I have 3 nvidia gtx 285's and when I use all 3 with the evga sli enhancement patch, it works fine. On Extreme 1920x1200 I shoot up to 180fps and sometimes down to 40 while outside in the action packed city.
Monitoring my gpu temps and usage, it shows only 2 cards are being used out of the three.
If i go to the nvidia control panel and dedicate one card to physx and 2 to SLi, I get the same flickering Issue. 266.58 drivers.

Looks like having 3 way SLi is the only fix for now.

Yes. It doesn't fix the flicker issue.

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Current workarounds for ATI users:

1. Disable Crossfire (check the "Disable Catalyst A.I." in the CCC)

2. Manually create a new profile for Crysis2 using RadeonPro.

3. If not using the Steam version, rename "Crysis2.exe" to match one of the existing Crossfire profiles (e.g. "Rift.exe", "Bioshock.exe").

I had insane flickering with or without 5970 crossfire enabled. The problem was solved by not downloading the update. From what I understand, you will need the update to play multiplayer. Hopefully, Crytek and EA will have a patch to fix this very soon.

FINALLY FIXED THIS FOR ME...

Corsair 1200 PSU
Asus Rampage 3 Extreme
Sli GTX580
i7 920 @ 3,6
12GB @ 1600 Corsair
3x Dell 23" nvidia surround.
Win 7 x64

I tried all the nvidia Beta drivers even the leaked 270 ones. Massive flickering. No matter if using EVGA Sli Profiles or nvidias profile fixes. and manually setting the AFR2 etc, etc... disable fullscreen etc, etc everybody suggested here and in the Steam forums.

I have now rolled back to 263.09 and the flicker was gone, but no good Sli. one gpu took the most work and the other only at 14%.
Added the EVGA Sli Enhancement profiles and now both gpu's working and NO flicker (and NO headache and bleeding eyes :)
Finally ready to start the campaign in 6000*1080 Surround! Have about 50 FPS and seems smooth so far (couple of minutes in to the campaign)

Now only have to wait for proper new drivers etc and maybe patch for Crysis!
Could probably try to tweak some but im happy for now and eager to start the single player campaign!

http://www.youtube.com/watch?v=GuCkh9CL5tM

Uploaded a video using my phone's camera showing the issue, since recording it in Fraps didn't display the issue.
This needs to be fixed. I don't even want to touch this game until it is, it's so unbearable!

How do you not download the update?
You can't launch the game without the update.

yes, I tried the 11.2 CAP4 profile and it reduced fps for me. I unistalled it and now i am getting between 75-100 fps on the very highest settings.. I am using two 5970's in crossfire x. I sent AMD driver feedback. Anyways, I would try both with it and without to see what it does for you.

Okay, looking at that ATI guy's video, my flickering is definitely not as bad as that. Where his is flickering all the bloom and light, mine only seems to have shadowed areas flickering. Like boxes and walls that are shaded will flicker to full-bright and back off again. Not quite the same as the flicker in your video.

My flickering is different from the video posted. Its just blacks out portions of the screen for a second or two. If i look left the flickering changes and If i look up or down the flickering changes again. It flickers like the youtube video posted, but its black.

I'm posting a quick video of the flickering on my Nvidia set up. I've tried all the lastest drivers and SLI patches in various combos. It always looks like this in game. (dont mind the FPS, zdnet video cap program killed my FPS a bit) You can see the flicker I'm talking about though even with the bad FPS.

http://www.youtube.com/watch?v=DjpN5HoX8xA

some system info https://docs.google.com/document/pub?id ... 0pLXuzozgw