PHS-memory
DDR5 · 6400 MT/s · CL52 · 2×32GB
Lowest price in GB across retailers
Out of stock in GB
PHS-memory is not a brand most builders will already know, and the CUDIMM format on this listing is the detail worth understanding before the name: CUDIMM is a clocked variant of unbuffered DDR5, built around an on-module clock driver that plain UDIMM doesn't have, and it only works in boards whose specification explicitly supports it.
Both capacities in this family run at the same rated 6400 MT/s CL52 — the choice here is between 64GB as 2×32GB rather than a trade-off in timing, since neither the clock nor the latency shifts as capacity goes up.
This is unbuffered, non-ECC DDR5 for a consumer desktop board, and the clock-driver requirement is the fitment check that actually matters: confirm CUDIMM support on the board itself, not just the socket.
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.
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.