Subsequent-Era CAMM, MR-DIMM Reminiscence Modules Present Up at Computex

Dynamic random entry reminiscence is an indispensable a part of all computer systems, and necessities for DRAM — resembling efficiency, energy, density, and bodily implementation — have a tendency to alter every now and then. Within the coming years, we are going to see new varieties of reminiscence modules for laptops and servers as conventional SO-DIMMs and RDIMMs/LRDIMMs appear to expire of steam when it comes to efficiency, effectivity, and density.

ADATA demonstrated potential candidates to exchange SO-DIMMs and RDIMMs/LRDIMMs from consumer and server machines, respectively, within the coming years, at Computex 2023 in Taipei, Taiwan, experiences Tom’s Hardware. These embody Compression Hooked up Reminiscence Modules (CAMMs) for no less than ultra-thin notebooks, compact desktops, and different small form-factor purposes; Multi-Ranked Buffered DIMMs (MR-DIMMs) for servers; and CXL reminiscence enlargement modules for machines that want additional system reminiscence at a value that’s under that of commodity DRAM.


The CAMM specification is slated to be finalized by JEDC later in 2023. Nonetheless, ADATA demonstrated a pattern of such a module on the commerce present to spotlight its readiness to undertake the upcoming expertise.

Picture Courtesy Tom’s Hardware

The important thing advantages CAMMs embody shortened connections between reminiscence chips and reminiscence controllers (which simplifies topology and subsequently permits larger switch charges and lowers prices), utilization of modules primarily based on DDR5 or LPDDR5 chips (LPDDR has historically used point-to-point connectivity), dual-channel connectivity on a single module, larger DRAM density, and decreased thickness when in comparison with dual-sided SO-DIMMs. 

Whereas the transition to an all-new sort of reminiscence module would require super effort from the business, the advantages promised by CAMMs will probably justify the change. 

Final yr, Dell was the primary PC maker to undertake CAMM in its Precision 7670 notebook. In the meantime, ADATA’s CAMM module differs considerably from Dell’s model, though this isn’t surprising as Dell has been utilizing pre-JEDEC-standardized modules.


Datacenter-grade CPUs are rising their core rely quickly and subsequently must help extra reminiscence with every era. However it’s exhausting to extend DRAM gadget density at a excessive tempo on account of prices, efficiency, and energy consumption issues, which is why together with the variety of cores, processors add reminiscence channels, which ends up in an plentiful variety of reminiscence slots per CPU socket and elevated complexity of motherboards.

Because of this the business is creating two varieties of reminiscence modules to exchange RDIMMs/LRDIMMs used in the present day. 

On the one hand, there’s the Multiplexer Combined Ranks DIMM (MCR DIMM) expertise backed by Intel and SK Hynix, that are dual-rank buffered reminiscence modules with a multiplexer buffer that fetches 128 bytes of knowledge from each ranks that work concurrently and works with reminiscence controller at excessive velocity (we’re speaking about 8000 MT/s for now). Such modules promise to extend efficiency and considerably simplify constructing dual-rank modules considerably. 

Picture Courtesy Tom’s Hardware

However, there’s the Multi-Ranked Buffered DIMM (MR DIMM) expertise which appears to be supported by AMD, Google, Microsoft, JEDEC, and Intel (no less than primarily based on info from ADATA). MR DIMM makes use of the identical idea as MCR DIMM (a buffer that permits the reminiscence controller to entry each ranks concurrently and work together with the reminiscence controller at an elevated knowledge switch price). This specification guarantees to start out at 8,800 MT/s with Gen1, then evolve to 12,800 MT/s with Gen2, after which skyrocket to 17,600 MT/s in its Gen3.

ADATA already has MR DIMM samples supporting an 8,400 MT/s knowledge switch price that may carry 16GB, 32GB, 64GB, 128GB, and 192GB of DDR5 reminiscence. These modules will likely be supported by Intel’s Granite Rapids CPUs, in keeping with ADATA.

CXL Reminiscence

However whereas each MR DIMMs and MCR DIMMs promise to extend module capability, some servers want quite a lot of system reminiscence at a comparatively low value. Right this moment such machines need to depend on Intel’s Optane DC Persistent Reminiscence modules primarily based on now out of date 3D XPoint reminiscence that reside in commonplace DIMM slots. Nonetheless, sooner or later, they are going to use reminiscence on modules that includes a Compute Express Link (CXL) specification and linked to host CPUs utilizing a PCIe interface.

Picture Courtesy Tom’s Hardware

ADATA displayed a CXL 1.1-compliant reminiscence enlargement gadget at Computex with an E3.S kind issue and a PCIe 5.0 x4 interface. The unit is designed to broaden system reminiscence for servers cost-effectively utilizing 3D NAND but with considerably decreased latencies in comparison with even cutting-edge SSDs.

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