[citation][nom]nevertell[/nom]Cmartin011, you are clearly missing the point. The network controllers on the motherboard use system's ram and the cpu to manage networking, whilst this has it's own RAM and a special CPU to deal with networking, and because of the drivers, can give certain programms or even connections different priorities, so you won't be bothered by your porn downloads while you are playing call of duty.[/citation]
The traffic prioritization and bandwidth control can certainly be useful in some cases. Having the CPU deal with networking isn't a problem these days however - most games don't even use four cores, so you have one or two full, 3GHz cores doing nothing anyway. Maybe it's useful if you still game on a Pentium III with 256MB RAM...