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You don't put the graphics card on the motherboard, You put the motherboard on the graphics card : r/pcmasterrace
Asus Made a Motherboard That Can Fit 20 Graphics Cards | PCMag
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Amazon.com: LGBOY 12 GPU Mining B250 Motherboard Support G3900 CPU LGA1151 DDR4 RAM Maximum 16GB Mainboard for 12 PCIE 1x 16x Graphics Card Support VGA DVI for Miner Dropship with SATA Cable+Switch :