12vx36amp = 432 wattage in Full
Officially, 980 Requires 500W Power for system.
980 with full system Stress won't even crosses 450W mark. You already have enough power to run system under heavy Gaming. i assume your current PSU is 100% functional, and nothing is tripping. it will work good then.
However, i will suggest you to upgrade your PSU to better brand+quality in near future. Look 600w rating on PSU, but actually it won't even delivering 500W, after calculation it max drawing output for Full Rig is 432W, which is below standard if you compare with others CM PSUs arient' the good ones until Silent pro. With any increase in power consumption, let say overclocking, it can bound you.