I don't think you'll see any performance difference

If you think about it, you're on a 100 Mbps LAN. Your typical Cable/DSL provider gives you between 256Kbps and 1.536Mbps tp toy with. You're already roughly 66X faster than that. Have you ever played gamed over a cable connection? Even the snazziest of games can't put more than 350Kbps to use at any given time. So, you've got enough theoretical bandwidth to allow nearly 300 gamers play at the max nessesary bandwidth. Even if the hub drops efficiency down to 10%, you will still have enough bandwidth for twice as many gamers as you will have ports. The only possible bottleneck that I can see is the single NIC going from the game server to the rest of the network. (You are going to be running a stand alone server, no?.) So as long as the main server is hooked to the switch you should have fun. Ohh, BTW, does the uplink port use up one of your open ports? Seems like you might have a max gamer capacity of 14 players. (8+8-1[uplink]-1[server]=14) Still, a 14 person LAN party would ROCK!

In that case I'd worry more about the chips, dip, and beverage than worry about the available bandwidth.

(P.S. expect pings of no more than 10 )