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PCI-E 2.1 cards backwards compatible?

Liet

Golden Member
Might be a silly question, but I haven't upgraded cards in a while:

Will a PCI-E 2.1 card work in a 2.0 slot? Is 2.1 just a throughput improvement?
 
Thanks much. Been looking at 5870s, but the ones with larger (and I hope quieter) fans seem to all be PCI-E 2.1. 🙂
 
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