TBS 6903 extra power cable


Hi to users of the TBS 6903 in a Linux machine,
I am endeavoring to set up a new Eumetcast receiving station, using Debian 9  and following the Eumetsat Linux installation guide that is delivered to the Info-Channel-1 regularly. (Also available here :-)

First question that comes to mind is do I need to use the separate power cable that comes with the card ?
I've done some googling around and opinions seem to be divided and the User Manual that comes with the card doesn't mention it !
It's easy to connect so not a problem to use but I'm curious to know what problems, if any, to expect, if I don't use it.
Thanks for any comments !

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