EVGA SSC geforce gtx 960 4 gb gddr5 and a dell xps 8900.....

I just bought this card and its huge. I took the side panel off the computer and fit it up it looks like it might fit.  I dont want to install it now cause I want to upgrade my PSU to a 600 watt. Has anyone had any issues with fitting this card ??? thanks for your time, jeff.

EVGA SSC geforce gtx 960 4 gb gddr5 and a dell xps 8900.....

I7-6700 3.40ghz

16 gb of memory and it has a gtx 745 4 gb ddr3....

im sure someone could help me please?