Since there's been a lot of talk about the 5k 27 inch iMac and the gpu requirements to run that kind of display efficiently, I was curious what is needed to run scaled 4k on the 21.5 inch the same. For instance, would you need at least 2gb of video ram? Would the increase in gpu be enough to increase the overall price? Would intels integrated graphics at the end of the year or next year possibly be able to handle that kind of load without getting laggy? Just curious, never been very savvy on GPU stuff.