Ok, then it might be time to upgrade that as well. I've never heard of that brand, but from a quick research session of 30secs it doesn't look good.
Although it might work without any issues, those cheap PSU's tend to burn out at full load, and i don't want to imagine what it might do with a 980ti..
Get a good 600W+ power supply from Seasonic, XFX, Corsair (NOT CX/CXM/VS), Silverstone etc..