DesktopBSD is just FreeBSD with a bunch of custom ports pre-installed. You can "install" DesktopBSD via the ports tree on a regular FreeBSD install.
PC-BSD is just FreeBSD with a GUI pre-configured, and a custom application installer that uses binary packages (.pbi) instead of the ports tree. They also customise the base install a bit, but it's still FreeBSD.
However, which version of FreeBSD is installed by DesktopBSD and PC-BSD is different. And which version of FreeBSD includes support for your specific Realtek chipset is the important question.
What's the output of uname -a on your system?
You need to be running FreeBSD 7.1 to have support for that chipset.
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