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Soundwave said:

I have to wonder though if you cut down a game resolution to 960x540 (Vita resolution), that's 1/4th the pixels of 1080P and it's bandwidth of 50GB/sec ... that's more than 1/4th of the PS4's GDDR5 RAM (140GB/sec effective approx). 

You also have to take into consideration of things like fixed function units and GPU features ...