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So just to clarify if I'm rendering a 4k video then the 4gb card will give no benefit?

My friend is wanting to play games and render (he uses blender if theres any benefit in me saying).

Thanks for the answers but i don't want to know what will work for my screen (i know 2gb is enough) i would like to know will there be any performance boosts while rendering if i buy a 4gb card over a 2 gb card (sorry if thats what you guys are already saying and sorry for not being specific...

Hi there, I'm looking at buying a new rig for a friend who is an animator and video editor and I was wondering whether I should buy a graphics card with 2gb or 4gb vram thinking about getting the r9 270x with a 1920x1080 screen.