Pci 3 backwards compatibility

Will a PCIe 3 card work in a 1.0 slot? Obviously, this takes a major hit to bandwidth but I'm looking at slowly upgrading my system one part at a time if possible.
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  1. WorldPhoenix said:
    Will a PCIe 3 card work in a 1.0 slot? Obviously, this takes a major hit to bandwidth but I'm looking at slowly upgrading my system one part at a time if possible.


    It will probably work, however, there have been problems with 2.1 in 1.0, so I'm guessing there may be problems with 3.0 in 1.0 also.
  2. I've read that there are rarely any problems with 2.1 in 1. Perhaps I actually read about 2.0. Either way, if anyone can confirm that it will work that'd be great.

    It's just so expensive to buy an entire system outright that has the capability of being upgraded further down the line.
  3. 2.0 works fine in 1.0. But the fact of the matter is, sometimes it works, sometimes it doesn't. You just have to try it (I believe). There isn't a surefire way to tell if a 2.1/3.0 is going to work in a 1.0.
  4. The incompatibility issue arises when the motherboard's BIOS and/or the graphics card maker has done something stupid and has deviated slightly from the published PCI Express specifications.
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