The Five Amp is a throwback to our original 5A Power Supply with some upgrades. It uses a quality 12V brick for the +12V power regulation instead of a +12V converter. The plus side of doing it this way is that whatever amperage the -12V and +5V rails are not using can be used by the +12V rail, which always draws the most of the three.
Five Amp comes in three different power configurations. We recommend selecting an option based upon your -12V rail draw. For a rule of thumb, Red (with red LEDs) will power a single row of 84 or 104HP, Green will power two rows of 104HP, and Blue will power three to four rows of 104HP.