HP ProLiant BL660c HP Power Regulator for ProLiant servers - Page 10

Dynamic Power Savings mode the most efficient overall power consumption and performance characteristics. The difference in processor performance (as measured by computational throughput) is negligible between the Static High mode and Dynamic Savings mode. The application workload used in Figures 2 and 3 changed slowly enough over time that it favored the slow response time setting of Dynamic Power Saving mode. Dynamic Power Savings mode (fast response) is less power-efficient than slow response for application such as these but produces lower latency. Note that Dynamic Power Savings mode response times (both slow and fast) give you the ability to trade off levels of efficiency and latency relative to application workloads that may be more latency-sensitive. Reducing power and cooling cost Power Regulator is a valuable tool to improve server power use for typical client-server applications such as database, email, file and print, web server, and online transaction processing. Figure 4 shows the effect of Power Regulator on a DL380 G7server running a workload comparable to the SPECpower_ssj2008 benchmark. The G7 system used in this test included two Quad-core Intel Xeon 5670 2.93-GHz processors with four 4 GB UDIMMs and a 60 GB SSD. The processors ran at 2.93 GHz in Static High Performance mode. The processor speed ranged from 1.6 to 2.93 GHz in Dynamic Power Savings mode. Based on the test results shown in Figure 4, the power reduction for the DL380 G7 server configuration is 16 watts at a 60% application load. 10