ADATA/MSI 128GB 4-Rank DDR5 CUDIMM “Validated On Z890” — Two Sticks Could Reach 256GB, JEDEC Targets 7200 MT/s

GigaNectar Team

Updated on:

HardwareTechnology
ADATA AX3U2000GC4G9B-DG2 DDR3 desktop RAM module on a white background
Quad-rank DDR5 · CQDIMM · Local AI
How 128GB 4-Rank DDR5 CUDIMMs and JEDEC’s CQDIMM planning enable 256GB desktops

ADATA and MSI announced a 128 GB four-rank DDR5 CUDIMM validated on MSI Intel Z890 platform and positioned for high-capacity desktop builds. JEDEC’s work on clock-driver (CKD) DIMMs aims to standardize higher client speeds (initial CKD targets include 7200 MT/s with future targets higher). SK hynix has described stacked DRAM+NAND packages (High Bandwidth Storage concepts) for mobile and AI use.

Two 128 GB modules can reach 256 GB in two-slot desktops, subject to motherboard firmware and vendor qualified-vendor-lists (QVL). Vendors report internal lab tests at very high data rates under specialized conditions; those figures are vendor test results and not JEDEC consumer speed guarantees.

CUDIMM Origins
Clock-driver DIMMs first focused on speed
Early CUDIMMs were developed to preserve clock signal integrity for very high DDR5 rates (vendors offered ultra-high speed kits). Clock drivers regenerate the DIMM clock locally to help maintain stability at elevated data rates.
Today
ADATA & MSI: 128GB four-rank DDR5 CUDIMM
ADATA and MSI confirmed a 128 GB four-rank DDR5 CUDIMM tested on MSI Z890 development boards. Vendors describe client use cases such as offline model inference and heavy media editing workflows.
JEDEC work
Clock-driver (CKD) specs and raw card designs
JEDEC has published CKD specifications and an ongoing raw-card DIMM initiative to formally support clocked DIMMs at higher client speeds. Initial CKD targets include 7200 MT/s with later revisions aiming for higher rates; platform vendor validation remains required.
Packaging trends
SK hynix stacked DRAM + NAND (HBS / VFO)
SK hynix official materials cover next-gen packaging (VFO / stacked dies) and concepts like High Bandwidth Storage (HBS) that combine DRAM and NAND into a stacked package. Industry use cases include mobile AI and compact devices.
Trade coverage uses the term “CQDIMM” to describe a quad-rank CKD (clock driver) client DIMM concept. JEDEC has published CKD/CUDIMM specifications and is developing raw-card designs; however, trade names reported in press may precede final JEDEC nomenclature. Confirm official JEDEC naming and documents at JEDEC’s releases. (Link in primary sources above.)
No. Support is platform and firmware dependent. ADATA and MSI validated 128-GB modules on MSI Z890 development boards; motherboard QVLs and BIOS updates determine real-world compatibility. Check vendor QVL and firmware notes before purchase.
Vendors may report internal lab or burn-in test speeds higher than JEDEC consumer speed bins. These internal tests demonstrate feasibility under test conditions; they do not imply guaranteed retail speed ratings without JEDEC bins and vendor support.
Quick planner: Select target system memory (GB)
128 GB
Modules: 1 × 128GB
Single-DIMM 128 GB is available as a four-rank DDR5 CUDIMM validated by ADATA/MSI for Z890. Two-DIMM 256 GB requires a platform with QVL/BIOS support for two 128 GB modules.

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