My Antec SmartPower has a thermistor mounted on the circuit board. It's a green bead labelled "RTH2" and is close to the heatsink but doesn't touch it. By bending it over slightly so it touched the heatsink and by applying epoxy as a heat conductant, I was able to make the fan run faster. Another thing you could try is connect a resistor across the thermistor to make it seem like the temperature is hotter than it really is, and there are some resistors near the thermistors that can be change in values to change the voltage. There may be a small transistor or a TL431 shunt regulator that looks like a transistor, only the circuit board is labelled Uxxx next to it, not Qxxx.