My speculation.
* Antilles: 6990 ~300W = 2*Barts
* Cayman XT: 6970 ~270W+
* Cayman PRO: 6950 ~230W+
* Barts XT: 6870 ~200W+
* Barts PRO: 6850 ~170W+
* Juniper XT: 6770 ~140W+
* Juniper LE: 6750 ~110W+
* Turks: 66xx / 65xx ~80W+/~60W+
* Caicos: 63xx / ~50W+
The consumption is just "thrown in" for my point in naming scheme. If Cayman is big die with 250ish consumption, then there really cant be Antilles = 2*Cayman and in that case also Antilles can be only "little" faster than Cayman. So naming like this would make lot of sense.
Oh, and yes in this scenario it would make sense for Cayman to have 384bit memorybus.
PS. for nVidiots, yes renaming 5770 is bull, they should not rename it even if it takes that place in lineup.
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