It is difficult to know how RD790 crossfire, bios and most of the settings were configured as how it works, Shamino and Kinc got 27000 with a pair of ASUS Radeon HD 2900 XT overclocked to 1175/950MHz and with a Kentsfield at 5.1 GHz.

Total Points: 27039

SM 2.0 Score 11273 Marks
SM 3.0 Score 12088 Marks
CPU Score 7619 Marks

If Phenom is far superior than Kentsfied it is clearly possible. CPU score was 7619 marks, maybe a fast IMC and some advantages combined would result in this outcome. It is hard to believe and I doubt that a Phenon clocked at 3.0 GHz is faster than a 5.1 GHz kentsfield.