I have GTX 560 Ti which requires 2x6 Pin. I dunno if I'm missing something here but my eyes can only see 1 1x6 Pin and 1x4 Pin in power supply. Does that mean I need to upgrade my PSU?or I need to look more careful where to find the other one 1x6 Pin since 550w suppose to have 2x 1x6 PCI pin?