>>> If it is a model 7.2 or 7.3 everything inside it will be supported. The gfx card too.

>> ...unless it's one of those:
>> http://www.everymac.com/systems/apple/powermac_g5/specs/powermac_g5_1.6.html
>> [...]

> Huh? Isn't the 1.6 GHz model supported?

I was referring to the stock graphics card, which is an Nvidia one. See also:

http://support.apple.com/kb/SP96

The same is true for the other 4 referred models.