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I am runing out of sata connections and need to expand using a pci card, however, i only have a pci express 2.0 slot available, will a pcie 1.0 (pci express 1.0) expansion card work in a pci express 2.0 slot?

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    I have a PCIe 2.0 card in a PCIe 1.0 slot and it works fine. So, the slot - by that example - is forwards compatible: newer cards work in older slots. I don't see any reason why not that they aren't backwards compatible as well: older cards work in newer slots. You may not be able to get the maximum performance you could have out of the combination but it should still work. – headkase Sep 18 '13 at 3:24
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TL;DR; Yes, you can.

Slightly longer:

PCI express is backward compatible. You can run a PCI-e version 1 device is a PCI-e version 2 slot. You will only get PCI-e version 1 speeds though (which is up to 2.5 megabit per lane).

As to the X16: You can run any card in any slot into which it fits. It will use the maximum available combination of lanes.

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It depends from your host: the compatibility is not really complete. For example, I tried an old network card on a DELL PowerEdge T30, but it did not work. Finally I found the problem was at the PCIe level. The user manual of T30 states NOTE: All the PCIe slots support Generation 2 and 3 PCIe expansion cards. As you see, there is no mention of PCIe 1.0 nor 1.1.

And, in my case, the network card box only mentioned require a PCIe compatible bus. I had to look for the chipset datasheet in order to find the PCIe version required.

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