I have used a lot of EVGA power supplies the last 5-10 years.
Other than the supernova G2's being a bit poopy, they have been doing great (850 watts+)
My current 1000 G3 has foolishly tiny voltage ripple, which has been PERFECT for getting cpu cache and memory overclocks to their maximum.
In my opinion, just check your current power supply out. If modular, throw on a molex 4pin cable, and use a multimeter, and watch the voltages. If they are jumping around alot, a new PSU is a good thing.
But if it can do the 12v rail super solid and never dip below 11.90, it is still fine to use.