All the pci-e gpu are backwards compatible .i.e. PCI-E 2.0 is compatible with pci-e 1.0. You can run any latest pci-e 2.0 graphics card in your MB with lower speed. So if your budget is 10k INR and you have a good 550 to 600 watt psu then go for nvidia 560 or amd 6870. If your psu is lower than that then get a amd 6670.