How does pci-e 2.0 and 3.0 work?

hi. I have Asus motherboard
( here is a link )
and just had issue with my Video card ATI Radeon 1 GB
( link again)
So... i need another video card, coz mine is dead... i have problem with understanding difference between PCI 2.0 and PCI 3.0. seems like my board doesnt support 3.0 is it true?
if it doesnt - there is no reason to buy grafic card with pci 3.0 and i can save some money)
thx for support=)
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More about work
  1. For PCIe 3.0 support on Intel platforms, you need either an LGA2011 CPU or an Ivy Bridge CPU on LGA1055.

    A PCIe 3.0 card should work fine in a PCIe 1.0 slot or vice-versa, it will simply run at PCIe 1.0 speeds without the extra PCIe 3.0 features.
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