AMD's HD 6950 is unlockable
http://www.fudzilla.com/graphics/ite...-is-unlockable

AMD even made the process a bit easier as AMD included the dual-BIOS feature on its HD 6900 series cards and if something goes wrong you can always go for the recovery/factory protected BIOS.
This should be good for open source development, for those who want a completely 'free' solution for graphics acceleration.

Here is a video of how to unlock the card: