PCI Express 2.1

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Yes all PCI Express is backwards compatible.
 

restatement3dofted

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Jan 5, 2010
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Yep. PCI-e 2.1 just implements some of the "administrative" systems that are going to be part of PCI-e 3.0, such as troubleshooting and support. In terms of speed, PCI-e 2.0 and 2.1 are exactly the same. Manufacturers are just using PCI-e 2.1 as a way to jack up prices on cards that offer absolutely no increased performance over their PCI-e 2.0 counterparts.