HyperX HX421S13IBK2/8 is a kit of two 512M x 64-bit (4GB) DDR4-2133 CL13 SDRAM (Synchronous DRAM) 1Rx8, memory modules, based on eight 512M x 8-bit DDR4 FBGA components. Total kit capacity is 8GB. Each module kit supports Intel Extreme Memory Profiles (Intel XMP) 2.0. This module has been tested to run at DDR4-2133 at a low latency timing of 13-13-13 at 1.2V.