ATI 4870X2 frame rate problems crysis

I just got a new Sapphire 4870x2 and the frame rate when playing crysis is only around 15-20. I'm playing on high settings with no AA 1900x1200 res. I've seen a lot of benchmarks and they all say you should get around 30 fps on very high settings, and i'm getting crap fps on high.
I just switched from a GTX 275, which got 30 fps on high.
I have used driver sweeper and driver cleaner pro to get rid of all nvidia drivers.
I have a quad core 9650 processor,
4 gigs of ram,
700 watt power.

I have the newest drivers from ATI.

Does anyone have any idea why i'm not getting at least close to the fps i've seen on benchmarks for the 4870x2?
Why are my benchmarks so low, compared to all the reviewers benchmarks, and why am i getting worse fps when i just upgraded from a GTX 275 to a ATI 4870X2

There is probably 30% gain in fps lol stupid buy.

He already did, there have been a couple of these threads recently.

All i can tell you is what i get with the inbuilt benchmark.

19x12 4xaa very high i get an average of 30fps.

It sounds like crossfire is not working for you or you are running it in windowed mode more likely.

Make sure catalyst A.I is set to advanced and if in doubt about windowed mode press alt-enter while in game.

I've seen an 3870x2 get those fps on very high, so yes you have a problem... My bet is that CCC is screwing things up.

If I were you, id do a clean install (I do allways when i change cards), format the pc, reinstall windows, update and install fresh drivers.

When the ati drivers are installed veryfy if CCC has crossfire enabled and teake the CCC for the desired quality/performance.

If you still get low fps after this, two things might happen, first is that you are not getting enough power from the PSU to the 4870x2 card, or that you are being bottlenecked by you cpu.
On the first case, change the psu, on the second, overclock the cpu.

Good luck.

driver cleaner - ditch all the nvidia/ati drivers and download a fresh copy from www.ati.com