A high end PC with 'only' a measly 3GB in a 780, or even 4GB in a 970, is still going to perform significantly better tha a PS4 version. Even if you can't use ultra textures (which I honesly can't believe are going to be that useful for 1080p, maybe for 4k), the textures are probably still higher res or at worst on par with console. And it'll have higher framerate, and probably higher resolution shadows, better AO etc.
I do think GPU manufacturers will need to start offering 6-8GB options at or close to launch. Yes there will be a premium but hopefully GDDR5 will come down in price and anyway give purchasers a choice.
I do think GPU manufacturers will need to start offering 6-8GB options at or close to launch. Yes there will be a premium but hopefully GDDR5 will come down in price and anyway give purchasers a choice.