That's a slightly ambiguous question. PS supplies are like girls - they come in different configurations and everybody may have there own preference. Do you like them long and thin or short and compact?
In terms of brute Watts/cubic inch I suspect the original on this thread I started with is hard to beat. It puts out a lot of power for a very small box, the 2x12=24V version is even scarier. I personally use an old Cisco Router PS on the bench which is long and thin and fits better (as well as being lots quieter) because it supplies all the current I need most of the time.
I've seen two long thin ones put two together for 24V and put in a field box with chargers etc on top - nicely compact overall..
Originally Posted by die4good
I have another question. which one is the most compact server PS that successfully converted.