Dell Precision Rack 7910 Dell Precision Rack 7910 Owners Manual - Page 81
Power supply units, Hot Spare feature, with power supply redundancy.
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NOTE: Tighten the screws diagonally opposite to each other. Do not over-tighten the heat sink retention screws when installing the heat sink. To prevent over-tightening, tighten the retention screw until resistance is felt, and stop once the screw is seated. The screw tension should be no more than 6 in-lb (6.9 kg-cm). 1. Install the cooling shroud. 2. If applicable, install the PCIe card. 3. If applicable, install the cooling fan assembly. 4. Follow the procedure listed in After working inside your system. 5. While booting, press to enter the System Setup and check that the processor information matches the new system configuration. 6. Run the system diagnostics to verify that the new processor operates correctly. Power supply units Your system supports: • Two 1100 W AC power supply modules NOTE: Titanium power supply unit is nominally rated for 200 VAC to 240 VAC input only. NOTE: When two identical power supplies are installed, power supply redundancy (1+1 - with redundancy or 2+0 - without redundancy) is configured in system BIOS. In redundant mode, power is supplied to the system equally from both power supplies when Hot Spare is disabled. When Hot Spare is enabled, one of the PSUs will be put into standby when system utilization is low in order to maximize efficiency. NOTE: For AC power supply units, use only power supply units with the Extended Power Performance (EPP) label on the back. Mixing power supply units from previous generations of servers can result in a power supply unit mismatch condition or failure to power on. Hot Spare feature Your system supports the Hot Spare feature that significantly reduces the power overhead associated with power supply redundancy. When the Hot Spare feature is enabled, one of the redundant power supplies is switched to a sleep state. The active power supply supports 100% of the load, thus operating at higher efficiency. The power supply in the sleep state monitors output voltage of the active power supply. If the output voltage of the active power supply drops, the power supply in the sleep state returns to an active output state. If having both power supplies active is more efficient than having one power supply in a sleep state, the active power supply can also activate a sleeping power supply. The default power supply settings are as follows: • If the load on the active power supply is more than 50%, then the redundant power supply is switched to the active state. • If the load on the active power supply falls below 20%, then the redundant power supply is switched to the sleep state 81