Unlike the 6850 & above which are really based on the VLIW4 stream architecture.
No, this is a very widespread misunderstanding. Barts is VLIW5.
The first generation VLIW4 models are:
Cayman (6970 and 6970)
And only them.
The final generation VLIW5 models are:
Barts (6870 , 6850 and 6790)
Turks (6670 and 6570)
You can recognize them by their UVD 3.0, and improved crossfire performance. All of the final VLIW5 generation can be recognized this way.
The VLIW5 generation prior to the final was:
Juniper (5770 , 5750 , 6770 and 6750)
These are recognizable by their UVD 2.2.
I know this is all very confusing. But that's how it is. At least there will be no more VLIW5 from now on, all future GPUs will be VLIW4 and "Graphics Core Next".