Need help about GPU GTX 770 Windforce About it sockets

i just bought 4gb gigabyte gtx 770 windforce

i notice it has 8 socket on left and 8 socket on Right

http://i.imgur.com/3RGQJo7.jpg

Do i need to plug all the socket?? …

on my power supply i have 6+2 and another 6+2 do i need to plug left and right to make it 16 or just 8??

and also i need help how do i return all my Power Supply Cords back to normal to its mother board i bought a new CPU case because the VGA is too large for my old CPU

and
also a new powersupply 700watts because vga minimum is 600watt

now all my cord is scattered detach

my friend suggest is to go manual of mother board of ASUS but how do i find my model of asus motherboard model i lost its manual a long time ago

im sorry if i ask a lot of question

You will need to plug in both sockets with 8 in both.