Confirmed M17x R2 GPU upgrades (beyond 5870m cf and gtx 285m sli)

Just wanted to do a thread with confirmed GPU upgrades on the M17x r2 (i apologize if there is already a thread )

GTX 485m
This discussion post #10

GTX 460m SLI
http://forum.notebookreview.com/alienware-17-m17x/541132-m17x-r2-gtx460m-mod-can-work-3.html

GTX 460m SLI with benchmarks and comparing to 5870m
http://dell.benyouhui.it168.com/thread-1911285-1-1.html

GTX 470M...

Confirmed M17x R2 GPU upgrades (beyond 5870m cf and gtx 285m sli)