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Common slot configurations include x1, x4, x8, and x16, which represent the number of data lanes available for communication A higher number of lanes generally

Yes, a x1 card should work in a x16 slot It's good that you've got it to work in a x1 slot What else have you tried it in besides the x16 slot A lot of budget motherboards, having a x16x8x4 and 3x x1 slots, actually don't handle over 4 GPUs Even if you somehow could run the first GPU

demo slot pg 12 Hot-swap drive bays; 12 SAS3 via opt AOC Expansion Slots: 8 PCI-E Slots: 1 PCI-E x16, The smallest PCIe slot will run at x1 speed, while a full-size PCIe slot will run at x16 PCIe x16 slots are generally intended for use with Graphics Cards