A-Tech
DDR4 · 2666 MT/s · CL19 · 2×4GB
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This A-Tech family holds speed and timings fixed and lets capacity do the moving — every kit here is rated at the same grade, and what changes from listing to listing is how many modules are populated and how large each one is, from a pair of small sticks up to four larger ones.
2×4GB gives 8GB in this listing at the family's common 2666 MT/s CL19. A four-module set draws on every slot a board has at once, which is a heavier load on the memory controller than reaching the same total capacity with two larger sticks instead — worth factoring in if you're also planning to overclock elsewhere.
It's DDR4 UDIMM, unbuffered and non-ECC, built for standard desktop boards rather than anything requiring registered memory.
Vengeance LPX earns its long shelf life through breadth and a low-profile heatspreader, not through any single standout spec — the timing bin on the specific listing is what actually decides whether a given kit is a good buy.
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.
A dying memory generation does not get cheaper on its way out — it gets more expensive, because the economics of end-of-life manufacturing are the opposite of the economics of a maturing one.
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.
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.
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.