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.http://www.jetway.com.tw/jw/motherboard_view.asp?productid=508&proname=946GZM3
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.http://www.newegg.com/Product/ProductList.aspx?Submit=ENE&N=100007709%20600007852&IsNodeId=1&name=PCI%20Express%20x16
And this next link is to PCI-E 2.0 Graphic cards that will run on your PC but not at full speeds. You will need to upgrade your motherboard for these graphic cards to run at their full potential.http://www.newegg.com/Product/ProductList.aspx?Submit=ENE&N=100007709%20600007855&IsNodeId=1&bop=And&Order=PRICE&PageSize=20
There are filters on the left side of the website's page so you can find what you want easier and faster. I hope this helps!