I run it at true full screen mode on my 4890 1Gb.
Before the latest patch i could still get it to use the correct clock speeds by renaming the Ubi logo (since it would "confuse" the drivers and it got stuck at 500Mhz if the logo was displayed), but it seems that my fan speed and voltages weren't adjusted along with it and i would get reboots after 10 to 40 minutes of gameplay.
With the latest beta patch i set it to true full screen and everything is fixed, plus i get a smoother frame rate overall as well. I logged the GPU's parameters with GPU-z and even when under 100% load the temperatures are normal, plus it also automatically adjusts the voltage to give steady performance.
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