Hi. I overclocked my HD 6670 1GB DDR3 as shown in the picture. I played COD:Ghosts for around 30 mins without any issue. My question is that can I use this frequency permanently? I mean, is it fine if I use it for long term gaming? I used Sapphire trixx for overclocking. When I restart my pc, the values are resetted. I have to overclock again. Any idea what i should do?