Where do i plug in 6 pin cable?

HelpPlz

Honorable
Dec 31, 2012
2
0
10,510
Hello,
I got a new radeon hd 7770 graphics card, but I have not idea where to put the 6 pin cable at. I see the 6 pin side goes into the graphics card, but I don't know where the other side goes (it has three pins and a hole). Pics or vids would be nice.