ADATA
DDR5 · 6400 MT/s · CL40 · 2×16GB
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XPG is ADATA's gaming-oriented sub-brand, and Caster is its RGB DDR5 kit — a single listing here at 6400 MT/s CL40, sold as 2×16GB for 32GB total.
There's no capacity range to weigh in this family, so the practical checks are the usual ones for a lit kit: clearance under a tower cooler, and confirming the board actually reaches the rated speed once its XMP or EXPO profile is turned on rather than left at its default setting.
It's standard UDIMM for a consumer desktop board, nothing registered or server-oriented about it, and no capacity decision to make beyond the single configuration listed.
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.