Do you have a Gigabit router?
Is your network going to be all wired with all computers having Gigabit NIC cards and using cat5e or cat6 wire to network them.
If the answer to the above is yes,then there will be a improvement over the 10/100 setup.
The Gateway website shows your computer as having 10/100, but the PCI Gagabit cards are pretty cheap and easy to install.
I have a Gateway GT5622 and I am planning on setting up a home network and using the desktop as a file server/media streamer. I have a realtek ethernet attached to the motherboard. According to the specs on the Gateway website and on the specs for my motherboard it is 10/100, but in my device manager it says gigabit. How can I tell if I have gigabit or not? Would a PCI networking card give me better network performance?