I don't have any exhausts in my system at all, I have a 120mm 1080TI SC2 hybrid AIO intake on the side bracket, and a 240mm AIO in the bottom. Z370-G motherboard, 5.2ghz 1.425V overclock on 8700K.
VRM temps were really high in synthetic testing(105C+, measured via temp gun on the back of the motherboard) but as soon as I added the 120mm side bracket intake, even though a radiator is in the way, it brought them down to 80-90C. A tiny bit of airflow goes a long way I guess.
I would say as long as you have any fan airflow of any kind vaguely near the VRM it would probably be fine.
I was curious if you've tried that setup with the side gpu AIO as exhaust instead of intake with a rear fan intake? And if so what was the vrm temps like? A fully utilized hybrid gpu dumps a lot of heat out of the rad, I always prefer to exhaust a hybrid gpu rather than use it as intake.
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