A derivative of the Barts architecture, the HD 6790 is rumoured to appear next week, with its blend based on the Barts LE platform.
The table below suggests many similarities between the upcoming Barts LE part and its vintage siblings - the Barts Pro based HD 6850, and Barts XT based HD 6870.
|HD 6790||HD 6850||HD 6870|
|GPU||Barts LE||Barts Pro||Barts XT|
||255 mm2||255 mm2||255 mm2|
|Transistors||1.7 Billion||1.7 Billion||1.7 Billion|
||840 MHz||775 MHz||900 MHz|
|Performance||1.34 TFLOPs||1.5 TFLOPs||2.0 TFLOPs|
|Texture fillrate||33.6 Gtexel/s||37.2 Gtexel/s||50.4 Gtexel/s|
|Bandwidth||134.4 GB/s||128 GB/s||134.4 GB/s|
||2 x 6-pin||1 x 6-pin||2 x 6-pin|
Marrying up 10 SM units and 800 stream processors, it is believed that the GPU will muster up an 840MHz core speed, tying in with 1GB GDDR5, running at 1,050MHz (4,200MHz effective).
The claimed TDP of 150W has already raised eyebrows, as suggested specifications indicate that whilst underperforming when compared to the HD 6850, the HD 6790 is expected to have increased power requirements.