Integral 512GB Micro SD Card 4K Video Premium High Speed Memory Card SDXC Up to 100MB s Read Speed and 50MB s Write speed V30 C10 U3 UHS-I A2 : Amazon.co.uk: Computers
SD Card Speed = 90MB/s Easily - PS4+XBOX1 Were using Slow Laptop 5400RPM 70MB/s~ most of your library (99.9%) will run just fine on Steam Deck (Just slower loading) the 399$ Model
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Understanding SD Card Speeds, Types and Important Symbols