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@mavica I have a feeling the proper answer will be an It Depends™️ but I'd be inclined to go for intake into hot, exhaust out the back
that way you've got the bulk of the useful cooling air stuff going to cool the hot bits, and the now warm and not particularly useful air being shunted out the way for more cooler stuff
@mavica 'course, every possibility I'm completely wrong and it'll end up slagging your CPU that way, i r not smert in the ways of temperature control