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I'm not sure about the slim fan under the mobo... it makes sense to exhaust air from the gpu, yet due to watercooling, there's not much airflow on the mobo itself this way. I remember my M.2 being a whooping -16'C cooler with the L9a than having an aio pump/block on.As for under the psu, a slim one certainly fits even with a 120mm aio on the side. If you have your 120mm aio fan pulling air from outside, then I think the case fan underneath should be on exhaust, blowing out all the used air that came through the radiator and ended up below the psu, so it does not acumulate over there. While above, the air can go through the inverted psu and exit on top naturally as warm air does.
I'm not sure about the slim fan under the mobo... it makes sense to exhaust air from the gpu, yet due to watercooling, there's not much airflow on the mobo itself this way. I remember my M.2 being a whooping -16'C cooler with the L9a than having an aio pump/block on.
As for under the psu, a slim one certainly fits even with a 120mm aio on the side. If you have your 120mm aio fan pulling air from outside, then I think the case fan underneath should be on exhaust, blowing out all the used air that came through the radiator and ended up below the psu, so it does not acumulate over there. While above, the air can go through the inverted psu and exit on top naturally as warm air does.
