Only under very limited situations would the extra Vram be any use, for 1080p gaming 2 gig is about the maximum memory the engine could run well.
I would not buy a 4 gig 270x.
4 gig 380, that is worth the difference.
the situation here is between 270x and 270. my budget is kinda tight. Plus the equivalent price of the asus 270x 4gb is powercolor devil 270x 2gb. Or should i go for the powercolor?