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Chapter 4. Power supply
Component outputs
The power supply provides separate voltage sources for the system board and internal storage devices.
The following figures show the approximate power that is provided for specific system components. Many
components draw less current than the maximum shown.
Note: For each PCI connector, the maximum power consumption is rated at 10 watts for +5 V dc and
+3.3 V dc combined. Typical power budget assumptions use 7.5 watts per adapter. If maximum
power is used, then the overall system configuration will be limited in performance.
Figure 10. System board
Supply voltage Maximum current Regulation limits
+3.3 V DC 3000 mA +5.0% to −5.0%
+5.0 V DC 4000 mA +5.0% to −4.0%
+12.0 V DC 25.0 mA +5.0% to −5.0%
−12.0 V DC 25.0 mA +10.0% to −9.0%
Figure 11. Keyboard port
Supply voltage Maximum current Regulation limits
+5.0 V DC 275 mA +5.0% to −4.0%
Figure 12. Auxiliary device port
Supply voltage Maximum current Regulation limits
+5.0 V DC 300 mA +5.0% to −4.0%
Figure 13. PCI-bus adapters (Per Slot) either/or
Supply voltage Maximum current Regulation limits
+5.0 V dc 2000 mA +5.0% to −4.0%
+3.3 V dc 3030 mA +5.0% to −4.0%
Figure 14. USB port
Supply voltage Maximum current Regulation limits
+5.0 V DC 500 mA +5.0% to −4.0%
Figure 15. Internal DASD
Supply voltage Maximum current Regulation limits
+5.0 V DC 1400 mA +5.0% to −5.0%
+12.0 V DC 1500 mA at startup, 400 mA when
active
+5.0% to −5.0%
Figure 16. Video port pin 9
Supply voltage Maximum current Regulation limits
+5.0 V DC 1100mA +5.0% to − 5.0%
18 Technical Information Manual