I assume your talking about the Jetway 946gzm3 motherboard. If this is correct then your motherboard supports PCI-E x16 Graphics cards. Here is a link to the manufacturers website where you can find more information.
And here is a link to a website called Newegg. The link will bring you to a page showing a bunch of video cards that will work on your motherboard. And are standard PCI-E x16 graphic cards not PCI-E x16 2.0.