Transcend's JetRam memory modules are manufactured using carefully tested (ETT-grade) brand DRAM chips that have passed Transcend's strict quality controls and testing procedures. The modules offer excellent compatibility and thoroughly tested reliability, making them ideal for PC upgrades at an attractive price. Each memory module is designed to operate at 2666 MHz to maximize data transfer efficiency with a higher bandwidth of up to 21 GB/s. Transcend's DDR4 U-DIMM JetRam memory modules operate at a nominal voltage of just 1.2 V, which helps reduce both the operating temperature and the electrical load on the memory controller. Compared to standard DDR3 modules that operate at 1.5 V, this results in energy savings of up to 40 percent.