I'm planning to upgrade my HD 5750 with a GTX 660 ti.
But just before the purchase, i saw that GTX 660 ti is a PCIe 3.0 card . My mobo is having PCIe 2.0 slot. So will the GTX 660 ti run in my system???
Yes. The PCI-E thingy is all backwards compatible. I'm also positive that the card will run normally without any restriction regarding bandwidth when you have a PCI-E 2.0 x16 slot (make sure it runs at x16).