Originally Posted by Melvis
So iam correct sorry, the 6870 which took the place of the 5870 was infact a weaker card regardless of the 6950 or 6970, if you want to put those cards against there equivalent from the last gen, that be the 5970 and we both know the answer to that question lol
Actually, after the naming change the 6870 was primarily intended to replace the 5770, not the 5870. The 6870's performance is somewhere between the 5850 and 5870 at stock speeds, but it isn't what it was targeted to replace. I'm not sure where you get your information from, but you might want to double check your sources.
The naming shift worked like this and there actually were vast improvements over 5xxx series, including shader speed and efficiency, faster memory, and better crossfire scaling and honestly going from the 6000-series to 7000-series did the same kind of improvements, but didn't have the same amount of improvement.
5750 -> 6850
5770 -> 6870
5850 -> 6950
5870 -> 6970