H8DCE User's Manual 2-6 Connecting Cables ATX Power Connector The primary ATX power supply con- nector (J1B1) on the H8DCE meets the SSI (Superset ATX) 24-pin speci- fi cation. Refer to the table on the right for the pin defi nitions of the ATX 24- pin power connector. This connection supplies power to the chipset, fans and memory. Note: You must also connect the 8- pin (JPW1) and 4-pin (PW3) power connectors to your power supply (see below). Processor Power Connector In addition to the primary ATX power connector (above), the 12v, 8-pin processor power connector at JPW1 must also be connected to your power supply. This connection supplies power to the CPUs.
See the table on the right for pin defi nitions. Auxiliary Power Connector The 4-pin auxiliary power connector at PW3 must also be connected to your power supply. This connection sup- plies extra power that may be needed for high loads. See the table on the right for pin defi nitions.
2-8 ATX Power 24-pin Connector Pin Defi nitions (J1B1) Pin# Defi nition Pin # Defi nition 13 +3.3V 1 +3.3V 14 -12V 2 +3.3V 15 COM 3 COM 16 PS ON _ 4 +5V 17 COM 5 COM 18 COM 6 +5V 19 COM 7 COM 20 Res (NC) 8 PWR OK _ 21 +5V 9 5VSB 22 +5V 10 +12V 23 +5V 11 +12V 24 COM 12 +3.3V Processor Power Connector Pin Defi nitions (JPW1) Pins Defi nition 1 through 4 Ground 5 through 8 +12V Auxiliary Power Connector Pin Defi nitions (PW3) Pins Defi nition 1 & 2 Ground 3 & 4 +12V