The difference is nvidia made all other cards around the 960 performance region EOL, giving those looking in that performance bracket only the one option. Amd shot them selves in the foot a little bit in this area by trying to sandwich it between the 280 & 280x, smaller bus, less vram, slightly slower yet more feature packed 285. They could have had a real winner if they'd given it more vram (not necessarily a larger bus) and killed off their own cards around it.
Of course the simple reply to the 960 from amd would be a 4gb 285, 256bit should be mostly a none issue at the target resolution while providing breathing room for any vram heavy titles.
It's quite an interesting situation, amd could really put the boot in if the 960 ends up well north of £160![]()
personally i find it hard to recommend anything other than a 290 closer we get to £200
so i dont think 4gb versions of smaller cards makes much sense
i do like the 270's, can still play a lot good games with it, but it does need updating with freesync etc ><