Are you gaming? You don't get Tesla or something like that. This is for professional graphics when you do things like 3Ds Max, Folding at Home, etc. The gaming performance of Tesla cards are not much faster than something like 560 ti or maybe even 460. So at gaming you go better totally with a 7990. Because if you get Tesla, you will totally waste your money if you are gaming. However if you want to do professional jobs as I said before, you'd better go with Tesla, because it's designed for that. Which means, it depends on your needs because these cards are designed for different purposes. Good luck on your purchase
and have a good day.