3Com gigabit server Network Interface Cards give you a cost-effective way to migrate to Gigabit Ethernet. Get a dramatic throughput boost, advanced server features, and more. These autonegotiating 10/100/1000 Mbps NICs work with your existing Category 5 or Category 5e copper wiring. The part number is 3C996B-T. These cards were pulled from working systems and tested to verify functionality.