Kingston 4GB 2133 M Hz DDR4 Non-ECC CL15 DIMM SR x 8 Value RAM's 512M x 64-bit (4GB) DDR4-2133 CL15 SDRAM (Synchronous DRAM), 1 Rx 8, memory module, based on eight 512M x 8-bit FBGA components. The SPD is programmed to JEDEC standard latency DDR4-2133 timing of 15-15-15 at 1.2V. Each 288-pin DIMM uses gold contact fingers.