Installing a Sapphire GPU. are both power plugs needed??

[de704]

Sorry for this beginner question but I recently bought a 7970 card to do GPU mining are both power plugs on the card needed??

I'm asking because I cannot find any trace of the Card in windows 8 even after loading the drivers. I even downloaded the Sapphire TriXX program but it cant find the card.

Thanks

[BlazinBeaches]

yes they are both needed

[de704]

thanks