Hi, I want to upgrade the graphics card in my Dell T7610. The PSU connectors available are 6-pin (only 1 into K4000, but spares available). The GTX card has both an 8-pin & 6-pin socket. can i connect x2 6-pins into those or must i use a 6-pin to 8-pin converter cable for the 8 pin connection. I presume using just the 6 pin is not enough. PSU is 1300w (T7610 PSU 09JX5 H1300EF-01). Appreciate any help before i jump, thanks.