Originally Posted by Phaedrus2129
It's not generally worthwhile to "upgrade" a PSU. Either it's good or it's crap. It will be designed for specific components and changing those components can cause issues. Like if you have the impedance wrong on a MOSFET the whole primary side timing can get thrown out of whack. It's not feasible to upgrade it really. About the most you can really do is change out capacitors for ones from a better brand that have the same specs or better.
I have done this to good effect. I got a big beer-can-sized 400V electrolytic, and placed it across the primaries. (Running insulated wires out of the vent holes.)
My computer used to reboot when the monitor degaussed, due to crappy building power. This made it able to ride out some significant power glitches.
But for the hear of the circuit, switching PSU design is tricky, with lots of interacting effects that have to be carefully balanced, and cheap
switching PSU design is even more so, as they pull all sorts of tricks to make parts serve double duty. Thy use interwinding capacitance inside the transformer, they use trace inductance on the PCB.
It takes skill to change parts and have it still function at all
. To make it function better
is essentially a complete redesign.