What Is MRDIMM Memory? UDIMM vs RDIMM vs MRDIMM
MRDIMM (multiplexed-rank DIMM) is a high-bandwidth DDR5 server memory module. It combines the data from two ranks and sends it over the memory bus at a higher rate than standard DDR5, with speeds of up to 8,800 MT/s on supported platforms. It is built for bandwidth-hungry workloads such as AI, high-performance computing and in-memory databases.
UDIMM vs RDIMM vs MRDIMM
| UDIMM | RDIMM | MRDIMM | |
|---|---|---|---|
| Built for | Desktops, small servers, NAS | Mainstream servers | Bandwidth-sensitive servers |
| Buffering | None | Register on command and address lines | Register plus multiplexing of two ranks |
| Strength | Low cost, low latency | Capacity and reliability | Highest bandwidth |
| Platform support | Consumer and entry-level boards | Most Xeon and EPYC servers | Only platforms that list it, such as Intel Xeon 6 |
What to Know Before Buying MRDIMM
- It is a separate module class, not a faster RDIMM. The CPU and motherboard must support it.
- Do not mix it with RDIMM or UDIMM.
- The benefit is largest when memory bandwidth, not capacity, limits your workload.
Frequently Asked Questions
What does MRDIMM stand for?
Multiplexed-rank dual in-line memory module.
Can I use MRDIMM in a desktop?
No. It is a server module that needs a platform built for it.