AMD is set to enhance its CUDIMM DDR5 memory compatibility through forthcoming AGESA updates and the introduction of EXPO 1.2 technology. However, it’s important to note that this capability will only be available with the next-generation Ryzen CPUs.
Limited CUDIMM Support for DDR5 on AM5 Platforms; Exclusive to Next-Gen AMD Ryzen CPUs
The excitement around AMD’s EXPO 1.2 initiative has been growing, particularly with the release of new AGESA BIOS updates by ASUS for X870 series motherboards. These updates underscore the advancements in DDR5 memory support tailored for AM5 platforms.
In the wake of ASUS’s launch, further insights were shared regarding EXPO 1.2 and its features, which include not only CUDIMM and CSODIMM support but also various enhancements aimed at increasing compatibility with upcoming DDR5 modules. This technology introduces Ultra-Low Latency DDR5 kits, promising to optimize latency on AM5 systems.
However, a key insight from MSI engineer Toppc clarifies that the anticipated CUDIMM support will not be applicable to current AMD CPU lineups. This limitation arises from the Integrated Memory Controller (IMC) of existing processors.
The 1.2 CKD setting only defines whether CKD is enabled. If the CPU IMC doesn’t support it, it still won’t be supported. Setting it to enabled won’t prevent support. You can refer to the hardware information; this is a secret the motherboard manufacturer didn’t disclose.
Toppc – MSI Motherboard Engineer & In-House Overclocker
Toppc’s comments emphasize that, while support is being integrated into existing AM5 motherboards, effective utilization of DDR5 modules will only be possible with CPUs that possess CUDIMM support as part of their IMC. Currently, AMD’s Ryzen CPUs lack this specific capability.
These future Ryzen processors are expected to support CUDIMM memory; however, they will operate in a “Bypass”mode, limiting speeds to approximately 6000 MT/s (equivalent to 3000-3600 MHz effective).This configuration still allows for booting with CUDIMM modules, albeit at reduced performance levels.
Similar situations exist with earlier Intel platforms, meaning that regardless of possessing CUDIMM DDR5 memory or an AM5 motherboard capable of CUDIMM, users will need an upcoming AMD Ryzen CPU that includes IMC support to experience the full benefits. Such CPUs are anticipated with the next-generation Ryzen series leveraging the Zen 6 architecture. Hence, motherboard manufacturers and memory developers are proactively working on enhancing CUDIMM support for AM5 platforms as AMD continues its technological evolution.
In addition, ASUS is teasing support for EXPO 1.2 on their older 600-series motherboards, like the X670 and B650 series. The manufacturer has also rolled out EXPO 1.2 BIOS updates for its B850 motherboards. While some tuning is necessary for these older models, the inclusion of EXPO support showcases the long-term viability and adaptability of the AM5 platform for builders focusing on future-proofing their systems.
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