Lots of confusion about the Enermax. All of them from the 285 on up have 2 temp controlled fans. I think that they are all referred to as "Whisper" models, rightfully so.
Standard model has a harness that allows the mobo to monitor the exhaust fan rpm. internal temp sensor.
Fan Control (FC) model exhaust fan must be powered externally, usually by the mobo, and also has rpm monitoring. Basically, the board can shut that fan off in sleep mode, same small amount of noise as the standard model when running.
FC model also has a remote temp sensor. I suppose it could be attached to some warm spot like the northbridge chip or HDD to speed up the fan and assist case cooling.
Seems like the marketing guys are in the ascendancy at Enermax, the extra "features" of the FC model would only be useful in special circumstances...