i havent received my vv mod yet but its my understand that the higher the ohm the attys or carto is , the higher you can crank the volts.. ive herd that 9ish watts is i deal i think the formula is volts + ohms x ohms / ohms= watts so 5 volts + 3.0 ohms x 3.0 ohms / 3ohms = 8 watts.. I may be totally wrong on my formula im jsut going off of what i remember reading or what i think i remember of it lol ... but you should check out the provari if you interested in VV mods .. i so stoked about mine i havent gotten it yet so i cant give any proof of how good it is