Thanks for the information
I'll try as soon as I get home.
I recommend sticking with the default SysDef MacPro3,1 unless something isn't working. Then, I would try the MacMini6 series (6,1 for the i5 processor and 6,2 for the i7 processor) to see if your problem is corrected. Changing the SysDef for slightly better benchmark scores is more bother than its worth.
some benchmarks:
macmini 6,2 (airplay working)
cinebench:
opengl 35,66
cpu 6,25
geekbench 13366
Mac Pro 3,1 (airplay not working obviously)
cinebench:
opengl 44.66
cpu 7.68
geekbench: 14632