Quote Originally Posted by saaya View Post
how could it be 384bit if its pin to pin compatible with the 5000 series? maybe not pin to pin but i thought pcbs could be reused, cutting down ttm big time and reducing costs?
Perhaps it's not Cayman which is pin compatible with Cypress, but Bart instead. A 256 bit 32 ROP 1280 SP (320*4) Cayman might end up around 270-290 mm^2, with perhaps ~HD 5850-5870 performance, it should be a pretty potent competitor for GF 104 derivatives chip in US$ 180-220 price segment.

I see Bart as a HD 4770 vs HD 4850, but instead using new process node to gain added efficiency (perf/watt or die area), it uses new mArch development such as rumored shader/SIMD rearrangement of the current ATi's GPU mArch. Pretty similar to nVidia's approach in GF 104 development that succesfully beats its bigger brother in perf/watt & die area while still using the same proces node.