Half-Life 2: Lost Coast
The tech demo Lost Coast runs on a greatly improved version of the Source engine which is much more demanding than the original game, using HDR and numerous advanced shader-based effects. None of the mainstream graphics cards can deliver a playable frame rate even in 1024x768, although the GeForce 7600 GT almost manages to do so.
Of course there’s no talking about playability when you turn on 4x FSAA. The maximum you can get from a modern mainstream card here is 40fps. Note that the PowerColor X1800 GTO outperforms the GeForce 7600 GT due to its efficient memory subsystem with a 256-bit bus and ring-bus controller.