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3 Technical Reference
Power Supply Specifications
Input Voltages
The 300 watt power supply, designed to minimize EMI, provides sufficient power for a maximum
configuration of the server. The input voltage ranges are:
100-120 V at 50/60 Hz; 4.6 A maximum current
200-240 V at 50/60 Hz; 2.3 A maximum current
If a system is integrated to a fully configured condition, checking the input current rating will
provide an indication of whether the system is overloaded or not. The input current rating should
not exceed 4.6 amperes (for 100-120Vac) or 2.3 amperes (for 200-240Vac).
Output Voltages
The table below lists the total watts available for each voltage. Adjust your loads so that the
combined total wattage for your system configuration is less than 300 watts. For information
about calculating the power usage for your system configuration, see page 59.
Table 3. Power Supply Output Voltages
Voltage
Maximum
Continuous Current Peak Current Watts
+3.3 V 16.0 A 52.8 W
+5.0 V 26.0 A 130.0 W
–5.0 V 0.25 A 1.25 W
+5V Standby 0.8 A 4.0 W
+12.0 V 10.0 A 13.0 A 120.0 W
–12.0 V 0.5 A 6.0 W
CAUTION
Do not exceed a combined power output of 167 watts for the +5 V and +3.3 V
outputs. Exceeding a combined 167 watts will overload the power supply and
may cause the power supply to overheat and malfunction.
The ISA slot(s) on the system board are rated at a maximum of 4.5 amperes per slot. The ISA
specification recommends supporting an average of 2.0 amperes per slot. The average current
usage should not exceed 3.0 amperes per slot; that is, 15 watts.
The PCI slots on the system board are rated at a maximum of 5 amperes per slot. The maximum
power allowed for each slot is 20 watts at +5 volts. The average current usage per slot should not
exceed 3.0 amperes per slot; that is, 15 watts.