Samsung
DDR5 · 6400 MT/s · CL52 · 1×64GB
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DDR5 server memory from Samsung generally spans a wide range of registered speed grades, and 6400 MT/s sits toward the faster end of what is currently validated on RDIMM platforms. That headroom mostly matters to boards that support it explicitly — a slower memory controller will simply run the module at its own validated rate instead.
The module here is 64GB as a single 1×64GB, DDR5 at CL52 timings in RDIMM. Server boards typically list exact part numbers or speed/capacity combinations they've validated, so the practical check is whether this specific configuration appears on your platform's support list rather than whether it is DDR5.
It is ECC memory and requires a board built for registered ECC; it will not train in a socket meant for consumer UDIMM.
Crucial Pro trades looks for a compatibility-first, overclocking-headroom pitch, and within this 6400 MT/s grade, CAS latency -- not the shared headline speed -- is the number that actually separates one listing from another.
FURY Beast at 6000 spans three CL grades under one name plus a four-module 64GB option its 5600 sibling doesn't offer, which makes matching the exact SKU more important here than with most families.
DDR5 doubled the bandwidth and moved power regulation onto the module. Whether that is worth paying for depends entirely on which platform you are building.
Flare X5 is a heatspreader-only DDR5-6000 line built for clearance-constrained builds, and within this 6000 MT/s grade every listing shares that one headline speed — the CL bin and capacity are the only things actually separating listings.
16 GB is no longer comfortable, 32 GB is the sensible default, and 64 GB is a workload decision rather than a future-proofing one.
CAMM2 and SODIMM are physically incompatible laptop memory formats. The difference is not speed at a given rating but how many channels each module carries, how the module attaches, and whether a machine can ever add memory rather than replace it.