AMD Launches EXPO 1.2 for CUDIMM and Low-Latency DDR5 Memory

AMD has officially launched its Extended Profiles for Overclocking (EXPO) version 1.2, which expands support for more memory profiles, CUDIMM, and additional features. With this release, AMD aims to introduce more advanced memory tuning profiles to the “Zen 5” platform and its DDR5 memory types, while full support for EXPO 1.2 features is anticipated with the “Zen 6” processor generation. This means that full CUDIMM support for “Zen 5” tuning is still limited, and only “Zen 6” will offer complete CUDIMM support. EXPO 1.2 works with AMD’s AGESA, but since AGESA 1.3.0.1 lacks full CUDIMM DDR5 support, this feature is postponed until the next-generation “Zen 6.” Current-generation “Zen 5” CPUs on the AM5 socket may be able to use EXPO 1.2, but they won’t fully support the new DDR5 memory with an onboard clock driver, instead relying on traditional memory to perform the task. Notably, popular AMD developer 1usmus mentioned that AMD EXPO 1.2 brings the following changes.

• Support for module geometry.
• Added support for MRDIMM (CUDIMM and CSODIMM are already supported). AGESA 1.3.0.1 still lacks full CUDIMM support; AMD is preparing this for Zen 6.
• New! tREFI, tRRDS, tWR, ULL Enable—Unified Latency Lock and VDDP(V).

Finally, AMD is adding Chinese memory makers to EXPO 1.2 as DRAM shortages are prompting customers to seek alternatives to traditional consumer DRAM kits. These include brands such as RAMXEED Limited Conexant, Rui Xuan (formerly known as Rei Zuan), and Fujitsu Synaptics. AMD EXPO 1.2 is now being rolled out to some existing X870 motherboards for “Zen 5,” although CUDIMM support is only partial, and details about it are still limited. These boards include the ASUS ROG CROSSHAIR/STRIX/PROART/TUF X870 Series with beta BIOS version 2301.