PS3 Frame Rate

Sony is promising 1080p games for the PS3, and touting their "True HD" as an advantage over the 360.

But we've seen that the specs of the two consoles are actually pretty close - neither is significantly better than the other when it comes to CPU or GPU or memory bandwidth.

So what impact will 1080p have on frame rates?  You'll need twice the video bandwidth to render a 1080p game as a 1080i game (since with the 1080i you only have to render half the scene every alternating frame). 

I'm predicting many PS3 games will be 1080i, not 1080p. 

Not that anyone will be able to tell the difference - 1080i looks awesome.