Compatible with AMD Ryzen W790 Workstation Motherboards. Product Specification- Memory Type: DDR5 OC R-DIMM (ECC Registered DIMM) Chip: Hynix IC Pin: 288 Pin Memory Capacity:64GB (16GBx4) Speed: 6600MHz (PC5-52800) Latency: CL34 IC Configuration: 2Gx8 Rank: 1Rx8 FOR WORKSTATION MOTHERBOARDS. NOT COMPATIBLE WITH DESKTOP PC AND LAPTOP. Equipped with high quality Hynix IC. Each IC is tested rigorously with auto sorting equipment designed by v-color. With Limited Lifetime Warranty it includes the service and product we could provide on the market.