If you going to overclock please send exact modell of gpu and cpu it can already be overclocked, if you didn't purchase retail copy. If you get what i mean.
There is many manufacturers that is handing out same kind but with a diffrent modell and looks. Like evga, gateway, gigabyte.
1.6 voltage aint to much for the newer cpus. you can aim for 1,9-2,0 at the most. 1.6 is alright.
After that i can help you out!