Hello!
The GT730 has a Height=2,9cm Length=17,7cm
The optiplex:
Dimensions of full height card inches/centimeters (L x H)
5.75 x 2.75 /
14.61 x 6.99
so L 6,99 H 14,61
The height is fine, but i think the length will be a problem, the videocard is 17,7 cm long, and the case supports up to 14,61.
So no.
The videocard length can be compared to a normal comb.