HP AB500A - Integrated Lights-Out Advanced Technology Brief page 14

Figure 10. Effective power consumption of Static High Performance, Dynamic Power Savings, and Static Low
Power modes on a DL385 G5 server at various system loads
DL385 G5 Power Consumption vs. Load
350
325
300
275
250
225
200
175
0 10 20
Table 3. Calculated annual power cost savings for an HP ProLiant DL385 G5 server running a database with an
average processor load of 50 percent
Parameter
(at 50% load reduction)
Power saved
Cooling power saved*
Total power reduction
Annual energy saved
Dollars saved (at 10 cents
per kWh)
* Calculation based on the Uptime Institute averaging cooling factor of 1.5. For more information,
visit the Uptime Institute website at www.upsite.com/TUIpages/tuihome.html.
Since the results above are based on average application and processor load, the $76.65 cost
savings would be realized in either Static Low Power or Dynamic Power Savings mode for an
average utilization of 50 percent. The savings should scale linearly with the number of servers,
resulting in significant savings for large data center operations. As average utilization decreases, the
potential savings will increase.
30 40 50 60
Processor Utilization (%)
Calculation
1.5 x heat = 1.5 x 15
15 + 22.5
0.0875 kW/hr x 24
hrs/day x 365 days
766.5 kWh * $0.10)
70 80 90 100
Savings
35 W
52.5 W
87.5 W
766.5 kWh
$76.65
Static High
Dynamic
Static Low
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