To be clear, does this card have 4 different IEEE MAC address, so can be assigned 4 different IP on 1 (or 4) different subnets? I was just burned on a 2-port model which looks to Windows like only 1 port & the 2 ports act only like "built-in switch". I need this too like 4 x 1 port cards.

It has 4 different MAC addresses. Can be assigned 4 different IP addresses. I use them under Linux driver.

Questions & Answers: StarTech.com 4-Port PCI Express Gigabit Network Adapter Card, Quad-Port PCIe Gigabit NIC

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StarTech.com 4-Port PCI Express Gigabit Network Adapter Card, Quad-Port PCIe Gigabit NIC

This 2000 MB/s bandwidth PCI Express x4 adapter ensures easy connectivity and plug-in form-factor for affordable and reliable Ethernet network
This 2000MB/s bandwidth adapter is ideal for PCs with PCI Express x4 slots, ensuring top level network connectivity for your desktops
Enjoy the super fast Gigabit Ethernet connection by inserting this Gigabit Ethernet card into your computer
This Gigabit Ethernet card guarantees a replacement networking interface to client, server or workstation
With the 10/100/1000Base-T technology get up to 1000Mbps data transfer rate over the twisted pair cable
Supports cost-efficient twisted pair cables for speedy data transfer up to 100 meters
With quad ports on a single card, save valuable expansion slots on your system for other purposes
Gigabit Ethernet Card offers maximum productivity with added dependability