would a 300 watt 80 plus bronze power supply be more efficient that a 450 80 plus gold power supply?

[solidblake9000]

I have a 450 watt modular 80 plus gold power supply from an old build but I am building a new pc with an intel i-3 8th gen k model with overclock and a gtx 1050ti. Wondering if getting a power supply for the bare minimum recommended wattage would be more efficient, unfortunately they don't make any low watt titanium rated or anything beter than bronze.

 

[R_1]

no.
assuming the rating are accurate the gold is more efficient at any wattage than a bronze or a plus unit.
a platinum unit is even more efficient and a titanium unit is even more efficient.
if you get a 550W unit and it is a gold unit which should be 87-90% efficient it will waste @ 55-60W to produce 550W for a total draw from the wall of 610W
a similar 550W unit but in bronze 82-85% efficient would draw more wattage to produce the same 550W would draw in the area of 625W.

if you get double what you need, assuming 300 is bottom, getting a 600W unit would run a bit cooler and maybe quieter than a 400W unit running at 75 percent (providing the same 300W)