IT Parts should be replaced and installed by certified and qualified techs. Please ensure that your original part number matches this exactly, or check with the manufacture for compatibility. Customers are responsible for compatibility. These are all Genuine HP and Dell parts or systems. quick code b1940602 mfr name hp mfr number 766491 b21 10 HP Flex Fabric 536FLB network adapter 766491B21 Ethernet HP Flex Fabric 10Gb 2port 536FLB Adapter (766490B21) part no 766491 b21 hp flex fabric 10gb 2 port 536flb