Netac N950E Pro 250GB M.2 NVMe* Form Factor: M.2 2280 * Interface: NVMe – PCIe 3.1 x4* External DDR buffer for performance optimization: 256MB to 2GB* Sequential R/W: up to 3510MB/3148MB/S * Support LDPC ECC* SLC Caching for instant full-speed write acceleration