B850M pro RS wifi RAM issue
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=113375
Printed Date: 08 Nov 2025 at 5:46pm
Software Version: Web Wiz Forums 12.04 - http://www.webwizforums.com
Topic: B850M pro RS wifi RAM issue
Posted By: Lux-V
Subject: B850M pro RS wifi RAM issue
Date Posted: 08 Nov 2025 at 6:23am
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good evening. i've having an issue with my asrock B850m pro rs wifi from the very beginning. i i haven't been able to make it boot dual module RAM and it only work with one in the A2 socket, when i add the 2nd RAM in B2 it wont boot at all and the RAM led stay yellow/red have tried everything from setting the RAM to 5200mhz, flashing BIOS to 3.50. i already tested both RAM and they both work fine just not together. my spec are: CPU: R5 9600x RAM: predator vesta 2 6400mhz kit MOBO: asrock B850M pro RS wifi GPU: asus AMD radeon 7600XT 16gb |
Replies:
Posted By: Xaltar
Date Posted: 08 Nov 2025 at 7:50am
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Have you tried the RAM in slots A1 and A2 together? If both work in this configuration then there is a high chance you have a defective CPU. Sadly this is a fairly common issue these days with CPU memory controllers (IMCs) being marginal or just bad out the box. Often times there may be some RAM that will work fine but others will exhibit this issue. It is an indicator of a marginal/bad RAM channel on the IMC. The reason the RAM slots are labeled A1/2 and B1/2 is to indicate the channels, A channel and B channel. Each are connected to their own independent portion of the IMC which gives you "dual channel", allowing the CPU to access each RAM module individually simultaneously thus doubling RAM bandwidth. If the both modules do NOT work in slots A1 and A2 then you may have incompatible or marginal/bad RAM. Sadly I doubt this is the case if both work fine in slot A2 individually. ------------- 
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