PCI 2.0 graphic card on pci 1.0 mobo?

Need Compatible Graphic Card for Intel 946GZIS
My PC configuration is :

Mother Board:Intel® 946GZ Express Chipset
Processor :Intel® Core™2 Duo Processor E4400 (2M Cache, 2.00 GHz, 800 MHz FSB)
Ram : DDR2 1GB(Going to upgrade)
Monitor :Samsung p2370 MS 23" monitor
PCI : 16x pci express 1.0 in some places it is mentioned as pci express 1.1

My budget is ~ $100

I need HD videos, want to play high graphic games like fifa12,gta 4

Please give your suggestion