Unlike standard UDIMMs that needs to constantly talk to the CPU's memory controller, CUDIMM comes with a CKD (Client Clock Driver) that lets the RAM maintain signal integrity and stabilizes memory operation at higher frequencies. EXPO 1.2 adds partial support for CUDIMM, allowing them to run in "bypass mode" that limits the speeds to around 6,000 MT/s despite being capable of achieving up to 9,000 MT/s.
Ryzen 7000, 8000G, and 9000 series processors don't natively support CUDIMM. So even though the motherboard will recognize it with new AGESA updates, the memory controller won't let the system boot without the bypass mode. Native CUDIMM compatibility is reportedly planned for next-gen Ryzen CPUs based on the Zen 6 architecture. In contrast, Intel's Arrow Lake chips have native CUDIMM support .
You may like AMD's memory-boosting EXPO 1.2 is here, adds support for three Chinese memory vendors MSI's $80 AMD motherboards with DDR4 support swoop in to rescue gamers amid the global RAM crisis ASRock launches new Frankensteined motherboard with one DDR4 slot and two DDR5 slots CUDIMM also brings Ultra-Low Latency mode for DDR5 memory, reducing it by five to seven nanoseconds. MRDIMM support is also being added for data center and server CPUs that should allow for much higher throughput. A more interesting feature for consumers is perhaps the added support for module geometry that can understand how the ICs are arranged on individual DDR5 sticks. This could enable HUDIMM support on AM5.
EXPO 1.2 is currently available on only AMD's latest 800-series motherboards across different vendors, but Asus has implied that older 600-series models, such as X670 and B650, could also get the updates soon. The screenshot above is from the ROG forums hosting the beta BIOSes, so this is not an official confirmation but a positive sign nonetheless for early adopters of the platform. Apart from the obvious CUDIMM omission, users should still be able to benefit from EXPO 1.2's other improvements.
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Reference reading
- https://www.tomshardware.com/pc-components/motherboards/SPONSORED_LINK_URL
- https://www.tomshardware.com/pc-components/motherboards/expo-1-2-only-brings-partial-cudimm-support-due-to-lack-of-native-imc-compatibility-asus-also-working-on-updating-older-b650-and-x670-boards-with-expo-1-2#main
- https://www.tomshardware.com
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