Listen buddy... Buying more 7950's is not going to solve ANYTHING. If you sold your one 7950, and bought 4 GTX 680's...That would STILL not be enough.
*Facepalm*
And this talk about titan, listen... Titan is not going to push that resolution either. You could go absolutely bonkers and somehow get your hands on 4 Titans, and that would probably not get you anywhere.
At this point, you've wasted thousands of dollars on all this, just so you could play iracing. There is no other game you are going to be able to play fluently, with three of those monitors. Im willing to be that the one 7950 you have right now will struggle with even pushing one of those monitors! The most you are going to be able to do is push one monitor with that piddly little 7950 if you're lucky, and dont even think about doing anything demanding!
Listen to the forum! They know what they are talking about! There is no amount of GPU power available in the world, OR in the making at this time that will be able to push anything other than like, freaking minecraft at those resolutions!
It's your money, but if you want to save what you have still, listen to everyone here. We're telling you this wont work, and not a single person I have seen has said otherwise.