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Pretty much, but I'd change the dimensions of the graphics card to match mini ITX, and so that it could be bolted to the case. This provides two benefits: It can support a bigger and heavier heatsink and it also allows you to spread the VRMs around the chip and DRAMs for more consistent power flow.

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Okay, how about this: The PCI slot goes on the bottom of the mini-ITX motherboard, and extends out of the bottom of the case. The GPU is in its own enclosure, with a PCI edge connector on the top, and you stack one on top of the other.

I'd really like to find a way to daisy-chain them, but I know that's not how multi-gigabit interfaces work.

Raspberry Pi hats are cool. Why not big mini ITX hats? Yes, I just want to go back to the time of the Famicom Disk System, the Sega CD or the Satellaview.

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