Well finally got my Zalman 700 on my GTX and its cooled it to 40c idle but i can hear abit of a what i can only describe as a windy noise, abit like the air the fan is blowing out is funnelling through somewhere and making a slight whistle effect noise. Is this normal? There are about 5 holes left on the card where screws used to be, maybe the wind is travelling up through those holes? Thoughts please.