Dell PowerEdge R940 - Page 27

• iDRAC9 BIOS settings: Performance Per Watt (DAPC or OS) may be quieter than Performance or Dense Conguration (iDRAC
Settings > Thermal > Max. Exhaust Temperature or Fan speed oset).
• The quantity and type of PCIe cards installed: This aects overall system acoustics. Installation of more than two PCIe cards
results in an increase in overall system acoustics.
• PCIe controller-based SSD drives: Drives such as Express ash drives and Fusion- IO cards require greater airow for cooling,
and result in signicantly higher noise levels.
• Systems with an H330 PERC: This conguration may be quieter than those with an H730P PERC with battery backup.
However, higher noise levels result when a system is congured as non-RAID.
• Hot spare feature of power supply unit: In the system default setting, the Hot Spare Feature is disabled; acoustical output from
the power supplies is lowest in this setting.
Power, thermal, and acoustics 27