best motherboard for over clocking amd fx 3600 ?

4+1 or 8+2 refers to Power Phase Design. These are power delivery mechanisms to your CPU and RAM (to make it understandable easily) More on these numbers means more stable power to your core components hence good reliable and durable performance by the components. My recommendation is Gigabyte UD3P here for its better power phase design.

http://pcpartpicker.com/part/gigabyte-motherboard-ga970aud3p

What is your budget?