What is the latest working AMD GPU that is been freed up by GNUtoo?

[Q3g2da]

What is the latest AMD GPU that can be used without microcode?

I have seen here, that evergreen chips are now supported:
https://lists.gnu.org/archive/html/info-gnu/2016-10/msg00004.html

Maybe all pre-GCN cards are capable of running without microcode updates and not having to run VESA.
The radeon driver itself supports even the first generation of GCN cards.

https://www.x.org/wiki/RadeonFeature/#index1h2

Are some of the Northern Islands GPUs also capable of beeing used without microcode updates? Some of those can support Video encode (OpenMax/VAAPI) on VCE.

Thanks for your graet work
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