Console or handheld support
Valve lists the Steam Deck slot as UHS-I with SDXC support. Sandisk lists this card for microSDXC UHS-I hosts.
SanDisk Extreme microSDXC UHS-I 512GB
A widely sold A2 microSDXC card. Its 190MB/s read rating depends on proprietary readers, so a Steam Deck sees UHS-I speeds.
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512GB microSDXC UHS-I card
512GB microSDXC UHS-I card
What works. What doesn't.
Speed
Sandisk lists up to 190MB/s read and 130MB/s write for 512GB. Its footnote says speeds beyond UHS-I 104MB/s need compatible devices.
Capacity limits
Sandisk sells it up to 2TB. The 512GB version is SDXC, which Valve lists as supported.
Installation
We have not documented setup on Steam Deck for this card.
Read the bigger picture.
Game storageBuying guide
The best microSD card for Steam Deck is about capacity, not speed ratings
Steam Deck's UHS-I slot caps card speed near 104MB/s, so the 180MB/s and 205MB/s ratings on the box do not apply. Here is what to buy instead.