campatible

hii i want to know that my asus p5-g41-tmlx3 will be campatible with zotac 650 or zotac 650 ti because both the card requires 3.0 pci express and my motherboard has only pci express x16 i had core 2 duo 2.54ghx processor 4gb of ram GS 500 psu corsair iball cabinet