Download and run FurMark. Look at the temps and post the highest temp in an hour run through, if you start to artifact (And your at stock clocks) then its probably the card.
Just making sure, how old is the PSU?
Make sure V-Sync is disabled, and that your running at the same settings. Also check GPU-Z to make sure that your cards are registering crossfire, and right clock speeds. Also make sure that the 'Bus Interface' is at least @x8. If it says @ x4 then its your motherboard supporting really bad crossfire.
Cards are indeed working crossfire and at the right clock speeds. I also checked and its not a power play issue with them downclocking to 2d.
Bus interface - PCI Express 2.0 x 16 @ x8 2.0
My cards actually can reach 99% each. They usually rock pretty hard like that when Im fighting through the jungle in a closer enviroment. Its normally when I reach open areas they plummet BADLY. REAL BAD.
Im honestly thinking of sending them back. $600 is alot of cash for this kind of performance.
I have installed 11.6 CCC and the CAP several times over after using driver sweeper and uninstalling ATI Install Manager express which deletes everything. Driver Sweeper nabs the few remaining files.
Then I reboot and install CCC 11.6 instantly.
I have also tried 11.5.
What can I do? I have tested BOTH cards separately in my first PCI-E slot and they work exactly the same. Aiming at the gas pumps gets me 38 FPS. Shooting them drops it to 32 and rises back up to 35 with the flames and smoke.
When I installed both cards with CF enabled, aiming at the gas pumps brings the FPS to 34 ish. Shooting the pump drops it to 28 and brings it back up to 31.
Your Heaven benchmark results are normal and quite good.
You should check out other benchmarks. Crysis can and does take a lot of resources. 480's in SLI is slightly more powerful, but a lot hotter and noisier. 5870's in CF are also very close to the same.
In a lot of games, not being in the same exact spot does make notable differences are you sure you are close enough to the same location to be considered accurate?
One other issue that plagues Crysis is that it has a memory leak. The longer you play, the slower the game becomes. It's highly advisable to always turn off Aero before you start a session to prologue how long it takes before the memory leak gets you. Having 4GB's of ram is going to make this a big issue for you.
Yes, we were standing in the same spot. Its ONLY when open areas enter my view.
Crysis 2 doesn't drop below 80% usage in the first few areas. But that game is more enclosed.
Metro benchmark had 1 card @ 44 FPS and 2 cards @ 71
Another thing is, the memory leak can't be affecting me because I just boot the game up and run about 10 seconds to the spot. Once I look towards the spot I get the FPS drop. I can turn around and face the mountain and get 90+ FPS. Usage climbs in that situation.