you can have a pic of card on google type-' 9400gt with no fan-' http://images.nitrosell.com/product_images/1/175//PVT94GYHH2.jpg
i use gpu-z and ATITOOLS to monitor the temps.
before the addition of fan,the temps of card during gaming (assa creed,cod mw)
were upto 82-83 degree C.
now they hardly go over 48.
i put terminals of fan in those which are meant for cabinet fan.
the fan is exactly perpendicular to heat sink and all the airflow strikes the card processor