NOTE: 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 after the screw is seated. The screw tension should notbe more than 6 in-lb (6.9 kg-cm).6. Repeat the procedure for the remaining two screws.Figure 37. Installing the heat sink1. retention screw (4) 2. heat sink3. processor shield 4. retention screw slot (4)Next steps1. Follow the procedure listed in the After working inside your system section.2. While booting, press F2 to enter System Setup and verify that the processor information matches the new systemconfiguration.3. Run the system diagnostics to verify that the new processor operates correctly.Related linksSafety instructionsBefore working inside your systemInstalling a processorAfter working inside your systemPower supply unitsYour system supports two hot swappable 750 W or 1600 W AC power supply units (PSUs). If two PSUs are used, they must be ofthe same maximum output power.CAUTION: For AC PSUs, use only PSUs with the Extended Power Performance (EPP) label on the back. Mixing PSUsfrom previous generations of systems can result in a PSU mismatch condition or failure to turn on.NOTE: If a system with 1600 W PSUs operates from 100 V to 120 V, then the power rating per PSU is derated to 800 W.NOTE: When two identical PSUs are installed, power supply redundancy (1+1 – with redundancy or 2+0 – withoutredundancy) is configured in system BIOS. In redundant mode, power is supplied to the system equally from both PSUswhen Hot Spare is disabled. When Hot Spare is enabled, one of the PSUs will be put into standby when system utilizationis low to maximize efficiency.93
