The GTX 750 ti = 60w, so you might get away with it.  I don't know that it was necessary to remove DVD drive as a slim DVD drive doesn't take hardly any power. Also, I have to mention it's outside of Dell specs, however, there are Optiplex 9010 SFF GTX 750 ti videos and others.
I have a graphics card Gigabyte GV-N75TOC-2GI (GTX 750 Ti OC), I don't know if the dell optiplex 9010 SFF psu can run the video card or not? The link of     graphics card: [URL]#ov[IMAGE]
Can a psu ( 240W ) in dell optiplex 9010 sff will be enough to run gtx 750 ti 
oc?