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Honestly I wouldn't even consider a 90, Either go the extra bit of cash and get a 980 Ti or a 390/X.
Why's that?
I think he meant a 980, not a (3)90.
980's performance just isn't good enough to warrant its £120+ cost on a 390, and anyone willing (and subsequently wanting) to spend close to £400 on a GPU should just save a bit more and get a 980Ti.
I would agree save a lot more than treat yourself