Add four copper Gigabit ports to a server without consuming multiple expansion slots. The AddOn EXPI9404PTL-AO is a comparable replacement for Intel EXPI9404PTL-class adapters and uses an Intel 82580 chipset with a PCI Express 2.0 x4 host interface. This design is built for environments where port density matters: virtualization hosts, application servers, and systems that need separate links for production, storage, management, or failover. Four open RJ-45 ports keep deployment simple on standard copper infrastructure, while the single-card footprint helps preserve chassis space and reduce complexity. For procurement teams, the value is clear. You get a server-class quad-port adapter with a lifetime warranty, a known Intel chipset, and the kind of interface profile that fits enterprise refresh cycles. It is a practical choice when a lower-port card would force compromises and a more expensive platform change would be unnecessary.