I use that with OD v.0.2.6 on my Sapphire V64 nitro+:
GPU_P0=852;800
GPU_P1=991;820
GPU_P2=1084;825
GPU_P3=1138;850
GPU_P4=1150;910
GPU_P5=1202;875
GPU_P6=1212;875
GPU_P7=1478;920
Mem_P0=167;800
Mem_P1=500;800
Mem_P2=800;825
Mem_P3=1100;910
Fan_Min=400
Fan_Max=2400
Fan_Target=40
Fan_Acoustic=0
Power_Temp=65
Power_Target=0

Try to set target temp to 50C to look what should happen.