AMDs professional mobile GPUs (FirePro M Series) use the same hardware as their gaming equivalent (Mobility Radeon HD Series)   The difference lies in the VBIOS and in the specialized driver. This allows to simply change a 6970m into a FirePro M8900 by simply flashing the appropriate VBIOS and installing the corresponding driver: (UPDATE: This also works with the 6990m, see the update at the end of the post)