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A network card with a mezzanine connector is an expansion card for computers that has a special slot called a mezzanine connector. Mezzanine slots are typically smaller than traditional PCI Express or PCI slots and are typically used for specialized expansion cards used in specific applications such as servers, blade systems, and other high-performance computing.

Network cards with a mezzanine connector usually offer higher bandwidth and faster data transfer rates than traditional network cards because they can access the motherboard bus directly. They also typically take up less space in the system case because they are smaller than traditional expansion cards.

There are different types of mezzanine connectors used by different manufacturers including PCI Mezzanine Card (PMC), Advanced Mezzanine Card (AMC), and Enhanced Small Form Factor Pluggable (SFP+). The choice of connector type depends on the specific application and system requirements.