Typical Uses For Power Regulator; Reducing Power And Cooling Cost - HP AB500A - Integrated Lights-Out Advanced Technology Brief

Figure 9. Lights Out display of Power Regulator processor states

Typical uses for Power Regulator

Power Regulator is adaptable to different environments. This section identifies three typical reasons for
using Power Regulator and the expected quantified results.

Reducing power and cooling cost

Power Regulator can be used to improve the server power use for typical client server applications
such as database, Exchange, file and print, web server, and OLTP.
Consider the effect of Power Regulator on an HP ProLiant DL385 G5 server running a database with
an average processor load of 50 percent. The application involved a mixture of cache, memory,
arithmetic, and floating point activities. The G5 system under test included two Quad-Core AMD
Opteron 2.30-GHz processors. In Static High Performance mode the processors ran at 2.3 GHz; in
Static Low Power mode they ran at 1.15 GHz.
Based on the test results displayed in Figure 10, the power reduction for the DL385 G5 server
configuration is 35 watts at an average 50 percent application load. Table 3 shows the estimated
cost savings of $76.65 per year on this system under 50 percent application load in Dynamic Power
Savings mode. Actual savings will vary depending on system configuration, processor utilization, and
electricity cost.
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