Will this PSU upgrade work?

That PSU will work much better idk y they would put a 300 watt into such a powerfull computer honestly suprised it didnt kill it but yes this psu will be great corsair is awsome for psu and they not have modular which they only have as they have the patent for it. its also 80plus which is awsome meaning its converts 80% or more of the power from the wall to usabkle poiwer for you parts and its cleaner power.