The diagrams all show the same standings. For example, the Radeon HD 6790 is faster than the Gigabyte Radeon HD 6770 by an average 15% in the FSAA-less mode and by an average 15.2% when we enable FSAA.
The Gigabyte is ahead of the ASUS because the latter's memory clock rate is reduced by 800 MHz. This makes the Gigabyte card 6.6% and 6.8% faster with MSAA turned off and on, respectively.
The PowerColor Radeon HD 6750 is 17 to 21% slower than the Gigabyte Radeon HD 6770 depending on the graphics quality mode.
There is no point in drawing a comparative diagram for Radeon HD 6770 vs. Radeon HD 5770 because these two cards deliver the same performance if clocked at the same frequencies.
Here is a table with the full tests results: