i just got a 980gtx +

[Nathan Jackson]

why is there a 6 pin and a 8 pin power connector and not the same like 6x2 or 8x2 and what size power supply should i get

 

[Gam3r01]

Because each connector delivers different wattage. Two 6 pins would not be enough, and two 8 pins is more than the card would need.
The 980 draws about 190w at load, so given other components in the system a quality 500w+ unit would be fine.

 

[MarkW]

When you install the 980, use a twin 8 pin cable, and leave 2 pins unused on the 6 pin plug. They were designed to work this way, which is why 2 pins are just next to the other 6, and not solidly attached to the 6 pin part.

I generally suggest 600w or 650w for a video card like the 980. I believe most companies suggest a 550w power supply minimum, but you really do not want to be running your power supply at 100% load when gaming. Power supplies function best when running at 50% to 60% loads.

 

[Deleted member 217926]

You got a 9800GTX + or a GTX 980? There is a world of difference.

A 6 pin PCI-E connector supplies 75 watts. An 8 pin PCI-E connector supplies 150 watts.