I don't totally get what you are saying but I wouldn't go past 9 amps 10 tops on a molex connector that being said a higher wattage TEC operating at lower input voltages are more efficient than a lower wattage operating at a higher voltage. At the same time the lower wattage TEC will get colder but will be unable to move as much of a load. So anything above 9 amps I would not power from a computer PSU. I had my 136.8 watt ones going at 12v and the tails got pretty darn warm and that was only at 7.2a. I believe the max current for a molex is 9 or 10 amps. Hope that answered the question if not I'm sure Jimbo will say it better.