I tested it with my router (NETGEAR WNDR 3700 Gigabit/Dual Band N router (A/B/G/N). the NIC only tested at 100Mbps. It is not a Gigabit NIC at all. What also does not make sense is that the WIFI card is not dual band. It only works on th b/G/N (2.4ghz) band. The 5.8 ghz A/N band is much more suitable for media so this is big time mistake on Micro$oft's part.

The add on card they sell for the old 360 is A/B/G/N compatible, go figure what the &@$% they were thinking with the built in wifi card and NIC on the XBOX 360 S.

There is a reason why it only has 100Mbps. There is no DSL service that needs more....

Update

Use 802.11n WiFi. It's faster.

Microsoft and fast reliable networking - now that's a silly idea only dreamed of by fools.

I use Virgin Media cable for my internet - 100Mb - so already the slow network adapter on the x-box can't give me my full internet bandwidth. Wireless is a waste of space unless you can use 5Ghz range.

Microsoft need to wake-up and smell the future, overlooking the fact that in real terms networking speeds are quoted to include both directions - so 100Mb in reality is only 50Mb not taking in to account any deduction for overhead.

Not very good and so not future proof.

Could you add a cat5e Jack