X51 r2 GPU upgrade gtx660 - gtx 760 sc. case mod and dedicated power supply

So last night I did my research and thought of upgrading my GPU since I always wanted to try it. The cables that came with the separate power supply I bought that is dedicated to the GPU did not fit inside the case so I had to drill a hole in the side of the ventilation to put the cables through and connect it that way. The PSU I bought was a 750. After testing and a bunch of scratches, everything passed with flying color, currently running the 760 sc from a gtx 660 OEM. Any thoughts or ideas or inputs are welcome. Will upload pictures tomorrow.