ADATA XPG Z1 DDR4 2133MHz (PC4 17000) 16GB (8GBx2) Memory Modules, Red (AX4U2133W8G15-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.