13thmonkey, there is no switch, I looked.
rolli59, does it matter if some of the #'s are different, like the one you recommended says:
+3.3V@20A, +5V@20A, +12V@28A, -12V@0.8A, +5VSB@3.0A
But mine says +3.3V@24A... like does the difference between 20A and 24A make a difference?
As ko888 has already replied then those amp outputs are not critical unless your system is old. Modern system use most of their power from the +12volts. That PSU will pretty much run any std system that has been put out this century.