x2 - yes, you should be ok. The i3 only draws 50-60watts, the GTX 1060 only draws 100-120 watts. Add in some overhead for HDDS (20w), motherboard/ram (50w) and a few fans (20w) and you're only worst case 270ish watts assuming you have everything running full tilt. Actually, that puts you right in the sweet spot of the efficiency curve for a 500-600w PSU (50% load).