Nvidia 9600gt + Artic cooling Twin Turbo

I have a nvidia 9600gt and a arctic cooling twin turbo pro heat sink. My question is how do i connect it to the gpu so that i can control the fan speed? (it is supposed to be able to do so, but the only cables from it are for power as far as i can see, and there is only one place on the card they could connect to a set of pins labled J305 which means nothing to me or google) It is otherwise installed and working, i would just like to be able to control the fan speed as well.