sorry for the delay on this, the top two fans are controlled my the corsair pump/control attached to the cpu, connected to the CPU header. The GPU handles the back fan. The front two fans are controlled by the chasis fan header, and the fan on the bottom is controlled by the 3rd fan header i forget the name of the port.
It works well, I have it connected to the AIO_PUMP controller on the mobo, and tuned the fan curve appropriately. Using DC mode currently as I messed up when I order the Noctua fan. But it is strong and provides good air flow. I could see this working well for a non-AIO cooled GPU. But the one that I have still has a blower fan for the memory so I can only think that this bottom fan helps bring fresh air into that part of the case.
The fans are connected to the splitter off of the base and then connected the one 4 pin to the CPU fan header, tweaked the fan curve and have good pressure out of the top with the noctua fans.
Temps idle are around 35-40C, Best I have gotten with the A/C on is low 30s.
Currently a space issue, I have a small desk with draws that currently has my PS4 on it, I am going to eventually get a new desk that is big enough for the pc and PS4.