The guys at PureOverclock have posted their take on ATi & the physics acceleration scenario they've brought to the table. All I know is that if someone can bust out a mobo with three PCIe x16 lanes, I don't think anyone would be complaining...

"ATI appear to mean business with their offering for physics acceleration and are strutting around rather confidently claiming they will hold a major performance advantage over the competition. If it does turn out to have a performance edge over Nvidia and AGEIA it will surely boost CrossFire sales."