Chapter 20 Power System: Description/Calculating Power Usage
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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 panel80 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/ISA3, 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 Mi ni m um server c onf i guration: one idl e proc essor, t wo V RM s, three proc essor termi nation modules , two memory
modules t otaling 128 MB DRAM, no I/ O adapt er cards, f ront panel with system fans at low speed, I/O ri ser card, no
keyboard, no m ouse, no video, no parallel-port connections, and no bus ac t i vity .
2 Maximum s erver configuration: four 65 W processors six VRM s operating at 80% effici ency, f ront panel wi th system
fans at hi gh speed, I/ O ri ser card, k eyboard, mous e, video, parallel port connect ed, two memory m odul es with 8 GB
DRAM, and all I/ O adapter slots filled. See notes 3-8. Maximized bus activ i t y.
3 Current m ust not ex c eed 7.58 A (25 W) per PCI slot or 23 A total for al l P CI expansion slots on +3.3 V.
4 Current m ust not ex c eed 5 A (25 W) per PCI sl ot or 35.68 A t ot al for all expans i on slots on +5 V.
5 Current m ust not ex c eed 2 A per ISA slot or 35.68 A total for all expans i on slots on +5 V.
6 Current m ust not ex c eed 500 mA per PCI or I SA slot or 5 A total for all expans i on slots on +12 V.
7 Current m ust not ex c eed 100 mA per slot or 1.0 A tot al f or al l expansion s l ot s on -12 V.
8 Thes e values are inc l uded for reference only. They are not i ncluded in the maximum c onfiguration requirem ents.