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The desktop doesn't have any PCI-e
slots other than the X16 video
slot so you can't use any other PCI-e card in the desktop, even thought the mini-tower has an available x1 PCI-e slot.
Hardware Requirement: 1x Available PCI-e 3.0/4.0 x4/x8/x16 Slot on Motherboard, if the PCI-e Slot is lower than 3.0, the speed will lower than 10Gbps.
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PCI-E x8 slot: It is 56mm long and has 98 pins. It usually appears in the form of a PCI-E x16 slot, but only half of the data pins are valid, which means that the actual bandwidth is only half of the true PCI-E x16 slot.