Up to 2666 MHz speed with CL19 latency DIMM 4 GB of memory to refine your computer's performance RAM Module is the single answer to all your desired and heavy-duty application memory needs Desktop PC device support for your ram module to allow maximum efficiency and dependability CL19 CAS latency for reliable, fast response and improved performance 288-pin for optimal performance and maximum reliability DIMM form factor with 288-pin and 4 GB memory size effectively lessens the electrical load on the memory controller to allow maximum feasibility 288-pin DDR4 SDRAM interface synchronizes electrical and clock signals for an efficient data transfer rate