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Overall not recommended. Under full load in this position A9x14 will make a lot of noise. It will only fit in pull config, with the motherboard and riser cables pressing against the plastic fan guard. If you use a low-noise adapter it won't do much cooling. v4 will have an actual fan position here, so it should work fine.


Before fitting a case fan you can try plugging it into the case fan power and going into bios, with the side panel removed. You can then test it at different speeds against the bottom or side panel in pull vs push. You should hear an annoying buzz when trying the pull config. It will be even worse under the mobo, since the mobo and riser cable will push against the fan and further obstruct the airflow, causing more noise from the fan.


If you still want to try the fan under the motherboard, the easy way to do this is to first unscrew the motherboard, squeeze the backpanel inside the case, and unplug&loosen the power cables from the mobo. You can then shift the motherboard up to give space for the fan, and then pull the mobo back down in place. This way you don't have to pull apart your entire build to try the fan.