NO NO NO
The 68xx (Barts cards) are not a direct replacement of anything. To call them replacements for the 57xx is misleading. I understand what Ares is saying (i think) but what omgitzfatal posted " Remember the 68xx are to replace the 57xx series, not the 58xx series." Is a bit misleading.
The Barts chip is basically a refined and cut down Cypress chip and its position and pricing is more a reflection of how well received the GTX 460 has been received along with the need to make some room at the bottom end for fusion chips (CPU's with built in graphics).
The main idea is to fill in the big gap they left between the 5770 and the 5850 last time around, this means a step back to how it was back with the 1xxx cards, more derivatives between bottom and top so there isnt a neat little Bottom =5xxx to mid= 58xx to high=59xx.
Quite whats happening with the 5770 i don't yet know but for now its staying where it is rumours say it may get a few tweaks and be renamed to the 6770. What ever they decide to do we will end up with 4 segments.
6750/6770 6850/6870 6950/6970 6990.
Juniper ? Barts Cayman Antilles.
So its more of a repositioning of the segments to fit in the extra one and allow some room at the bottom to let the Fusion chips in.
If we have to look on it as whats replacing what then it would go like this.
Juniper will probably get tweaked and end up with better performance and when that happens that is the 5770 replacement.
Barts (68xx) is a new segment to itself really but if we must its replacing the 5830.
Cayman (69xx) is replacing Cypress (58xx)
Antilees (6990) is replacing the Dual Cypress card (5970)
Mactronix