i don't blame you at all, if i built stuff like that i'd go crazy with it myself.
my idea wasn't necessarily banking on the airflow behind the mb, but the physical size of the heatsink. the mb tray itself is fairly large, plus the fact that it's fairly well attached to the main part of the case. with that in mind, i was thinking it would do reasonably well for heat dissipation.
i've never tried it, it's just something i've been thinking about. i think i might try this, see if it works. maybe combine it with cooling on the topside as well.
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