AMD B650/X670 Boards Don’t Fully Support 24GB and 48GB DDR5 Memory DIMMs (For Now)

At the time of launch, AMD’s AM5 platform suffered from certain memory compatibility issues. While most of them have been ironed out, few remain. MEDGAsizeGPU (Twitter) was able to find one regarding high-memory modules. Turns out that the AM5 platform is still not fully compatible with 24GB and 48GB memory DIMMs. Using one results in the infamous “Boot Media Not Found” error.

Strix B650-E and 7600X can fully recognize the 24G*2 ram in the bios.
But it can’t boot normally to the OS with these new 24G modules.
Still need AMD and mobo brands to release new bios to fix it.

Originally tweeted by MEGAsizeGPU (@Zed__Wang) on March 7, 2023.

Zed_Wang tested the Ryzen 5 7600X on the ASUS ROG Strix B650E-Gaming WiFi with a Corsair Vengeance 24GBx2 memory kit running at 5,600MT/s. The mainboard was flashed with the latest AGESA 1222 BIOS. The said memory modules were placed in quad-channel mode and supported Intel XMP out of the box.

Unfortunately, no amount of tinkering made the system POST with the 24GB memory DIMMs. It’s worth noting that all Intel 12th and 13th Gen motherboards support these memory kits, allowing the installation of up to 192GB of DDR5 memory. The AMD AM5 boards, however, top out at 128GB with the current memory support.

The same is true for raw memory speeds. Intel Raptor Lake boards can hit clocks of up to 8,000 MT/s, but most Ryzen 7000 parts can’t exceed 6,400 MT/s. While it’s true that these features are relevant to only a very small fraction of users, AMD has been increasingly ignoring the DIY audience ever since it gained the gaming crown with Zen 3.


Computer hardware enthusiast, PC gamer, and almost an engineer. Former co-founder of Techquila (2017-2019), a fairly successful tech outlet. Been working on Hardware Times since 2019, an outlet dedicated to computer hardware and its applications.
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