HP Integrity rx7620 Site Preparation Guide, Fourth Editon - HP Integrity rx762 - Page 38

System Specifications Environmental Specifications PCI/Mass Storage Section Cooling Six 92 mm fans located between the mass storage devices and the PCI card cage provide airflow through these devices. The PCI fans are powered with housekeeping power and run at full speed at all times. The air is pulled through the mass storage devices and pushed through the PCI Card Cage. Perforation is provided between the PCI bulkheads to allow adequate exhaust ventilation and to help reduce the localized airflow dead spots that typically occur at the faceplate tail of each PCI card. Standby Cooling Several components within the chassis consume significant amounts of power while the system is in standby mode. The system fans run at 1541 rpm, or 38% of full speed, during standby to remove the resulting heat from the cabinet. The fans within the power supply will operate at full speed during standby. Typical Power Dissipation and Cooling Table A-5 Typical HP Integrity rx7620 Server Configurations Cell Boards Memory Per Cell Board PCI Cards (assumes 10 watts each) DVDs Hard Disk Drives Core I/O Bulk Power Supplies Typical Power Typical Cooling Qty 2 2 2 1 GBytes Qty 16 16 8 8 4 8 4 8 Qty 2 0 0 0 Qty 4 2 2 1 Qty 2 2 2 1 Qty 2 2 2 2 Watts 2030 1733 1678 1047 BTU/hr 6930.42 5916.46 5728.69 3574.46 The air conditioning data is derived using the following equations. • Watts x (0.860) = kcal/hour • Watts x (3.414) = Btu/hour • Btu/hour divided by 12,000 = tons of refrigeration required NOTE When determining power requirements you must consider any peripheral equipment that will be installed during initial installation or as a later update. Refer to the applicable documentation for such devices to determine the power and air-conditioning that is required to support these devices. Acoustic Noise Specification The acoustic noise specification for the HP Integrity rx7620 Server is 57.3 db (sound pressure level at bystander position) It is appropriate for dedicated computer room environments but not office environments. The LwA is 7.5 Bels. Be sure to understand the acoustic noise specifications relative to operator positions within the computer room or when adding servers to computer rooms with existing noise sources. 24 Appendix A