- Depends on your internal case temps compared to your room temps.
- Do you have a blower style GPU or open air?
- Is the case mutch more restrictive infront compared to on top, bottom or even on the sides (if you have fan ports there ofc)
When it comes to all AIO`s out there it does not matter if the air gets sucked in or pushed out when it comes to radiators (called push or pull)
Only difference is dust cleaning from the radiator, it is more easy if you mount the fans in a pull config.
And by that I mean you mount the fans that the air first goes through the radiator then the fans.
So push or pull it does not matter when it comes to cooling performance. Only thing that does that when it comes to fans is if you mount fans in a push / pull config.
2 fans pushing air + 2 fans pulling air.
But overall on an AIO it does not matter since you will not gain mutch, if any using a push / pull config.