Motherboard memory module type:DDR4; Memory capacity:8 GB; Clock speed (in MHz):2666; CAS latency:19Built to exacting specifications with the finest chips and components available, Transcend DDR4-2666 U-DIMM memory modules undergo rigorous laboratory testing to be fully compatible with Intel Coffee Lake and AMD Ryzen™ processors. Each memory module is rated at 2666MHz to greatly increase data transmission efficiency by higher bandwidth of up to 21GB/s. Operated at a nominal voltage of just 1.2V, Transcendqqq1s DDR4-2666 U-DIMM ensures that both operating temperature and electrical load on the memory controller can be reduced in order to save more energy.Specifications:DRAM ModuleRAM TypeDDR4DIMM TypeU-DIMMFrequency2666CAS LatencyCL19Capacity4 GB/8 GB/16 GB/Rank2Rx8/1Rx8/DRAM1Gx8/512Mx8/Voltage1.2VPCB Height1.23 inchesPin288 pinOperating EnvironmentOperating Temperature0°C (32°F) ~ 85°C (185°F)