Qnap RAM-4GDR4A1-UD-24 RAM Module, Memory 4 GB, DDR4 SDRAM, Speed 2400 MHz, DDR4-2400/PC4-19200, Unbuffered, Number of Pins-288, Form Factor DIMM. Boost your storage system's capabilities with the 4GB DDR4 2400 MHz UDIMM Memory Module from QNAP. Delivering speeds up to 2400 MHz, this module is a memory upgrade designed to improve your system's overall responsiveness.