I have a Dell Optiplex 745 (the slim one) and was thinking of upgrading the video card. I was interested in something like the GeForce GTX 660 Ti, but because I have a slim case, this may not be feasible. I looked around for slim cards but they appear to be very underpowered compared to normal cards.
I have heard about risers and extension cables, but I don't know much about them. I am open to modifying my case if need be or even buying a new one, but I would like to get some advice regarding my options.