The TBT5-AI includes a 850W ATX power supply that can supply up to 600W of power to a graphics processing unit (GPU).  The included power supply has several different power connectors that can be used to power the GPU, specifically three 6+2 pin power connectors and one 12VHPWR power connector.  

The number and type of power connections required will vary depending on the specific model of GPU installed. Please consult the documentation provided by the manufacturer of your GPU for the specific type and number of power connections required.