Best microSD Cards for Steam Deck & Switch 2 (2026)

The two most popular gaming handhelds now want opposite things from a memory card, and 2026 buyers keep getting burned by treating them as one purchase. Nintendo's Switch 2 will not accept any traditional microSD card for game storage — its own support documentation is blunt on the point. Valve's Steam Deck, meanwhile, cannot pull more than 104MB/s from any card you insert, so every dollar spent on speed there is a dollar wasted. The correct question is not "which card is best" but "which card is best for which machine." On the Switch 2, you are shopping for a microSD Express card, a newer standard Nintendo adopted specifically for faster access speeds. On the Steam Deck, you are shopping for capacity at the lowest cost per gigabyte, because the hardware capped speed years ago. This guide covers what each console supports, what a card does once it is installed, where the measured performance numbers land, and which capacities make sense. It also covers the traps: the system update Nintendo requires before an Express card works at all, the old Switch card in your drawer that will not do what you hope, and the expensive UHS-II cards that cannot hold Switch 2 game data.

Two Consoles, Two Card Standards — Read This First

Start with the split, because it defines everything else. Nintendo states plainly that the Switch 2 is only compatible with microSD Express cards, and that only Express cards can save game data, screenshots and videos on the new console. A standard microSD card from an older handheld — the UHS-I card nearly everyone already owns — cannot hold Switch 2 games. Valve's handheld sits at the other pole. Both the Steam Deck LCD and OLED carry a UHS-I interface that supports microSD, SDXC and SDHC cards, and the Deck's controller supports only UHS-I speeds, capping the bandwidth it can use off a card at 104MB/s. Valve ships the OLED 512GB and 1TB Deck models with mostly consistent specs across the lineup, so one rule covers all of them. The buying advice is simple: treat these as two separate purchases. There is no single card that is the right answer for both machines, because the machines bottleneck in opposite places — the Switch 2 rewards the newer, faster standard, while the Deck cannot use speed beyond a ceiling it hit on day one. Advice telling you to buy one fast card and shuttle it between consoles fails on both ends.

Switch 2: microSD Express or Nothing

Nintendo chose microSD Express for the Switch 2 for one reason: speed. The company adopted the standard specifically because it moves data faster than the cards the original Switch accepted, and the measured numbers back the decision. In the Switch 2's card slot, top microSD Express cards are rated up to 880MB/s. UHS-II cards — the premium tier, which has a maximum bus speed of 312 MB/s and costs accordingly — cannot hold Switch 2 game data. Read that twice, because it is the most counterintuitive fact in handheld storage right now: the expensive card you might buy for a camera or a laptop is worth zero for game storage in a Switch 2. The console will read a non-Express card, but only for the handoff — importing screenshots and videos saved on an original Switch into the Switch 2's system memory — and that is the entire job.

The second thing buyers need to internalize is that no card comes in the box. microSD Express cards are sold separately, and the 256GB of internal UFS storage is all the storage a Switch 2 includes. For a digital buyer — which most Switch owners now are — 256GB does not survive contact with a modern release schedule. Large downloads, third-party ports, and the screenshots and video clips the console captures along the way crowd internal storage quickly. An Express card is not an accessory for this machine. It is the plan.

What the Card Holds — and What It Never Will

Here is the detail that surprises even experienced Nintendo owners: game saves will never live on the card. On the Switch 2, game save data is stored to the system memory and cannot be copied or saved to a microSD Express card. The card's job is downloadable game data, screenshots and captured video — nothing else. That division has two practical consequences. First, a failed card costs you games, which are re-downloadable, and media — not progress. Saves stay protected on the console itself. Second, it reframes the capacity question. You are sizing the card for your installed library, not for progress data, so the decision comes down to how many large downloads you keep installed at once.

The other constraint is Nintendo's own recommendation: use a single microSD Express card with the console. Treat that as binding rather than advisory — multi-card swapping is not the supported flow, so capacity should be bought once, with headroom. The console accepts any card up to 2TB that meets the microSD Express standard, which sets the ceiling. It also sets a floor on ambition: nobody buying a Switch 2 card in 2026 should be sizing below 512GB.

Steam Deck: Buy Cheap, Buy Big

Everything about Steam Deck card shopping inverts the Switch 2 logic. Valve's handheld works with pretty much any microSD card you can buy: the microSDXC slot supports the UHS-I bus natively and accepts SDXC and SDHC cards, and every 2TB microSDXC card on the market uses that same UHS-I interface. Both Deck generations behave identically here — the LCD and OLED carry the same UHS-I interface — and specs are consistent across the OLED 512GB and 1TB models that Valve ships now, so one recommendation covers every Deck in circulation.

But the ceiling is the ceiling. The Deck's microSD controller supports only UHS-I speeds, and the maximum bandwidth it can use off an SD card is 104MB/s. A card rated faster is not faster in a Deck; the hardware stops listening past 104MB/s. That is why the strategy is to spend nothing on speed and everything on capacity. The OLED line includes a 512GB console model, and even that fills faster than people expect once a Steam library starts installing locally. A big, inexpensive, dependable UHS-I card is the play — 512GB if you rotate your library actively, 1TB if you would rather install a season's worth of games and forget about it. Anyone selling a premium-rated card for a Steam Deck is selling performance the console cannot retrieve.

The Load-Time Argument That Should End the Debate

The reflexive objection to cheap cards is load times, and on the Steam Deck that objection mostly dies on contact with the data. Early devkit testing by The Phawx and Linus found very little difference in most games, though a few titles showed worst-case SD penalties of 12–17 seconds. The game Control made the same point: it reached its main menu from the SD card a split-second behind the SSD. A split second — on one of the heavier-loading games of its generation — through a 104MB/s UHS-I pipe.

That result is the entire argument for this guide's Steam Deck position. If the SSD and a UHS-I card land close enough that testers could not reliably separate them, then every card tier above "dependable UHS-I" is paying for a difference no one will perceive on a handheld played on a couch or a plane. The money argument flips, too. On a Switch 2, the premium Express card buys real, measurable bandwidth. On a Steam Deck, the premium buys nothing the hardware can express. Spend the difference on capacity, or do not spend it at all.

Sizing the Card for Each Machine

Capacity, machine by machine. On the Switch 2, the internal 256GB of UFS storage is the baseline and the Express card is where the library actually lives. Because Nintendo recommends a single card per console, buy the size you will need in two years, not the size you need today. Digital buyers should treat 512GB as the sensible floor, and 1TB as the right target for anyone who keeps more than a few large games installed at once. The console supports cards up to 2TB, and hoarders can go there, but Express-class cards at that size carry a real premium.

On the Steam Deck, the same sizes exist at ordinary microSD prices. The OLED's 512GB internal model covers a healthy slice of a library, but local installs accumulate quickly on a machine people use for everything from small indies to big modern ports, so a 512GB card is the practical minimum and 1TB is the comfort pick. The same UHS-I interface covers every 2TB microSDXC card on the market. Identical advice to the Switch 2, at a fraction of the cost per gigabyte — which is precisely the point of knowing which machine you are feeding.

Setup Traps and the Card in Your Drawer

Two logistics details catch people every launch season. First, the Switch 2 requires a system update delivered over an internet connection before microSD Express cards work at all. A console that has never been online will not recognize the card — connect it, update it, then insert the card. It is a five-minute fix that generates outsized confusion, particularly for anyone setting up away from home.

Second, the drawer card. The plain microSD card from an original Switch cannot hold Switch 2 game data; Nintendo limits non-Express cards on the new console to copying screenshots and videos from the original machine. There is a supported handoff: media saved on an original Switch's microSD card can be imported into the Switch 2's system memory. So the old card gets one final job — a media transfer — and then retirement. The good news runs the other direction as well: microSD Express cards work in the original Switch, so the card you buy for the Switch 2 is not stranded if you keep a first-gen console around, or if you eventually sell the newer machine and return to the older one.

For the Switch 2: buy a microSD Express card, full stop. Nothing else can hold game data, screenshots or videos on the console, and UHS-II cards cannot be used for that job despite costing more elsewhere. Buy from a major manufacturer, and verify that "Express" is printed on the card itself rather than only on the store listing, because the label on the product is the only claim that matters once the card is in the slot. Size it between 512GB and 1TB, treat the purchase as a one-time decision, and expect Express-class pricing to run above ordinary microSD per gigabyte — the up-to-880MB/s card read ratings are what the premium buys.

For the Steam Deck: buy a plain, reputable UHS-I microSDXC card and spend the savings on capacity. Anything rated above UHS-I is wasted, because the Deck tops out at 104MB/s from its slot, and load times from a dependable card land within a second or two of the SSD in most testing. Both generations behave identically, and every 2TB microSDXC card on the market uses the same UHS-I interface.

One rule holds for everyone: stop trying to make one purchase serve both machines. The Switch 2 refuses every ordinary microSD card for game data; the Steam Deck cannot use anything faster than its UHS-I ceiling. Shop for each console separately — bandwidth on the Switch 2, raw capacity on the Deck — and both purchases get better and cheaper at the same time. Once storage is settled, the same machine-first logic applies to the controllers you pair with each handheld.