Thanks for the response RoHe! I wound up going to a local computer repair shop that has a stellar reputation in my neighborhood. The owner said the 2GB variant of the 730Geforce DDR5 would run on the 180 watts my machine has and he suggested the Asus brand. This particular one has a large heat sink instead of a fan. He told me to order it and bring it to him when I had it. He said I could get it cheaper than he could! I hope this works!  
My particular Inspiron 3910 has a 180 watt power supply. I bought it to run a flight simulator called Realflight9.5s which is based on an old 9x format. The integrated graphics of the 3910 is incompatible with this program and I need to add a discrete graphics card. Is the 180 watt Power Supply enough to run the one that Dell recommends or does the power supply have to be upgraded as well. Dell is less than declarative in the charts they publish listing which graphics card with which Inspiron. It would be really appreciated if someone could consider the Dell listed card and issue a simple yes or no answer as to whether the 180 watts is enough to run the below listed Dell suggested card. NVIDIA GeForce GT 730 2 GB GDDR5
Graphics Card Addition