Cheapest desktop RAM ranked by price per GB

Buying desktop RAM in 2026: what actually matters

Desktop memory comes as full-size DIMMs (288 pins for DDR4 and DDR5, 240 for DDR3) and fits any tower or mini-tower PC with standard slots. The table above lists 1,735 desktop kits from Amazon.co.uk ranked by real price per gigabyte, from £1.81/GB at the top to £147.69/GB for the fastest enthusiast sets, with a median of £9.25/GB. The cheapest kit right now is PC3L 10600U DDR3L 1333MHz 16GB Kit (2x8GB) UDIMM RAM CL9 1.35V 240-Pin… at £28.99.

Three things decide what you can actually fit, and the listing title tells you all three:

• Generation. DDR5, DDR4 and DDR3 are physically keyed differently and will not go in the wrong slot. Your motherboard supports exactly one. AMD AM5 and Intel boards from the 700-series onward are DDR5; AM4 and most 12th to 14th-gen Intel boards are DDR4; anything older than about 2015 is DDR3.
• Kit size and channels. Two matched sticks run in dual channel, which is worth 10 to 20 percent in games and memory-heavy work compared with one stick of the same total. That is why a 2x8GB kit usually beats a single 16GB stick at the same price. Four sticks on a two-slot-per-channel board can force lower speeds on DDR5, so 2x16GB or 2x32GB is the safer route to 32GB or 64GB.
• Speed and latency. Speed is the MHz (or MT/s) figure; latency is the CL number. For DDR4, 3200MHz CL16 is the value sweet spot and 3600 CL18 the enthusiast one. For DDR5, 6000MHz CL30 is the target on AM5 and 5600 to 6400 on Intel. Faster kits cost more per GB and the gains beyond those points are small outside benchmarks.

How much desktop RAM do you need?

16GB is the floor for a modern Windows PC and enough for office work and most games. 32GB is the sensible default for a new gaming or creative build in 2026: several current titles recommend it, browsers and Discord eat a surprising amount, and the price gap from 16GB is small per GB. 64GB is for video editing, virtual machines, large photo libraries and heavy multitasking. 128GB is workstation territory and usually means four sticks or two 64GB modules.

Reading the table

The For column marks kits detected as desktop, laptop, Mac or server memory from the listing text, and the ECC and Buffered columns flag the server-only types. If a kit says ECC or Registered it belongs on the server page, not in a consumer board. Kits with a green best £/GB pill are the cheapest per gigabyte within their generation and form factor among the rows shown, and a gold star marks an all-time-low price. Use the filter bar to pin the generation your board takes and the capacity you want, then let the ranking do the rest.

Brand rarely changes much at the same speed and latency: Corsair, Crucial, Kingston, G.Skill and TeamGroup all buy their chips from the same three DRAM makers. Pay for a brand when you want a specific look, RGB, or a low-profile heatspreader that clears a big air cooler, not for speed.