Sorry, I meant PCI-e *slot*, aka Xorro. You can't put a real PCI-e card into it and have it work.
I was under the impression that the Xorro slot was behind and in-line with a x1 PCI-Express slot, so you can ignore Xorro and plug in a standard x1 PCI-Express card. There's nothing b0rked about it being a PCI-Express slot.