I know this is a bit early, but it seems that the 9650 that's going into the dual 2.7 is essentially a radeon 9600XT with DDL DVI instead of ADC, and a different TDMS(?) on that side to handle the DDVI port.
In that case, might this card be able to work like the 9600XT and 9600pro in G4s? That'd be incredibly funny, but I suppose the verdict is still out until someone can compare a 9600XT to a 9650, or even go as far as confirming my speculation by actually sticking it in a g4 (with tape mod of course), and giving it a shot!