I did the 3d mark here is my page
I have no idea if this is goodhttp://3dmark.com/3dm11/2304124
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.