Do i need all pins in my Sapphire Vapor-X R9 290?

[Urmomfails]

My psu provides me with a 6+2 and a 6 pin, but my graphics card has 2 8 pin slots. do those last 2 pins need to be filled in?

EVGA 850W G2

 

[getochkn]

Yes. They are not optional. They are there for a reason......

 

[Urmomfails]

So...do i get a new graphics card power cable? or get a new PSU....

 

[Urmomfails]

http://www.evga.com/products/images/gallery/100-CK-1300-B9_XL_4.jpg The wire looks like this...