HP Z4Y85AAR, 8 GB, 1 x 8 GB, DDR4, 2400 MHz, 260-pin SO-DIMM HP Z4Y85AAR. Component for: Laptop, Internal memory: 8 GB, Memory layout (modules x size): 1 x 8 GB, Internal memory type: DDR4, Memory clock speed: 2400 MHz, Memory form factor: 260-pin SO-DIMM