I have never thought of that. What would cause this? Would it not be inbetween crossfiring 2 4850s and 2 4870s? 4870s really seem to be in a price sweet spot at the moment which is why i was taking interest in that over 2 4850s. I live in New Zealand by the way where a 4870 is about NZ$20 (about US$15) more than a 4850 which seems to make buying a 4850 pointless.