I am in the process of figuring out what I want in a new computer and am very confused at all the different kinds of PCI slots. I see motherboards with: PCIe 2.0 x16 (at x16/x16/x1 or x16/x8/x8 mode) PCIe 2.0 x16 (at x16 mode) PCIe 2.0 x16 (at x8 mode) PCIe 2.0 x16 (at x4 mode) PCIe x4 PCIe x1 PCIEx1_1 PCI 2.2 PCI What are all these different configuration slots used for? There's probably more that I don't even know about. Physically there seems to be 3-4 (maybe more?) configurations to these slots. And what the heck is True @16 3-Way SLI? What I am looking for is maximum expandability in a Motherboard. I want to be able to add Controller cards for extra 1394 or extra IDE drives. Add a sound card. Or be able to add who knows what. Any information you can give me about what all these PCI slots are about would be appreciated.