benchies look impressive but the hard thing to swallow is if they are real
IF it hits rated clock speeds, everyone on earth thinks the 380gtx will be faster than a 5870 without question(well, at least in DX10), we also assume the card will be £400 or more, card thats twice the price of a 5850 but can't offer twice the speed and won't be remotely available and won't launch for another 4 months?
THe only question is if Nvidia can't hit their targeted clock speeds it could be quite a bit slower than they hoped, a lot closer to a 5870, and not hitting their clock speeds DOESN'T change how much it costs them to make. Meaning it would still have to cost £400 and be even worse value than its going to be.
Frankly those numbers are made up, we have no idea how it will do in various games, but I won't be remotely surprised by a few titles showing a ridiculous advantage, just like there are several titles where the 5870 is way faster than a 280gtx and others where its not so far ahead.
Remember that, the first benchies that get leaked that are real will be without question in Nvidia's strongest games performance wise, not their weakest. Because of the advantage various games have it could be twice as fast as a 5970 in one game, and half the speed of a 5870 in another game.
Overall performance is what we need to know and really, DX11 performance is one of the biggest questions right now.
You just don't need a 380gtx, or them in SLI to play any game now at 1920x1200, if you aren't buying it to make sure newer games in the next year can all continue to be maxed out well, its for epeen, those are really the only two options, I have no issue with the first, but DX11 performance will be key to those people.