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PCI x1 is just another kind of PCIe slot. it's meant for cards with lower bandwidth needs, such as modems, sound cards, etc. PCIe is flexible like that, with 1x, x2, x4, x8, x16 and I think even x32 slots being possible to implement. An x16 slot has 16 "lanes" that can be used for data transfer, and x1 has only one lane. Each lane allows 250MB/s bandwidth in each direction, if I remember correctly.
Motherboards with both PCIe and AGP are possible, it depends on the chipset makers to make it heppen. So far, I don't know of any boards out with such a chipset yet.
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