Are 15'6 displays ready for 4k?

[Retron]

I still don't get it (I'm slower than the average lol).

So.. will games like AC4, Shadow of Mordor..etc run slower on a 4k using gtx980m 4gb than 4k using a gtx980m 8gb? Or will it be approximately the same?

If the game loads more than 4GB of textures it'll be slower, regardless of resolution.