Crucial P310 2TB SSD Best 2TB Steam Deck SSD in 2026 Our expert review: Specifications Capacities: 1TB, 2TB Form Factor: M.2 2230 Transfer Interface/Protocol: PCIe 4.0 x4 / NVMe 2.0 Sequential Reads/Writes: 7,100 MBps / 6,000 MBps Warranty/Endurance: 5 Years / 440 TBW Today's Best Deals View at Amazon Reasons to buy + High performance + Excellent power efficiency + New controller with faster QLC NAND Reasons to avoid - Pricing and availability - QLC still slower than TLC PCIe 3.0 testing helps gauge performance on older systems or even Windows on the Steam Deck, while PCIe 4.0 testing lets the drives open up to their full potential and may reflect performance on the ASUS ROG Ally. Most of the 2TB drives that we've tested use QLC NAND, which can impact performance more as a drive fills up.