We recently received a drivers for gt200/gt200b chips, if anyone is interesting in getting geforece gtx working in macpro - lets try.
you will need an injector, for example this one - http://netkas.org/?p=107 .
and drivers itself, from evga site - http://www.evga.com/forums/tm.asp?m=100725204
it checks for macpro model (3,1 and 4,1), so if u have 1,1 or 2,1 - use pacifist application to extract kexts from pkg and install them with kexthelper application
you will need an injector, for example this one - http://netkas.org/?p=107 .
and drivers itself, from evga site - http://www.evga.com/forums/tm.asp?m=100725204
it checks for macpro model (3,1 and 4,1), so if u have 1,1 or 2,1 - use pacifist application to extract kexts from pkg and install them with kexthelper application