AMD launches EXPO 1.2 for CUDIMM and low-latency DDR5 memory, with ASUS among the first to enable support on X870 boards

AMD has officially launched version 1.2 of its Extended Profiles for Overclocking (EXPO). This release adds support for more memory profiles, CUDIMM, and other features. AMD overclocking tool developer 1usmus confirmed that this revision adds support for module geometry, allowing users to mix and match various memory capacities. CUDIMM and CSODIMM support are also part of the EXPO 1.2 roadmap, though CUDIMM support remains limited on current firmware.

For those unfamiliar, AMD's EXPO profiles make memory overclocking simple by offering pre-made speed and timing profiles that can be enabled to boost memory performance. With newer CUDIMM memory standards, which use a Client Clock Driver to stabilize higher memory frequencies, AMD has so far only offered support in "Bypass mode," which disables the onboard clock tuner and prevents sticks from running at higher rated speeds.

EXPO 1.2 does not change this yet. CKD bypass mode stays in place for now, although support is improving. The developer notes that the existing AGESA 1.3.0.0 and 1.3.0.1 BIOS releases include DDR5 CUDIMM support on AM5 motherboards, but it's not what you'd call "full." AMD is reportedly saving full support for Zen 6 and newer AM5 motherboards that are fully compatible with the memory technology.

MRDIMM or Multi-Ranked Buffered DIMM, on the other hand, is a separate DDR5 module standard designed for data center and enterprise systems, using an on-DIMM buffer and multiplexing to increase both bandwidth and capacity.

Elsewhere in the update, EXPO 1.2 also introduces new memory modes optimized for low latency, including EXPO memory kits with ULL (Ultra-Low-Latency) mode. This won't mean much to most gamers or casual enthusiasts, but for memory tuning specialists, it offers additional levers for overclocking and timing adjustments, enabling more capable memory overclocks down the line.

1usmus also states that AMD is working with Chinese DDR5 memory makers to expand its EXPO lineup in response to the ongoing DRAM shortage. The brands mentioned are RAMXEED, Rui Xuan (formerly known as Rei Zuan), and Fujitsu. These memory kits are expected to help address current shortages and rising prices affecting PCs, particularly in the budget and mainstream segments.

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AMD has not yet published a full list of vendor support, but EXPO 1.2 is already rolling out to some existing X870 motherboards for Zen 5. ASUS is among the first to enable support in new beta BIOS builds for its AM5 lineup, including the ROG Crosshair, Strix, ProArt, and TUF X870 series, under beta BIOS version 2301.