Problem with il-2 Sturmovik:cliffS of dover game

[Aty2]

with the game on low with a 9800 GTX + SLI overlocked at 765 mhz, I get on London between 10 and 20 fps, at times 24, the map of the islands I get between 24 and 30 fps

but low, what results you get with the gts 250? in theory the 9800 gtx + is a 250 gts

byer