If I have 3 computers running 12 ps3 cams do all the computers need a Bluetooth adaptor for the move controller tracking?
Also, can I i use 3 computers GPU (link the GPUs together) at the same time?

Hi
The number of Bluetooth adapters needed depends on the number of PS Moves used. Usually one Bluetooth adapter can handle up to 4 PS Moves. So if you track one actor then one Bluetooth adapter is sufficient. If you track two actors with 3 PS Moves per each then it's probably the best option to split them between 2 BT adapters connected to different PCs.
You can utilize for tracking multiple GPUs in the same PC. But distributed tracking with several PCs is not supported.