"When asked about this issue our source replied that the current playable 360 games would all have framerate issues due to the fact that they are running on alpha test units. A rough estimate placed these machines at about one-third as powerful as the 360."
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so yea it might help, but we'll have to see when it gets released or the new dev kits are out.
all three would be nice, but ill have to just stick too one for the moment..my ps3
the 1/3 thing you talk about is not xbox 360 but the dev kits game developers have. they are using alpha kits and those are running 1/3 the speed they say, which causes game previews to chug at 60fps.