Power cable of TBS6980

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When will the power cable be necessary for TBS6980 card?
Re: If you don't experience problem then you just don't need to use additional external power with TBS 6980. As primary power source TBS 6980 takes power from the PCI-Express slot and power supply plug on TBS 6980 is just optional and the card works perfectly good even when it's not connected to any external power source. However, under some circumstances like huge power consumption for example in case DiSEqC motor is used or on some motherboards, which PCI-Express slots don't provide enough or good enough power (like introducing noise in it) then using external power could help and that's why there is power supply plug on TBS 6980 for providing additional power in case of troubles with directly connecting the card to
the power supply unit of the computer or some other power source.
The power supply has three connectors for connecting to computer power supply. It doesn’t mean you have to connect all three connectors. You can decide to connect one, two or three connectors. The more connector you connect, the more power you get.