Kingston
DDR4 · 3200 MT/s · CL20 · 2×8GB
Lowest price in GB across retailers
This DDR4 generation of FURY Impact runs at one fixed speed grade across the whole family, which makes capacity and module count the things that actually change from listing to listing — Kingston sells it from a single small stick up through large matched pairs for laptops and mini-PCs with room to spare.
2×8GB of DDR4 SODIMM gives 16GB in this listing, and every kit under this name shares the same rated 3200 MT/s CL20 — so the choice here really is about how much memory you need and whether your machine has one SODIMM slot free or two. A single-stick upgrade leaves a laptop in single-channel until a second module is added, so check your machine's documentation for how much it supports before buying toward the top of this range.
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.
Whether a laptop can be upgraded at all depends entirely on which of three physical memory formats it uses, and that has to be confirmed before comparing a single spec sheet.
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.