Where in the M4A785-M BIOS is the voltage?
Go into the BIOS > Advance > JumperFree Configuration > CPU Over Voltage
and what would recommend for me at 3.5 Ghz?
You want enough volts to give you a stable overclock while keeping the temps in limit. So run Prime95 @ 1.35V while running Core Temp. I don't think you need much Vcore for 3.5Ghz.