For a portable centric platform that's pretty beastly. I think that would be more like $200. Double the Wii U in terms of GPU and it could handle some PS4/XB1 games on the go. Sure some of the effects may have to be scaled back and the resolution may have to be 960x540, but still.
I meant for a home console. At $150 this is not doable in a handheld.
PowerVR GT7900 or GT7800 (mobile processors) could hit that, but more likely at $199.99.