Ellsa is another of my biggish servers, and I knew that there was a spare PCI slot, so I decided to upgrade ellsa to gigabit ethernet.
Ellsa is running Fedora 17; although that's pretty old, it's not as ancient as some that I'm running (I started using Red Hat long before Fedora 1 came out). So, rather than install the latest Fedora, I decided to just stick the card in and work out how to install it.
I put in the card, plugged in an ethernet cable and powered up.
It worked. I didn't need to do a thing, and now ellsa has gigabit ethernet.
That's the way to do it!
Since I'm clearly moving to gigabit ethernet all over, I've ordered another 8-port switch, and a 16 port switch. Plus three more gigabit cards, and a couple of USB-to-gigabit converters, for those boxes that don't have spare PCI slots.