This is what my Power Tower manual says:
'To use the Turbo Switch (it's labelled 'Turbo' btw) to control some function of an expansion card, you should now attach the red and black cable from the LED interface board to an appropriate jumper on your expansion card. If you do not do this, the Turbo button will nave no function (although the light will still go on).'
In other words it's a spare switch.
Cheers,
JaX
