During recent AMD presentation made for its partners one of the slides revealing detailed specification of upcoming graphic cards based on AMD Barts GPU somehow leaked into the hands of Chinese Mass Media and now it can be found on internet:
According to slide, there will be two models Barts Pro and Barts XT. Obviously, its names will be changed to Radeon HD 6750 and 6770 since Barts is the successor to Juniper and the last one is known to be used in Radeon HD 5750 and HD 5770 graphic cards.
Common innovations include:
- 256-bit memory controller that significantly increases the number of pins, as well as the size of the GP
- based on the Cypress dual engine architecture and features full Cypress AA and pixel render performance
- number of ROPs has doubled to reach 32
- 8 memory chips of DDR5 memory are placed along a 256-bit memory interface to form 1 Gb of video memory
Other factors create differences between Pro and XT variants. For example, Pro and XT use memory clocked at 1000 MHz and 1200 MHz, respectively, which gives theoretically almost 100% memory bandwidth increase; number of TMUs are 40 for the Pro version and 48 for the XT.
Another distinction is the number of stream processors which amounts to 960 for XT and 800 for Pro variant. Interring is the fact, that compared to Juniper the number of streaming processors generally increased only by 20%. However, the major change of Barts is SIMD restructuring. The number of SIMD for Pro version is 10, while it is 12 for XT variant. Thanks to Cypress dual engine architecture all SIMDs are divided in two blocks, each having 5 or 6 SIMDs blocks, respectively. As you might remember Cypress based cards had two blocks of 10 SIMDs each.
As for power, AMD plans the Pro version to consume less than 150 Watts, however XT’s power consumption versions exceed 150 Watts.
Increased number of ROP units, together with the 20% increase in the number of shader processors gives Barts based solutions a competitive advantage against its main rival — NVIDIA GeForce GTX 460.
AMD does not expect something big from new GPU. The company’s aim for this GPU is to market a strong competitor capable of withstanding against GeForce GTX 460 series videocards.
A matter of public concern — When?
Usually, when AMD makes such presentations for its partners it is about three months away from public release, so luckily, we will have new videocards by Xmas which is also a good marketing trick.