Kingston Technology 64GB RAM Kit (4x16GB) 2133MHz DDR4 ECC Reg CL15 DIMM DR x 4 with TS Server Memory (KVR21R15D4K4/64) Efficient and Powerful: DDR4 provides increased performance and bandwidth while decreasing the voltage saving up to 40% in power used 64GB Kit (4x16GB) of 2133MHz DDR4 Memory 240-pin Registered DIMM From the industry leader in PC Memory Backed by a lifetime warranty and free technical support