The HP 3PL81AT RAM module is compatible with HP Z4 G4 workstations. It has high-speed 8GB DDR4 SDRAM memory with 2666 MHz speed, for improved performance without straining the system’s power needs. This 288-pin DIMM unbuffered memory module has a supply voltage of 1.2 V. The non-ECC memory module improves start-up times with fewer delays during routine operations and runs more programs simultaneously..Unbuffered.RAM module is compatible with HP Z4 G4 workstations and increases system performance as well as responsiveness of applications.Memory voltage: 1.2 V.Improves start-up times with fewer delays during routine operations, run more programs simultaneously and easily toggle between them.Non-Error Correcting Code (ECC) memory.Speed: 2666 MHz.1 x 8GB SDRAM module.Memory specification compliance: PC4-21300.Form factor: 288-pin DIMM.Dimensions: 0.14 cm H x 13.33 cm W x 3.12 cm D.Features DDR4 technology.Weight: 0.0313 lb.Workstation memory module boosts the capabilities of your HP workstation and enhances system performance and responsiveness of applications with low-power and high-speed DDR4 memory.