QNAP 8GB DDR4 SDRAM Memory Module - 8 GB - DDR4-2666/PC4-21333 DDR4 SDRAM - 2666 MHz - ECC - Registered - 288-pin - DIMM RAM Module offers enhanced memory with maximum productivity No matter how heavy and numerous the applications that you are using, 2666 MHz memory speed with registered signal will run them smoothly 8 GB of memory to heighten your computer's performance 288-pin DDR4-2666/PC4-21333 interface synchronizes electrical and clock signals for an efficient data transfer rate 288-pin for faster, dependable performance and better access to data and information DIMM form factor with 288-pin and 8 GB memory size effectively reduces minimizes the load on the server memory BUS to ensure maximum productivity Registered signal processing provides increased processing power to allow maximum productivity