Hp 4UY12AA, 16 GB, DDR4 SDRAM, Speed 2666 MHz, DDR4-2666/PC4-21333, ECC, Unbuffered, 260-pin, FF SoDIMM, Thickness 156.7 mil. Boost the capabilities of your HP Mobile Workstation and improve system performance and application responsiveness with low-power, high-speed 16 GB 2666 MHz DDR4 memory from HP.