A-Tech
DDR4 · 2666 MT/s · CL19 · 2×16GB
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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.
2×16GB gives 32GB 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.
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.
A 2x16GB kit sits at the highest-volume point on the memory market, and volume is what actually sets price per gigabyte — not capacity, and not how new a kit's specification is.