ok, looks like nobody liked my other idea, and i was thinking about it last night, and came up with another solution that's still fairly simple but doesn't include watercooling.
now this will only really work on an aluminum case, if it works at all. again, it's just a thought i'm throwing out there.
what if you made small copper (or aluminum) blocks, cut the size of the back of the hot parts on the board (obvisously we're focusing on the fets here).
make the thickness of the blocks the thickness between the board and the mb tray (case). mount the blocks on the back of the board using frag tape or some thermal epoxy. then toss a little thermal paste on the other side of the blocks, and mount the motherboard. the thickness has to be pretty exact, so it contacts properly.
now what i'm thinking here is this would use the aluminum case to your advantage. the aluminum case parts would be used as a gigantic heatsink, providing what i would think to be a considerable amount of silent heat dissipation.
you could probably use ramsinks or something similar as well, as long as they were the right thickness, but i'm not sure as that would work any better than just solid metal blocks.
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