Just get a 3-pin or 4-pin (depending on your fan connector) to molex adapter, something like this: https://www.amazon.com/CRJ-4-Pin-Molex-Sleeved-Adapter/dp/B075NPZ94N/ref=sr_1_1?ie=UTF8&qid=1530215327&sr=8-1&keywords=3-pin+to+molex+adapter