Not really:
http://forum.beyond3d.com/showthread.php?t=62108
>Usable memory amount is very much tied to available memory bandwidth. More bandwidth allows the games to access more memory. So it's kind of counterintuitive to swap faster smaller memory to a slower larger one. More available memory means that I want to access more memory, but in reality the slower bandwidth allows me to access less. So the percentage of accessible memory drops radically.
In this case, if the 360 is really at 60 GB/s and the PS3 200+, that's a much larger disparity than the current generation.
Bandwidth of storage is abysmal by comparison.