2PC OF 4GB DDR3L, 1600MHz, Non-ECC, CL11,, X8, 1.35V, Unbuffered, SODIMM, 204-pin We don't use Generic module to avoid incompatibility. by Computer Memory Solutions Brand Computer Memory Solutions Guaranteed to work in your notebook or you get your money back.
MAX MEMORY: 8GB
SOCKETS: 1 OR 2
Compatible with: Lenovo ThinkPad Edge E520, ThinkPad Edge L330, ThinkPad L421, U31 Series