Should I buy a new power supply too?

I want to upgrade my GPU from the current GTX 760 2GB to a GTX 980 but I have no idea on whether I should buy a new power supply as well. The other computer parts are an MSI motherboard, 1TB HDD, DVD-RW, 8 GB RAM DDR3, 2 120 mm fans and a core 15-4670k CPU. Will I run into compatibility issues with the power supply? Anyone with a solution or a new way of handling this please advise me
