what is the difference between a "1 PCIe x16 + 1 PCI" and "1 PCIe x16" slot?

Answer 1

For the first one, it could only mean that the graphics card is huge because of its cooling system that exhaust directly outside at the rear of the case. It needs the x16 (16 lanes) PCIe slot plus the physical space on top of the adjacent PCI slot.

The second one is a lean card where the cooling system is confined to within the case. It just needs the x16 PCIe slot.

Answer 2

These are what we call card interfaces. PCI is an older version. PCIe x16 is the new slicker model. If you buy a card (ie. graphics card, usb reader, tv card, sound card, etc.) , it usually connects to the computer through an interface. They can either be in the old, slower, but cheaper PCI, or the newer, faster, but more expensive PCIe.
Currently, graphics cards are the main uses of PCIe, just because they need the speed capabilities provided by PCIe. Everything else, in general uses the cheaper PCI.

Answer 3

If that's what the device requires you to have, then it means you need 1 PCIe x16 slot and 1 PCI slot.

For "1PCIe x16", you only need a PCIe x16 slot.

PCIe = PCI Express
PCI = PCI

Answer 4

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Answer 5

that is mostly found on high end graphic cards that need extra space for the cooler -> the nearby pci slot.