Alienware Area-51 ALX
Intel Core i7 980x Extreme Six Core Processor (3.33ghz 12mb Cache) Not OC'd
6GB DDR3 1866mhz (3x 2GB) Kingston HyperX Tri-Channel Memory
Dual 2GB GDDR5 ATI Radeon HD 5970's CrossfireX Enabled
Windows 7: Home Premium
x2 256 Samsung SSD's
Creative Soundblaster X-Fi Titanium
21.5" Alienware AW2210 OptX Full HD Gaming Monitor
Alienware TactX Mouse & Keyboard
Astro A40 headset or Logitech 5.1 Surround Sound
________________________
Aside from my specs, I have the opportunity to replace the 5970's with two 2GB GDDR5 ATI Radeon HD 6950's (which can possibly be bios flashed into 6970's with a bit of risk), free. I don't know what I want to do; the 5970's are still more powerful than anything ATI has (atleast until the 6990's), however they are much older and less powerful than alot of newer cards for DX11 (tesselation-wise).
Should I take the 6950's or should I keep my 5970's; Pros + Cons would be nice. That is, if you know what you're talking about.

To be very honest, stay as you are for a while. Those 5900 cards are prob held back with youre CPU (need to OC youre chip man).
Saw 5900 in cross fire getting just 83% load on benchmarks on an i7 920 at 4.0Ghz with my own eyes (not some online junkie saying so).