XPG GAMMIX S55 PCIe Gen4x4 M.2 2230 Solid State Drive GAMMIX S55 features a PCIe 4.0 interface, with sequential read and write speeds of up to 5,000/3,800MB per second, and up to 1TB storage capacity. Adopting a M.2 2230 form factor, the GAMMIX S55 delivers high-end storage to small systems, handheld and supports the latest Intel and AMD platforms.