Will this memory fit your laptop?
Check three things before you buy: the type (DDR4 or DDR5), whether your laptop has SO-DIMM slots, and the largest capacity the maker supports. The spec sheet or service manual for your exact model lists all three. A laptop takes the type its board was designed for, and DDR4 and DDR5 modules do not fit each other's slots.
SO-DIMM is the compact module used in laptops and small PCs. A Kingston FURY Impact DDR5 SO-DIMM, for instance, measures 69.6 mm by 30 mm. The kits on this page are laptop modules only. For desktop sticks, see the DDR5 and DDR4 price pages.
Soldered memory and Macs
Many slim laptops use soldered memory that cannot be swapped. If your spec sheet says so, nothing on this page will help, and the amount you bought is the amount you keep. JEDEC published the CAMM2 standard in December 2023 as a replaceable alternative to soldered LPDDR, but it is a different shape and does not fit an SO-DIMM slot.
Apple silicon Macs are the firmest case. Apple says memory is part of the chip package and cannot be upgraded, so pick the amount at purchase.
Which laptop kit to buy
Match the type and speed your laptop uses, and buy a matched pair if it has two slots, since two modules run in dual channel. The sensible floor for a current Windows laptop is 16GB, and 32GB helps with many browser tabs, virtual machines and editing. UK shops list fewer laptop kits than desktop ones, with 39 DDR5 and 70 DDR4 laptop kits in stock this week, so stock can run out of your exact size. Prices include VAT.
If both slots hold a module, you replace rather than add. Weigh the value of the modules you remove against the cost of the new kit.