1 additional PCI-Express x1 slot is needed

PCI-E X16 Slots can run in x1, x4 , x8 and x16 modes so you can install a x1 card in a x16 slot without worries of shorting anything as long as

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

pciex16 slot No, it is not possible to use a PCIe x16 card in a PCIe x1 slot The physical design and specifications of a PCIe x16 card are different from a

pciex1 slot 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