Handheld memory cards

The best memory cards for portable gaming devices in the UK depend on the console: the SanDisk microSD Express 256GB at £49.99 on Amazon UK at the time of writing (October 2026) is the pick for the Nintendo Switch 2, and the SanDisk Extreme microSD 256GB at £51.00 is the pick for UHS-I handhelds. The Switch 2 question is settled in Do I need a microSD Express card for Switch 2? and the console choice in Best gaming handheld UK 2026.

What makes a good memory card for portable gaming performance?

The slot decides the card type, and speed ratings come second. Nintendo UK states that the Switch 2 takes microSD Express cards only, while Valve lists the Steam Deck slot as UHS-I and ASUS lists a UHS-II reader on the ROG Xbox Ally. Four checks cover the rest:

• Interface. microSD Express runs over PCIe and NVMe. SanDisk states that its Express card drops to UHS-I speeds in UHS-I and UHS-II devices, so it earns its premium only in a Switch 2.
• A2 rating.A2 is the SD Association's application performance class, for installed games and apps that read and write small files. Both UHS-I picks here carry it.
• V30. Video Speed Class 30 is a sustained-write rating. The SanDisk Extreme microSD 256GB and the Lexar PLAY PRO Express 256GB both list V30.
• Capacity. Install sizes decide this: the Nintendo eShop UK lists Cyberpunk 2077: Ultimate Edition at 60.6 GB and Final Fantasy VII Rebirth at 91.5 GB.

1. SanDisk microSD Express 256GB - best for Switch 2

The SanDisk microSD Express 256GB is the cheapest way to add storage to the Nintendo Switch 2, at 19.5p per GB. SanDisk quotes a minimum sustained write of 210 MB/s, which is the figure that matters for a long game install, and the listing carries a lifetime warranty.

The compromise is speed against the Lexar PLAY PRO: 20 MB/s less read and 50 MB/s more write on maker figures, a difference no game load will show.

2. Lexar PLAY PRO microSDXC Express Card 256GB - fastest

The Lexar PLAY PRO reads fastest of the Express cards here, at 900 MB/s on Lexar's rating. It is £10.00 dearer than the SanDisk card for 20 MB/s more read, which is £0.50 per extra MB/s, so the premium buys a benchmark lead rather than a faster game.

3. SanDisk Extreme microSD 256GB - best for Steam Deck

The SanDisk Extreme microSD 256GB is the sensible card for the Steam Deck, whose slot Valve lists as UHS-I. It costs £51.00, only £1.01 more than the SanDisk Express card, and it adds the A2 and V30 ratings the Express card lacks. The ASUS ROG Xbox Ally has a UHS-II reader, so it takes the same card.

4. Lexar Play microSD 512GB - best for big libraries

The Lexar Play microSD 512GB doubles the capacity for £48.99 more than the SanDisk Extreme 256GB, which works out at 19.5p per GB against 19.9p. Eight 60.6 GB games fit on nominal capacity, against four on a 256 GB card.

Best memory cards for handhelds: spec sheet

Which handheld memory card costs least per GB?

The SanDisk microSD Express 256GB and the Lexar Play microSD 512GB tie at 19.5p per GB, and the Samsung P9 Express 256GB follows at 20.7p. The last column counts how many 60.6 GB games fit on nominal capacity.

The Express premium shrinks at 256 GB and grows at 512 GB. The SanDisk microSD Express 512GB costs £142.00, which is 27.7p per GB and £42.01 more than the Lexar Play microSD 512GB, so a Switch 2 owner pays for the interface the console demands, not for capacity.

How many games fit on each card?

Capacity is a budget decision measured in game installs. Compare Electronic worked the table below with a round 50 GB per large install, an illustrative figure and not a store measurement, and divided each Amazon UK price by the number of installs that fit, before formatting overhead. Real install sizes vary by title, so the pattern matters more than the exact count.

Per install, the cheapest Express card and the 512 GB UHS-I card tie at £10.00, while the 512 GB Express cards cost £12.00 to £13.60. A Switch 2 owner who wants ten installs pays £20.02 more with the Samsung P9 Express 512GB (£120.00) than with two SanDisk microSD Express 256GB cards (£99.98), though a single card keeps the library in one slot. Console context is in Is the Nintendo Switch 2 worth it?

Valve sells the Steam Deck with a 512GB or 1TB NVMe SSD and a UHS-I microSD slot, so a 512 GB UHS-I card doubles the smaller model's capacity for £99.99.

Does a faster card make games install quicker?

Only when copying from a PC, and never beyond the host's limit. Dividing a 60.6 GB game (60,600 MB) by each rated write speed gives the best case, and online downloads stay limited by the internet connection and the console, not by the card.

SanDisk's 210 MB/s minimum sustained write is the realistic floor for its Express card, and it still writes the game 1.6 times faster than the 130 MB/s UHS-I rating of the SanDisk Extreme microSD 256GB.

Which memory card does each handheld need?

The slot sets the answer, as the table shows. The Steam Deck is covered in Is the Steam Deck worth it? and Switch 2 add-ons in Best Nintendo Switch 2 accessories UK.

Who should skip each pick?

• Steam Deck and ROG Xbox Ally owners should skip both Express cards, which run at UHS-I speeds in those slots.
• Switch 2 owners who play mainly Nintendo games, which are small, can skip the 512 GB tier. The parent guide lists Mario Kart World at 22.2 GB.
• Buyers who want the Lexar PLAY PRO for speed should note that the SanDisk card is £10.00 cheaper and writes faster on maker figures.

Verdict

The SanDisk microSD Express 256GB at £49.99 is the best card for the Switch 2, and the SanDisk Extreme microSD 256GB at £51.00 is the best card for the Steam Deck and other UHS-I handhelds. Buyers with a large library should choose the Lexar Play microSD 512GB at £99.99. The Switch 2 rules are in Do I need a microSD Express card for Switch 2? and the console shortlist in Best gaming handheld UK 2026.