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Google is your friend. This article explains a 5V and a 7V mod.
http://www.techpowerup.com/articles/other/137
On the molex there are wires that supply 5V, 7V and 12V. Getting different voltages involves moving around the wires so they connect to the fan in a different order.
Actually, there is no 7v wire. There is a 12v and a 5v wire. If you switch the ground and 5v wire you get a difference in potential of 7v.