Assuming that you want to connect your Delta to your main power "daisy chain," use a Molex connector that has a TWO pin little adapter. They look like the three pin fan risers on your mainboard, but have one pin missing. If you're in a hurry, take a regular Molex to Molex extender or "jumper," and cut one Molex plug off of it. Splice the fan's red wire to the Molex yellow wire. And splice the fan's black wire to the black wire of the Molex connector that's next to the yellow wire. Fold the fan's blue wire and insulate it so that it can't touch anything. One of the two pin to Molex adapters is a lot more elegant. If this is a Delta 38 cfm fan, don't even think about connecting it to a motherboard fan riser.