Yes.

Fullscreen 15-28fps

Pseudo 35-50fps

One of the devs mentioned today that fullscreen should be tried to make crossfire work (and the OP post confirms this). Also NV promised them to make a profile for CloD but did not give any ETA of cause.

You may have worse performance in fullscreen because vsynk works only in fullscreen IIRC.

Try disabling vsynk both in game AND in drivers. If it helps consider enabling triple buffering if you need vsynk.

Same may be the case with FSAA. Try disabling it for a test.

Check that your Windows powersaving options are disabled completely and nothing runs in background (try Gamebooster). My defrag software somehow did not recognized CloD as a running application in fullscreen and started to defrag before it was disabled by Gamebooster. Same can happen with indexing services, autoupdates, etc.

Did everything you said (no gamebooster) and started getting 40-60fps smooth as a babies bum.

Next flight 15-25 fps :| I always get this.

I was having the same issues as you With my ATi 5970 Krupi...Have always had to run in Pseudo mode for acceptable playability (and in Full screen mode I got that awful degradation of performance from one mission to the next as you mentioned). Like some others, this beta patch gave me worse performance (and I tried full screen again for the xfire with the dual GPUs which was even worse).

I have finally given up on the whole Dual GPU/xfire and today bought a 3 gig nvidia 580.

Despite the poorer performance on my 5970, the beta patch (which I think is fantastic overall) confirmed my opinion that the game is heading in the right direction, so I don't mind shelling out the cash for a new card. From what I read (and from my own experience with other games) CoD is not the only game that the 5970 fails to be fully utilized with. I will be sticking with single GPU cards for the foreseeable future I think, much less hassle.

Anyway, the 580 performs outstandingly....almost everything on max (at 1920x1200) with smooth gameplay...even Track IR is way smoother now. I was just flying a rooftop level over London with the a lowest FPS of about 35 or so. Unreal. I'm still smiling.

Clouds still chew up the frames but I am quite happy to have changed video cards now, all things considered.

Dude great minds think alike :D I too have been looking at the 580 3GB but I have already spent over £2000 (New/first PC Warthog Joystick and waiting for a Tarmac Aces KG13, YEAH SEE look how big my balls are and clearly how small my brain is ;) ) for this game (maybe one or others I admit) and the 5970 is a bloody bloody good card. So if I were to buy a new card I would wait for the 680 ;).

lol, I think my brain may be even smaller than yours...knowing me I will probably go out and buy a 680 even if it is released next week..I am seriously stupid.;)

The shore now looks amazing, and my f3 key to hear the 109 do a flypast is wearing out!!

LOL I will take your word for it.

I just cleared out my cache and yes my fps jump back up to 60 :( they need to sort the leak out there.

P.S. What is online gaming like in Oz (COD specifically), I have been considering emigrating for the past few months but need to get 1 or 2 more years experience.

Maybe your ATI game profile loads some settings automatically. Performance can not be different from flight to flight without a reason :)