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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.
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I read that the Dell XPS 8300 came with a PCIe (x16) slot (where the video card goes in) and three PCIe (x1) slots for any other cards you may want.