As long as you have these parts, it is considered Dragon Platform:
PhenomII 9x0
HD 48x0 series GPU
AMD 790GX / 790FX
Consider that the only difference of 790X is 8x 8x PCIe Crossfire compared to 790FX, and no IGP compared to 790GX, you can come to your own conclusion.
But I have not find any benchmark supporting that this configuration is superior to others. It does sound very cool, though, to run a "Dragon" platform.