GX2s are too damn powerhungry IMO
Being a former GX2 owner I should know!
Even though a 9800GX2 made 47FPS on 2500x1600 on med in crysis, Im not going near em with a barge pole.. Two 8800GTX in SLI performed slightly less better and the 3870GX2 was thoroughly trounced in HD/UHD ...tsk tsk ATI..
Conclusion: expensive to buy, expensive to run, but is currently the fastest hunk o junk in the galaxy.
the benchies are always at G3D of course