As a result of “Barts” graphic core optimization, AMD managed to achieve performance level of 2 TeraFLOPS together with significant decrease of dies size.
GDDR5 memory is paired up with 256-bit width memory interface.
The architecture of AMD “Barts” (picture above) is very similar to what previous generation cards — AMD “Cypress” (picture below) — have:
Let us compare details of both GPUs in the table below:
|Release date||September 2009||October 2010|
|Process technology||40 nm||40 nm|
|Transistor count||2.15 billion||1.7 billion|
|Die size||334 mm2||255 mm2|
There were some major “cut-downs” in AMD “Barts” architecture. Except for one thing: the AMD “Barts” now has two dispatch processors followed by a doubled amount of instruction cache. As a result, with considerable reduction in performance configuration, new GPU is only slightly less powerful than AMD “Cypress”. This is the case when quantity turns into quality:
We have already seen similar architecture optimization in NVIDIA GF104 graphic processor (GeForce GTX 460 graphic cards).
AMD Radeon HD 6870has a full-fledged processor, therefore, the number of execution block has now been changed. AMD Radeon HD 6850 has two SIMDs locked which resulted in reduced number of Stream Processor — 960.