I've had a DH2G-D and TH2G-D working on a 2007 3G 8Core MacPro (Tiger) with X1900XT last December. Only managed to get 800x600@60Hz on each output.

Last week has 2 x TH2G-D working on a 2007 3G 8Core MacPro (Tiger) with X1900XT. Again managed to get 800x600@60Hz on each output

Had a 2007 2.66G 4Core MacPro (tiger) with 1 x TH2G-D running yesterday with resolutions available up to 1280x1048 on each output

Larger resolutions were not available to be selected in each scenario.

Always test DH2G and TH2G before planning your gig!!!!! not everyone gets the same results!!!!

Simon