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To be fairly honest, PCI can support a 1Gbit NIC in full duplex just fine in my experiences, and we still have a ton of things that PCI is useful for, and will be useful for the next 5-10 years. To be fairly honest, we may have PCI around even longer unless someone decides to finally give us x7 slots that are x16 lanes each instead of a bunch of junk.[/quotemsg]
PCI has a maximum of 133MB/s for all slots in a system together (not even per slot). Also, PCIe x1 slots, even of the oldest gen 1 slots, have 250MB/s of bandwidth. The common PCIe x1 gen 2 slots have double that at 500MB/s and the less common but upcoming PCIe x1 gen 3 slots have almost double that again at about 1GB/s.
PCI is capable of up to 533MB/s with the right slot and hardware, only 133MB/s versions are supported in modern hardware. I'm not saying we need to get rid of it because it's still common for some sound cards, TV tuners, and other things, but it is showing its age and you don't need x16 slots to replace it. x1 slots do a great job of that as is.