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Chapter 20 Power System: Description/Calculating Power Usage
253
Server Current Usage
Table 20-3 shows the current usage for both minimally and fully configured servers. You can
easily calculate power usage in the server from the numbers provided. The table is for reference
only. It is not meant to provide the exact current usage in the server.
✏
NOTE
The current usage will vary depending on the number of processors, the
number of I/O card, the number of hard drives, and the size and number of
DIMMs on the memory modules installed in your server.
Table 20-3. Server Board Set Voltages and Currents
+3.3 V +5 V +12 V +5 V Standby -12 V
Min.
1
Current
Max.
2
Current
Min.
Current
Max.
Current
Min.
Current
Max.
Current
Min.
Current
Max.
Current
Min.
Current
Max.
Current
CPU baseboard with
processors
4.6 A 4.6 A 800 mA 6.2 A 0.2 A 28.5 A 0 A 0 A 0 A 0 A
Front panel
8
0 A 0 A 50mA 2.23A 3.1A 4.0A 100 mA 1.0A 1 mA 10 mA
Total (CPU
baseboard)
4.6 A 4.6 A 850 mA 8.4 A 3.3 A 32.5 A 100 mA 1.0 A 1 mA 10 mA
Total DRAM (8 GB) 2.4 A 27.2 A 0 A 0 A 0 A 0 A 0 A 0 A 0 A 0 A
PHP I/O baseboard 600 mA 5 A 600 mA 4.25 A 0 A 20 mA 5 mA 500 mA 0 A 0 A
PCI/ISA
3, 4, 5, 6, 7
0 A 23 A 0 A 35.68 A 0 A 5.0 A 0 A 0 A 0 A 1.0 A
I/O riser card 0 A 0 A 0 A 70 mA 0 A 30 mA 5 mA 150 mA 0 A 0 A
Total (I/O
baseboard)
600 mA
A
28 A 600 mA 40 A 0 A 5.05 A 10 mA 650 mA 0 A 1.0 A
Total Current
(DRAM, CPU and
I/O baseboards)
9.2 A 59.8 A 1.5 A 48.4 A 3.3 S 37.6 A 110 mA 1.7 A 1 mA 1.0 A
Total Power
(DRAM, CPU and
I/O baseboards)
304 W 197.3 W 7.5 W 242 W 39.6 W 451.2 W 0.55 W 8.5 W 0.01 W 12 W
1 Minimum server configuration: one idle processor, two VRMs, three processor termination modules, two memory
modules totaling 128 MB DRAM, no I/O adapter cards, front panel with system fans at low speed, I/O riser card, no
keyboard, no mouse, no video, no parallel-port connections, and no bus activity.
2 Maximum server configuration: four 65 W processors six VRMs operating at 80% efficiency, front panel with system
fans at high speed, I/O riser card, keyboard, mouse, video, parallel port connected, two memory modules with 8 GB
DRAM, and all I/O adapter slots filled. See notes 3-8. Maximized bus activity.
3 Current must not exceed 7.58 A (25 W) per PCI slot or 23 A total for all PCI expansion slots on +3.3 V.
4 Current must not exceed 5 A (25 W) per PCI slot or 35.68 A total for all expansion slots on +5 V.
5 Current must not exceed 2 A per ISA slot or 35.68 A total for all expansion slots on +5 V.
6 Current must not exceed 500 mA per PCI or ISA slot or 5 A total for all expansion slots on +12 V.
7 Current must not exceed 100 mA per slot or 1.0 A total for all expansion slots on -12 V.
8 These values are included for reference only. They are not included in the maximum configuration requirements.