you running? Have you tried updating the BIOS? Have you tried just clearing the CMOS?
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|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|
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Posted By: crayzcrinx
Date Posted: 09 Mar 2020 at 7:33am
I cleared the CMOS on the bios to see if that helped (which had been version P5.40) It's now on the board default. I can't reflash the bios as it always tells me it cant find the image on the root drive of the USB.
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AMD Ryzen 1700
CMK16GX4M4A2666C16
ASRock AB350 Pro4
Win 10 64 bit
|
Posted By: ThreeDee
Date Posted: 09 Mar 2020 at 8:09am
which version are you trying to update to? Website says update to 5.50 before going any newer. Make sure you just have the straight AB35PR45.50 ROM file and that it's not still zipped up. What format is your USB drive formatted in? Fat32? NTFS? (either one should work)
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|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|
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Posted By: crayzcrinx
Date Posted: 09 Mar 2020 at 3:20pm
I'm not too bothered about updating the bios. But yes, it's fat32 formatted and there is only the rom on the drive. The main problem is it hardware reserving all the memory above 8gb for no reason.
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AMD Ryzen 1700
CMK16GX4M4A2666C16
ASRock AB350 Pro4
Win 10 64 bit
|
Posted By: ThreeDee
Date Posted: 09 Mar 2020 at 11:25pm
well .... a bios update might cure your woes as you are running a pretty old version and are obviously having some issues
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|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|
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