ASUS and MSI have begun releasing UEFI firmware updates for AMD 600-series motherboards that add support for AMD EXPO-ULL memory profiles. The new profile type is intended to simplify the use of lower-latency DDR5 configurations on AM5 systems. EXPO-ULL is an SPD-based extension that allows memory vendors to define tighter DDR5 settings in a more standardized way. Rather than increasing memory frequency, the focus is on improving latency within existing speed classes. One example would be DDR5-6000 running at CL26, compared with the CL30 or CL36 timings commonly found on many DDR5-6000 kits. This approach is relevant for Ryzen 7000 and Ryzen 9000 processors, where DDR5 tuning often centers around latency and stability rather than very high clock speeds. AM5 systems can benefit from tighter timings, but manual memory tuning is not always practical for typical users. EXPO-ULL gives motherboard firmware a preset-based method to apply these settings, provided the memory kit includes a compatible profile.

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ASUS is introducing support through Beta BIOS 3803 for several X670E motherboards. The rollout covers models from the ROG Crosshair, ROG Strix, ProArt, and TUF Gaming product lines. MSI has released a similar update for the MEG X670E GODLIKE. Both firmware updates include AMD AGESA 1.3.0.1b. The update does not guarantee lower latency on every memory kit. The final configuration depends on the module’s DRAM ICs, vendor validation, motherboard firmware, PCB layout, and the memory controller quality of the installed Ryzen processor. However, for compatible kits, EXPO-ULL should make low-latency DDR5 profiles easier to apply and validate. More motherboard vendors are expected to follow, as EXPO-ULL support is not restricted to a single AMD chipset generation.

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Source: ITHome