16GB Total memory using 2pc of 8GB DDR3, 1600MHz, Non-ECC, CL11, 1R, X8, 1.5V, Unbuffered, DIMM, 240-pin Lifetime warranty for exchange. BRAND Computer Memory Solutions Guaranteed to work or you get all of your money back including shipping. Compatible with HP/Compaq Workstation Z220 CMT/SFF WILL WORK WITH ONLY Intel Core i3 / Intel C216 Intel Core i5 / Intel C216 Intel Core i7 / Intel C216 Intel Pentium / Intel C216 Intel Xeon / Intel C216 MAX MEMORY 32GB SOCKETS 4