Not sure. My rev. 1.1 Xbox seems to work fine on the GbE (of course, at 100Mb). I'm not sure what was changed in the chipset that could cause this. Somebody on xbox-scene should know though. I'm going to double check all my cables and see if I can find one that works, or if I can find a pattern (ie. use new/old CAT cable to see if something in the wiring changed that causes it).