The latest beta patch (April 27th) did it for me, in conjunction with the 11.4 drivers. Now i have true full-screen mode and the GPU increases clock speed on its own.
Longer load times and still not very high FPS but much smoother, ie less FPS fluctuations and stutters. I could get up to almost 60 with the GPU clock constantly at maximum factory settings with the previous beta patch, with this one and no forced clocks it just manages it on its own. I get dips into the low 20s occasionally but overall it runs smooth.
My PC is not too shabby neither cutting edge: i7 920 @ 2.7 Ghz, Ati 4890 1GB and only 3GB of RAM.
I run models, effects and land shadows on high, building detail on low, the rest on medium, Vsync on, grass, roads and shadows on, SSAO off on a 1680x1050 resolution.
Not bad at all i'd say, considering that my RAM usage is hovering around maximum all the time. If i do end up upgrading anything that will be it, another 3GB of triple channel RAM should do the trick.
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