1pcs of 4GB DDR3, DDR3, 1600MHz, Non-ECC, CL11, 1R, X8, 1.5V, Unbuffered, SODIMM, 204-pin CM5126412800SR15VSO0201 Compatible with: HP ENVY TouchSmart 20-d001la, 20-d003la, 23-d015la Max memory 16GB Sockets 2