I got two grands and I want an index but my rig is in dire needs of an upgrade, at least my 770 does
Will my i7 3960x @4.0ghz keep up with the index or do I need to upgrade my CPU as well?

Coz if I need to upgrade my CPU, it means I'll have to change my mobo as well, and that means I'll have to get ddr4, so the price is going up and up and up