CPU does not matter, since everything is running, but missing Overdrive feature which is available under Windows, but not under Linux. I am using 2xHD6970 with Catalyst 11.5 downloaded from AMD's website. Some of the overdrive features like GPU core speeed can be set through aticonfig...
Did some research at the weekend and I found ADL_Overdrive5_PowerControl_Get and ADL_Overdrive5_PowerControl_Set, but those are undocumented in the ADL SDK.
These can be found in libatiadlxx.so
Some of them are documented, some are not.
0001e1a0 T ADL_Overdrive5_CurrentActivity_Get
0001e350 T ADL_Overdrive5_FanSpeedInfo_Get
0001e540 T ADL_Overdrive5_FanSpeedToDefault_Set
0001e410 T ADL_Overdrive5_FanSpeed_Get
0001e4c0 T ADL_Overdrive5_FanSpeed_Set
0001e580 T ADL_Overdrive5_ODParameters_Get
0001e630 T ADL_Overdrive5_ODPerformanceLevels_Get
0001e770 T ADL_Overdrive5_ODPerformanceLevels_Set
0001e990 T ADL_Overdrive5_PowerControlInfo_Get
0001e920 T ADL_Overdrive5_PowerControl_Caps
0001ea10 T ADL_Overdrive5_PowerControl_Get
0001eaf0 T ADL_Overdrive5_PowerControl_Set
0001e2e0 T ADL_Overdrive5_Temperature_Get
0001e240 T ADL_Overdrive5_ThermalDevices_Enum
May CCC uses ADL to modify settings?