Asus 4870 Low Performance?

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Nope nothing shakes, i have 4670 and i play cod4 in 50-60 fps 1680x1050 everything maxed out, AA=2
 
I tried GRID Demo.. Everything seemed to go alright. I maxed out the Graphics at 1680 x 1050, and had my GPU load hit 80%. WIth a GPU Temp Memio of a Hight of 80C.

Anyone tried this demo and could let me know your performance at these settings with a 4870? My card is supposed to me 9% faster then average 4870... so it says..