Kotaku - Sources: Sony Is Working On A ‘PS4.5’

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shikamaru317 said:

teigaga said:
So no one knows whether its likely possible to upgrade the PS4's performance externally through an add on?

I don't think it's possible. The fastest port on the PS4 is USB 3.0 afaik, which has a 5 Gbit/s transfer speed. Most external GPU upgrades use a Thunderbolt connection, which is 10 Gbit/s, twice the speed of USB 3.0. And like I said, that's just a GPU upgrade, I'd assume that you'd need a CPU upgrade. In fact, I'm not even sure if Thunderbolt's 10 Gbit/s is fast enough to be reliable, you might need the 20 Gbit/s transfer speed of Thunderbolt 2. 

Yeah I think it would have to be a new hardware model, but I guess that one could be upgradable.