I dont remember the model being honest, but so far i didnt have a single power with the psu yet, and also it has both connectors.If your PSU was able to power the 480 it should power the 2060, which has lower power requirements.
Make sure your PSU has a 8-pin PCI-e (or 6+2-pin) power connector.
What's the model of the PSU?
I have 8gb at 2133mhz since is the max for the mobo, cant go over 2133mhz.how much DDR memory do you have? the 2060 will rock for sure keep in mind its 128 bit and the old 480 is 384 bit