[ubuntu] PCI Express - backward compatible?

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http://ubuntuforums.org – It seems my video card, a GeForce 7300GS has died. My motherboard manufacturer told me that the PCI-E slots on the board are v1. The motherboard is an EVGA nForce 590SLI. I'm having a hard time finding an older video card with v1 PCI. Can I use a more up-to-date v2 or v3 video card in this motherboard? In other words, is the PCI spec backwards compatible? (Hardware)