Standard ATX power supplies have several power rails, used by various components. Our DC-DC converters take 12V in and produce several ATX compliant voltages as follows:

Rail	Circuit Type	Board Type	Comments
12V	3.5", 5.25 motors, fans, P4 power	mostly P4 boards (lots of power), FET drive on all boards (little power).	Use PW-120/200  when using 3.5" drives or P4s
5V	General M/B and disk circuitry, Memory, laptop drive motors	All Boards	All our DC-DC converters have adequate power on this rail
3.3V	CPU core, Memory	EPIA-5000, 800, V, M-10000, CL, EPIA-MS,  etc	All our DC-DC converters have adequate power on this rail
-12V	Some older serial comm. chipsets	EPIA-M, EPIA-M2 (EPIA-5000/800/V does not use the -12V for serial ports)	Check the serial driver chipset. Modern serial chipsets do not use the -12V rail.
-5V	Obsolete	NONE	Removed per ATC12V power supply guideline. Used only by ISA cards
+5SB	Memory, vital sleep functions	ALL	Uses little power

In most cases, it will work without any problems. If you need more power, you can get the 20-pin to 24-pin adapter or our 24-pin ATX power supplies (M4-ATX and the picoPSU-150-XT).