Well... it is a little unnecessary, but you have to remember that the "max-frame rate" will only be reached by games that are extremely low-graphics intensive. For the mostpart, the high "max" frame rate will just serve to allow game developers to add more and more detail to their game environments while keeping the gameplay at a decent pace.
This newly raised ceiling really gives us a picture of how powerful the PS3 is going to be and how much innovation and "upgrades" game developers are going to be able to integrate into their new works on the system.
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