 "Crucial - DDR4 4 GB DIMM 288-pin" " Crucial 288-pin CT4G4RFS8213 Server Memory CDW.com
"More speed. More bandwidth. More efficient. Next generation DDR4 memory is here.Overcome one of your greatest server limitations: memory. From networking, cloud computing, and virtualization to HPC, Big Data and more, memory - dependent server applications require increasingly higher densities of memory and higher levels of performance than are attainable on current DDR3 technology. Enter Crucial DDR4 server memory.This product is a 4GB DDR4 server module that operates at speeds up to 2133 MT/s and has a CL15 latency. It is a Registerred DIMM (RDIMM) with Error Correction Code (ECC). It conforms to the industry standard DDR4 RDIMM layout of 288 pins and is compatible with systems that take DDR4 2133MT/s RDIMM memory." 
 "Samsung - DDR4 8 GB DIMM 288-pin" " Samsung 288-pin M393A1G40DB0-CPB System Memory (RAM) CDW.com
"Samsung DDR4 is an optimized solution for highly virtualized environments, high-performance computing and networking.Achieving bandwidth speeds up to 3.2Gbps, Samsung DDR4 delivers higher performance at a higher speed than both DDR2 and DDR3. Compared to DDR3L (low power DDR3), Samsung DDR4 shows an overall improvement in performance in every DIMM and a performance that is more than 40 percent better at 1 DIMM per channel.A major decrease in voltage and the improved I/O power efficiency of DDR4 synchronous dynamic RAM (SDRAM) translates into significant cost savings. According to Samsung internal testing, DDR4 boasts a continuous working voltage of 1.2 V, a voltage that is 11 percent lower than the 1.35 V consumed by DDR3L. By adopting POD (Pseudo Open Drain) for data transmission, Samsung DDR4's input/output (I/O) power consumption is reduced by 50 percent compared to the previously-used SSTL (Stub Series Terminated Logic) of DDR3L. Overall, Samsung DDR4 shows a Performance/watt level more than 20 percent higher than DDR3L." 