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275 Watt Power Supply Specifications
Input Voltages
The 275 watt power supply, designed to minimize EMI and RFI, provides sufficient power for a
maximum configuration of the server. The input voltage ranges are:
•
100-120 V∼ at 50/60 Hz; 6.3 A maximum current
•
200-240 V∼ at 50/60 Hz; 3.5 A maximum current
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 275 watts.
For information about calculating the power usage for your system configuration, see the
calculation worksheets on page 47.
Table 3.
Power Supply Output Voltages
Maximum
Continuous
Voltage
Current
+3.3 V
11.0 A
+5.0 V
26.0 A
–5.0 V
0.5 A
+5V Standby
0.1 A
+12.0 V
10.0 A
–12.0 V
0.5 A
NOTE
As an overall current usage limitation on the power supply, do not exceed a
combined power output of 147 watts for the +5 V and +3.3 V outputs.
The ISA slots on the server 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 server board are rated at a maximum of 5 amperes per slot. The maximum
power allowed for each slot is 20 Watts a +5 volts. The average current usage per slot should not
exceed 3.0 amperes per slot; that is, 15 watts.
The cooling efficiency varies per slot; therefore, ensure that adequate cooling is available in the
target slot—especially in an expansion slot drawing more than 2.0 amperes.
36
Peak
Current
Watts
36.3 W
130.0 W
2.5 W
00.5 W
13.0 A
120.0 W
6.0 W
Technical Reference
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