HP ProLiant DL288 HP Power Regulator for ProLiant servers - Page 14

DL385 G5 Power Consumption vs. Load, Processor Utilization, Power Watts

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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 Power (Watts) DL385 G5 Power Consumption vs. Load 350 325 300 275 250 225 200 175 0 10 20 30 40 50 60 70 80 90 100 Processor Utilization (%) Static High Dynamic Static Low 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 Calculation Savings 35 W Cooling power saved* 1.5 x heat = 1.5 x 15 52.5 W Total power reduction 15 + 22.5 87.5 W Annual energy saved 0.0875 kW/hr x 24 hrs/day x 365 days 766.5 kWh Dollars saved (at 10 cents per kWh) 766.5 kWh * $0.10) $76.65 * 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. 14

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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
175
200
225
250
275
300
325
350
0
10
20
30
40
50
60
70
80
90
100
Processor Utilization (%)
Power (Watts)
Static High
Dynamic
Static Low
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)
Calculation
Savings
Power saved
35 W
Cooling power saved*
1.5 x heat = 1.5 x 15
52.5 W
Total power reduction
15 + 22.5
87.5 W
Annual energy saved
0.0875 kW/hr x 24
hrs/day x 365 days
766.5 kWh
Dollars saved (at 10 cents
per kWh)
766.5 kWh * $0.10)
$76.65
* 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.
14