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It would be a *sucking* fan or aka a fan that will draw OUT air not blow it forward. I would screw it on the outside of the case, and drill another hole to lead the cable in. One other thing, I may be making a total fool of myself by asking this. But I'm a bit new to PC things. Do they have a 3 way fanbus cable? I am having 2 fans, + the heatsink fan.
A 4 pin what you sure take a pic of your motherbaord.