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Valve currently sells three Steam Deck configurations, spanning a lower-capacity LCD model and two OLED models with 512GB and 1TB options. If you need extra room for a big game library or long trips away from Wi‑Fi, you can either add a microSD card or fit a higher‑capacity internal SSD.

  • Models and storage: Deck buyers may find themselves choosing between older lower‑capacity units and the newer OLED models that offer larger built‑in storage.
  • microSD vs SSD: microSD cards are simple and cheap for extra space, but internal SSDs offer greater capacity and stronger performance for demanding titles.
  • Installation and compatibility: upgrading to an internal SSD typically requires opening the handheld and checking form factor and interface requirements before purchasing.
  • When to upgrade: consider an SSD if you juggle many large installs, want faster load times, or frequently play graphically heavy games while away from home.
Source: Rock Paper Shotgun (https://www.rockpapershotgun.com/best-ssds-for-steam-deck)