Compaq ProLiant DL380 Generation 2 Server High-Density Deployment in Compaq Racks

Compaq ProLiant DL380 Generation 2 Server High-Density Deployment in Compaq Racks 38
Compaq Confidential - Need to Know Required
14UH-0701A-WWEN
Appendix C – Power and Thermal
Budgeting
This appendix provides the information and worksheets necessary to calculate power and thermal
budgeting for your system. However, for the most accurate, updated power and thermal budgeting
calculations for your particular configuration, Compaq recommends using the online power
calculator. To use the calculator, visit the Compaq Active Answers website:
activeanswers.compaq.com/aaconfiguratorcode/configurationUi.asp?HTMLFilename=Country
Note: In this document, derating the input power budget means using less than the maximum
rated input power values for the power supply. Verify that the derated power budget satisfies
all the installation requirements including future upgrade plans.
Use either of the following methods to determine the lower input power requirement for
ProLiant DL380 Generation 2 servers:
• Use the derated input power. Calculate this value by using the supplied worksheet at the end
of this appendix.
• Use the allocated input power. Calculate this value by dividing the maximum power of a
PDU by the number of servers. This calculated power must be at least 421 W to support all
the optional components initially released with the ProLiant DL380 Generation 2 server.
Table 17 demonstrates how calculating the derated input power of the system can significantly
reduce input current and thermal dissipation.
Table 17. Derated Current and Thermal Dissipation for Reduced Input Power Assumptions
Input Power Derated Fully Rated
226 W 421 W 575 W
Input Current @115 VAC 2.0 A 3.8 A 6.4 A
Input Current @220 VAC 1.0 A 1.9 A 3.2 A
Thermal Dissipation 770 BTUs/hour 1435 BTUs/hour 1961 BTUs/hour
The derated input power values of 226 W and 421 W can be correlated with the measured input
power values for the minimum and maximum configurations of
ProLiant DL380 Generation 2 servers and optional components outlined in this paper. However,
the derated input power value must be high enough to account for any future upgrades.
Carefully derating the input power may satisfy deployment needs and reduce the number of PDUs
per rack.