It's a very good PSU.
though as I mentioned above, I doubt that the MB will support the CPU overclocking. Even if it has the BIOS option, the power delivery to the CPU will not allow it to clock much higher than stock. at stock, the CPU is not pulling over 100w.
BTW, the max memory speed support is 2133MHz on this MB (unless HP hide something).
As for GPU, if you take the time and have good enough cooling (good case airflow and good GPU cooler) the card can pull 300 and may be a bit more under load.
so you are looking at ~400w combined extreme load which is not gonna happen in real life usage scenarios like gaming.
So to begin with, you don't need the new PSU right now. Though RMx 550w is an excellent one.