I have been working with the technical support folks at Dell for the past few days. They have not been any help at all and after the first call have not been really interested in pursuing the matter. What a joke.
Tonight I removed the GT720 and started using the on-board graphics chip. Aces High tells me it's an Intel HD Graphics 4600. Videomem is 1792. The frame rate is now stable at 60 - in tower, in MA, in a custom arena, in a furball. I then set the Max texture Size back to 1024, checked bump map terrain and bump map clouds to go along with detailed water and detailed terrain. And the frame rate is still stable at 60.
You gentlemen were correct from the gitgo. My skepticism was unfounded. That GT720 card is crap.
I've gone back to Dell looking for some concessions.
Thanks to all for the help, advice, and patience.
<S>