SMC EZ Card 1000 (SMC9452TX V.2): With the SMC9452TX 32-bit Gigabit PC Card, network traffic slowdowns will be a thing of the past. With speeds 10 times faster than Fast Ethernet, the SMC9452TX operates at 1000 Mbps using existing Category 5 networking cables and boosts your connection speed with 2000 Mbps of dedicated full-duplex bandwidth over copper wiring. The SMC9452TX also uses auto-negotiation to ensure backward-compatibility with Ethernet and Fast Ethernet standards. The SMC9452TX is plug-and-play compatible and works with Category 5e and above Ethernet cables.High throughput is delivered with minimal CPU utilization thanks to features such as TCP and UDP checksum, flow control, and jumbo frame support.This is the card you need for a 32 bit server or Desktop using Cat 5 or Cat 6 cabling is recommended for Gigabit Ethernet Copper.