a single CPU and GPU will run fine on the PSU you supplied. Video Cards are not supposed to draw more than 300 watts and most CPUs are about half that. You could probably overclock the crap out of both on a 450 or 500 watt on air but its when you get more components and water cooling pumps when you will have to worry about a larger PSU.
I would not go as far as belittling raidmax but I would get a corsair as well, they have incredible build quality for the price and amazing support turnaround. Also seem to have the most stable/consistent power per rail. Some PSUs suffer from having the power draw suffer on one rail if another changes, leading to blue screens, lockups, or in a worse case a blown capacitor or hardware.