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1) They do a large production run for lets say Enermax. They do all the models they have ordered and the factories suppliers bring truckloads of ★■◆● to go into the assy... i.e. heatsinks, fans, toroids, fets, ICs, etc. Then the factory goes to work puttin ★■◆● together.
Ever opened a Powmax and noticed that it looked just like an Enermax inside? Well, there ya go.
enjoy the pics, I imagine that you'll notice how the factory owners spare no expense for the employees (Sarcasm) with those great KMart lawn chairs of plastic and the $50 US Dollars a month they get for a wage. Be glad America, you aren't making them.
http://66.58.10.5/images/psufactory/psu_factory.html