The only OpenGL title in the benchmark array checks how well the graphics cards can deal with games based on the Doom 3 Engine. The requirements are relatively low and so even slow cards reach playable framerates.
I can't see any reason of getting 9400 GT (unless where you buy has weird pricing). You can get 9500 GT for the same price (even with 20$ rebate). And even better just invest another 15$ and get yourself 4670 or 9600GT.
But even with 9500GT you can run COD5 fine on Max up to 1280 resolution.
i wana play call of duty 5 with good detailes.. which of card do u suggest 9400 gt of ati hd 3650 ??
Both cards won't run the game properly with settings higher than low or possibly medium. If you want to play Call of Duty 5 with medium or high details you will need a better graphics card.