[c3d]

Peak 3D performance does not matter.

With Tao3D, I keep pushing graphic cards to their limit, on laptops and desktops. This raymarching example http://www.youtube.com/watch?v=GUMqT9W5BG8 runs fine on my Macbook Pro for about 20 seconds. After that, the heat becomes high enough to throttle the system down. And you end up with a very unpleasant "fast/slow/fast/slow/fast/slow" experience as the system tries to cool down its graphic chip.

So you really don't care about PEAK performance. What you care about is sustained performance, and power consumption in that scenario (not just running idle).