In that respect, I think it's safe to assume that since Barts is the third chip in the row, from top to bottom, as well as a Juniper succesor, we should not expect some crazy performance. I mean at least not *much* higher than the 5870 so to be worthy of the 68XX name.
Barts XT as HD 6830 sounds very good, also it could match the rumors that Barts XT is around 2/3 of Cayman XT, like HD 5830 was ~2/3 of HD 5870 performance-wise.Barts Pro: HD6810
Barts XT: HD6830
Cayman Pro: HD6850
Cayman XT: HD6870
The 6830 would be the logical successor of the 5830. The 6810 get its own new spot in the hierarchy.
If Barts performance is around or slightly higher than Cypress, then it should be 67xx series. Juniper was about as or slightly faster than 4870.
No no no, don't you see, according to many here...
Successor chips should remain roughly the same performance as the chips they replace.
So going forward, 68xx will be ~same speed as 58xx. then 78xx will be ~the same speed as 68xx. 88xx will be ~same speed as 78xx, etc.
After all, that's progress, and giving consumers good value for money. Don't worry about the name, that's irrelevant for consumers shopping for a video card.