Hyper X HX421C14FB/4 is a 512M x 64-bit (4GB) DDR4-2133 CL14 SDRAM (Synchronous DRAM) 1 Rx 8, memory module, based oneight 512M x 8-bit FBGA components per module. Each module kit supports Intel Extreme Memory Profiles (Intel XMP) 2.0. Each module has been tested to run at DDR4-2133 at a low latency timing of 14-14-14 at 1.2V.