How big will the graphics jump from PS360 to PS4/720 be?

[fps_d0minat0r]

http://playstationlifestyle.net/2010/12/09/ps3-5-sony-patent-shows-plans-to-increase-ps3s-power-with-external-processor/

a beefy external processor would increase the ps3's power for a lower cost than buying a new system and it would probably be a better GPU than if they released a new system because they save money on all the other parts.

i think it will be more powerful than the gtx590 because by the time its announced and released, even the 590 will be outdated and affordable.