9 minutes ago, SlimShady99 said:
Wait, wouldn't then the 3 fans of the GPU and the 3 at bottom as intakes, be "fighting" for the air? And therefore no intake, only 3 exhaust at the side for the CPU?
The bottom intakes would be feeding the graphics card air, and would most likely improve thermals on the GPU by quite a bit.
I just checked out Hardware Canucks' video regarding airflow inside the O11 Dynamic (here), and it looks like the most balanced configuration with 9 fans was intakes in the bottom and side, with the AIO radiator in the top as exhaust. Granted their testing was done with a graphics card with a blower style cooler, but still that sounds like a good setup for the fans.
Until you get the additional three 120mm fans you mentioned though, I still think that 3x 120mm intakes in the bottom and AIO in the top or side as exhaust would be the way to go. If all you're focused on is CPU thermals though, then I'd try the AIO on the side as intake (the fans pulling air from the exterior through/into the radiator).