@ScottNJ:
I'm not so sure about that. I built a Pentium 4 PC back in '04, the MSI motherboard came with an onboard Realtek Gigabit NIC.
I had lots of problems getting it to work at 1000mb. I tried various driver versions and tried 3 different branded gigabit switches.
I gave up and stuck an INTEL card in the box. Cleared up everything.
There's a difference between a 6 year old chip (and 6 year old drivers, too) than what is coming out new today.
Given a choice, Intel is generally better, but they have their fair share of issues too for some. A search on the freebsd-stable list turns up plenty of problems (checksum issues, tso issues, vlan hardware tagging issues, altq broken in 8.0-release, etc, etc)