ADATA XPG Z1 16GB (2 x 8GB) 288-Pin DDR4 SDRAM DDR4 2800 (PC4 22400) Desktop Memory Model AX4U2800W8G17-DRZ Amazing Performance with Great Power Efficiency. XPG Z1 features excellent cooling and stable data transfer due to Thermal Conductive Technology and 10-layer PCBs with 2oz of copper to effectively reduce electric resistance and consume less power, which greatly enhances the quality of signal transfer. XPG Z1 DDR4 DRAM Module is made of high-quality chips selected through a strict filtering process. It also uses the top quality PCBs (Printed Circuit Board) that effectively extend the lifespan of memory modules.