Specifications

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6: Site Requirements
System Power Requirements
Table 6-2 lists the electrical specifications for the SGI Origin 3900 server.
Note: Table 6-2 lists the maximum numbers; other configurations might require
significantly less power.
The calculated power consumption for specific Origin 3900 rack configurations is
available from your SGI site planning representative. Refer to Chapter 9, “Summary”
for contact information.
Note: To maintain a ground potential of less than 250 millivolts between interconnected
Origin 3900 systems, SGI requires that all power circuits that supply power to an Origin
3900 system originate from the same distribution panel if possible. If not, they must
originate from the same source (transformer). Electrical work and installations must
comply with all applicable local, state, and national electrical codes.
SGI makes every effort to minimize the effects of power failures and interruptions to the
system hardware. Studies indicate that computer systems that are subjected to repeated
power interruptions and fluctuations experience higher component failure rates than
systems with stable power sources.
SGI encourages you to install a stable power source, such as an uninterruptible power
system (UPS), to minimize component failures.
Each Origin 3900 system and each piece of support equipment requires its own
customer-supplied receptacle. If you have difficulty obtaining the correct receptacles as
listed in Table 6-2, please contact your account manager.
Table 6-2 Electrical Specifications for the Origin 3900 Server
Electrical Service Specifications
Input Voltage:
Single-phase option
Three-phase options
180 to 254 VAC
180 to 254 VAC (North America/Japan) or
312 to 440 VAC (International)
Maximum Power Consumption:
Compute rack
Router rack
I/O rack
9.03 kVA (8.85 kW)
1.63 kVA (1.60 kW)
3.45 kVA (3.38 kW)
Hold-up Time 20 milliseconds
Total Harmonic Distortion (THD) Less than 10% THD-Rms at full load
Power Cable 8-ft (2.4-m) pluggable drop cord(s)