GPU requirement for 4k in 21.5 model?

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since there's been lot of talk 5k 27 inch imac , gpu requirements run kind of display efficiently, curious needed run scaled 4k on 21.5 inch same. instance, need @ least 2gb of video ram? increase in gpu enough increase overall price? intels integrated graphics @ end of year or next year possibly able handle kind of load without getting laggy?

curious, never been savvy on gpu stuff.
 

the 13" rmbp runs 4k external screens @ 52hz without dgpu.
 


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