Ok, so that's one of the worst models EVGA has ever sold. The W1, B1, NEX and B3 units are pretty low quality. Definitely they were never intended to be paired with gaming cards or high demand systems. I'd definitely recommend replacing that with a better unit, especially since you clearly have recently upgraded the rest of your system.
Last thing you want is a poor quality power supply cutting the useful life of your new motherboard in half because it has poor control of ripple and noise, which it will, since ripple overheats capacitors. This is a known problem and is well documented when it comes to prematurely failing motherboards.
It won't improve your gaming performance, but it WILL allow you to GET a better card later and still have a system around it that makes it WORTH getting a better card for. Not so if if your motherboard or something else fails or is damaged due to the low quality of that unit.
Certainly with a brand new card I'd not want to continue using that unit. Also, how old is that PSU? Did you just get it, or has it been in use for a while? If it's more than a year old already, the chances of it having increased problems even beyond the fact that it wasn't great to start with are much increased.
This would be a really good first step, even though I'm sure you'd prefer to upgrade the GPU card FIRST, I don't think that probably ought to be your first step. Totally up to you of course, just my recommendation.
PCPartPicker part list /
Price breakdown by merchant
Power Supply: SeaSonic - G 550W 80+ Gold Certified Semi-Modular ATX Power Supply ($66.59 @ SuperBiiz)
Total: $66.59
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2018-01-14 21:01 EST-0500
There are some alternative choices that would still be better than what you have now, but that is a pretty damn solid unit right there for the price. You could use that through several sucessive builds or upgrades, based on it's performance and quality.