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The Lenovo 7ZT7A00536 is a four-port Gigabit Ethernet PCIe adapter built on Intel silicon, sold as a ThinkSystem server option. It gives a server four RJ-45 copper ports at 10/100/1000 Mb/s over a PCI Express 2.1 x4 host interface. That suits virtualization hosts, firewall and routing builds, and NAS boxes that need several copper links from one slot. Against single-port server NICs it saves slots; against 10GbE adapters it trades throughput for cheap copper cabling and broad switch compatibility. It is an OEM part, so check your server's option compatibility list before buying.
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Buyers of this class of Intel-based quad-port adapter generally report stable links and easy driver setup on Linux and Windows Server. Complaints center on it being Gigabit-only and on OEM compatibility checks.
This is a quad-port Gigabit Ethernet network adapter for servers, made by Intel for Lenovo. It has four RJ-45 ports and supports 10Base-T, 100Base-TX and 1000Base-T connections at up to 1 Gb/s.
The adapter connects to the server through a PCI Express 2.1 x4 interface.