Hyper X HX421S14IBK4/16 is a kit of four 512M x 64-bit (4GB) DDR4-2133 CL14 SDRAM (Synchronous DRAM) 1 Rx 8, memory modules, based on eight 512M x 8-bit DDR4 FBGA components. Total kit capacity is 16GB. 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 14-14-14 at 1.2V.