Yes. Every system has a bottleneck. The goal is to minimize it so that you can still play games without over spending. You have a powerful GPU setup, CPU and more then enough ram, so your bottleneck might be in the storage system, or the monitor. I don't think I would have bought two of the eyefinity 6 cards. A set of the 6950s would have been a better buy.
No, he wants to buy them on the $199 each, $179 AR deal. It's a great deal! If you have the cash and a need for graphics, you definitely should pull the trigger on that deal.
And your Phenom II x4 955BE OC'd should be able to handle the both of them. You'll have a well balanced setup that's barely bottlenecked at all.
Beware though--your RAM will only run in dual channel with two sticks. If you move it to four, it will slow down. Most chipsets (X58 included) have trouble with running all the slots filled at fullspeed.
I'd have bought them myself, but I've got a GTX 470 and I'm not sure what I'd do with all these solid graphics cards.
Cheapest 6950 on newegg right now. http://www.newegg.com/Product/Product.aspx?Item=N82E168...
$233 counting shipping and rebate. This is $30ish cheaper then the 5870 per card idea. They will CF better, and perform as a single card better as well. And don't forget they support the newer DP (?) standard so you can still use 6 monitors. Any other questions?
If he'd bought it when I posted, the card was still $199/$179--which was a fantastic deal several hours ago. If he didn't pull the trigger, then he may as well only get a single card now or wait for another crazy deal after the GTX 590 and 6990 are launched.
I'm starting to wonder. Would two 5870s in CF give you six monitors? I know SLI gives you all four DVI outputs which is how they get you 3 screens, but does the same work in CF? I'd still get the 6950s myself, though having to buy DP monitors is going to up the total cost again. Just wondering if anyone has a link for my own education.