Crucial
DDR5 · 6400 MT/s · CL52 · 2×16GB
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Crucial sells this kit as CUDIMM rather than the more common UDIMM — a newer DDR5 module standard that adds an on-board clock driver to help reach higher speeds reliably, and it's the form factor here that matters more than the brand name.
Both listings in this family are rated 6400 MT/s at CL52, and the difference between them is purely how the 32GB is built: one uses a single module, the other splits the same total into 2×16GB. Because CUDIMM depends on platform support for its clock-driver feature, confirm your motherboard and chipset explicitly support CUDIMM before buying — it isn't guaranteed to behave like a standard UDIMM in every board.
There's no ECC or registered variant in this range; it's a consumer desktop part built for systems that support the newer module type.
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.
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.
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.
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.
Capacity avoids stutter caused by running out of memory; speed affects how efficiently the CPU feeds data to the GPU. They solve different problems, and buying enough of the first one before spending on the second is the right order.