Strange Performance Issue / R290X

[ecos]

Have already run --autofix on both systems (when using the R290X). Both perfectly identical, same init.

6990:
aticonfig --pplib-cmd "get activity"
Current Activity is Core Clock: 830MHZ
Memory Clock: 1250MHZ
VDDC: 1120
Activity: 98 percent
Performance Level: 2
Bus Speed: 5000
Bus Lanes: 16
Maximum Bus Lanes: 16

R290X:
aticonfig --pplib-cmd "get activity"
Supported OD6.
Current OD6 Status is
Core Clock: 1000MHZ
Memory Clock: 1250MHZ
Activity: 100 percent
Performance Level: 0
Bus Speed: 8000
Bus Lanes: 16
Maximum Bus Lanes: 16

./od6config --autofix

Adapter 0: AMD Radeon R9 290 Series
New clocks : 1000 Mhz core, 1250 Mhz memory
New fan speed : 100%
New powertune value : 50
New target temp : 95

./od6config --get=clocks,fan,temp
Adapter 0: AMD Radeon R9 290 Series
Core (Mhz) Memory (Mhz)
Current Clocks : 1000 1250
Min Clocks : 1000 1250
Peak Clocks : 1000 1250
GPU Load : 0%
Fan Speed : 0% (0 RPM)
Current Temperature : 62 C
Target Temperature : 95 C