How does pci-e 2.0 and 3.0 work?

Sanokhin

Honorable
Jan 28, 2013
1
0
10,510
hi. I have Asus motherboard
http://h10025.www1.hp.com/ewfrf/wc/document?docname=c01357064&lc=en&cc=us&product=3750363#N282
( here is a link )
and just had issue with my Video card ATI Radeon 1 GB
http://www.amd.com/us/products/desktop/graphics/ati-radeon-hd-4000/hd-4850/Pages/ati-radeon-hd-4850-specifications.aspx
( 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=)