From the research I have done the cpu fan should go above a heat sink. The cpu header fits but what's the point without the fans pushing are out. Like I said it's a deep cooler ls520 going into a asus z690 prime. I can't find anywhere else to put it. Manual, online all say the same but not for this mobos set up with the ls520. Pcpart picker said that it's compatible. I'm trying to get pics but websites are not very mobile friendlyAre you talking the fan header? Also check the motherboard manual it may have one for pump/AIO. Model of motherboard may also help since without it we can't give you specifics.