actually i have problems with the connection between a Cisco 3750 and P750 server, the Cisco Gbic is X2-10G-SR and the card of the server is 10 Gigabit Ethernet-SR PCI Express Adapter, both uses 850 nm wavelength but i cant see link between the two cards, the physical connection is with a fiber cable with a conector SC in the server and LC (cable adapter) in the switch.