Try Colin Mcrae's DiRT. I'm running a E6600 C2D @ 3.4GHz and an overclocked 8800GTS and I get --hold on to your ass-- 1/30th of 1fps on ultra detail. Yeah, you heard me, I had to hit the reset button when I fired it up for the first time, that's how slow it ran. After some tweaking, I'm able to get about 10fps @ 1650x1080 4 multisample pass medium everything except textures/models, no mirrors.
As the game is installing you watch pictures of racing... and I remember thinking... why do these companies show pre-rendered screenshots of gameplay? They're not... it IS the game.. it looks like no game I've ever seen. This is the exact definition of "next gen graphics" when it really should be "not yet here gen graphics" since my top of the line system gets completely annihilated - I remember back in the day when you really threw the cash down you could ultra detail ANY game and not have to worry... now I'm cranking games down to medium detail wondering why I spent the bills.
no, that's not pre-rendered.
As the game is installing you watch pictures of racing... and I remember thinking... why do these companies show pre-rendered screenshots of gameplay? They're not... it IS the game.. it looks like no game I've ever seen. This is the exact definition of "next gen graphics" when it really should be "not yet here gen graphics" since my top of the line system gets completely annihilated - I remember back in the day when you really threw the cash down you could ultra detail ANY game and not have to worry... now I'm cranking games down to medium detail wondering why I spent the bills.

no, that's not pre-rendered.