Hi I bought a Diamond 5970 from newegg over thanksgiving, and I installed it into my computer, everything works. However, I believe that i'm not using all the video cards I have. My FPS in skyrim has gone down, and I installed GPU-Z and it said 1 was enabled 3 video cards and the rest were disabled. My second video card is a 5870 I believe diamond also (2gb) edition.
in there it said I can Crossfire them 5970 and 5870 am I missing something?
You can, but you won't see improvement with Skyrim.
As it stands, only the lastest beta drivers will allow for crossfire in Skyrim. CCC 11.11c if I'm not mistaken.
Also, Skyrim's performance is heavily dependent on your CPU, rather than the GPU. With that much horsepower, you won't likely see an improvement even with the beta drivers, unless you use eyefinity or something super high res.
With the system in my signature, with a single 6970 a little overclocked, I would about 5k. With 2 of them, I would get 9.5k.
Your 5870 is clearly getting some boost from crossfire. I'm unsure if you are gaining trifire benefits by that score, as I don't know what 5870's normally get in crossfire, but the full read out clearly recognizes you running in crossfireX with 3 GPU's.
Edit: with further examination, I'm certain it's working as your Graphics score is at 108xx. With two overclocked 6970's, I saw about 10k even.