Hyper X HX421C14FB4 is a 512M x 64-bit (4GB) DDR4-2133 CL14 SDRAM (Synchronous DRAM) 1 Rx 8 memory module based on eight 512M x 8-bit FBGA components per module Each module kit supports Intel Extreme Memory Profiles (Intel XMP) 20 Each module has been tested to run at DDR4-2133 at a low latency timing of 14-14-14 at 12V Memory Size 4GB (1 x 4GB) Memory Type DDR4 Module Type DIMM Memory Speed DDR4-2133 M Hz Pin Configuration 288-Pin Registered Unbuffered Unbuffered Error Correction Non-ECC CL-t RCD-t RP-t RAS CL14-14-14 12V Heat Sink Yes (Black) Working Voltage 12V