Niceeee...
I was wrong... Except for overload protection circuit, ST50F is good..
But i find it as an important factor in a good PSU...
If someone is looking for a 500W unit, ST50F is an ideal choice..
My friend has it and i made a head to head comparison(i.e, 2*dell inspiron 14) of VS4121 n VS4621...
vs4621 sounded like no bass... mids were muddy.. highs were almost same..