The high RPM fan starts to keep the system below 65 degrees Celsius and to catch peak loads. The fan has 2 speeds and automatically adjusts speed based on the temperature, CPU throttling and power reduction.
Users may report that the hard drive in the system are not being detected in the BIOS on the Optiplex 790 and 990 systems. Draining flea power on the affected systems and turning them back on may allow the drives to be detected correctly in the BIOS. The hard drives affected by this issue are:
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