Motion is designed for video editors, Motion 5 lets you customize Final Cut Pro titles, transitions, and effects. Or create your own dazzling animations in 2D or 3D space, with real-time feedback as you work.
Verify which model of the Mac Pro you own. If you own the 1,1 or 2,1 Mac Pro your options are limited to a few GPUs: • Nvidia GT 120 • Nvidia 8800 GT • AMD Radeon 7950, 7970 or R9 280X if you have installed OS X Mavericks or newer via hack methods. We do not provide these methods, but information about them is readily available online. If you own the 3,1, 4,1, or 5,1 Mac Pro you can utilize any of GPUs we sell except for the GT 120 and 8800 GT mentioned above. Please be aware that while the 3,1 Mac Pro has the same GPU compatibility as the 4,1 or 5,1 that the older hardware of the 3,1 will result in some comparative bottlenecking. In general I recommend the GTX 770 as the high end for the 3,1 Mac Pro as it maintains its price/performance ratio.
If you prefer the ports or other features of a more powerful card it may still be worth considering.