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Additional Information
This section provides information for the additional features that are part of your computer.
Memory Module Guidelines
To ensure optimal performance of your computer, observe the following general guidelines when
configuring your system memory:
• Memory modules of different sizes can be mixed (for example, 2 GB and 4 GB). But, all populated
channels must have identical configurations.
• Memory modules must be installed beginning with the first socket.
NOTE: Registered DIMMS (R-DIMMs) and Load Reduced DIMMS (LR-DIMMs) cannot be mixed.
• If memory modules with different speeds are installed, they operate at the speed of the slowest
installed memory modules.
NOTE: If all DIMMs are 2133, the CPU ordered may run the memory at a slower speed.
Power Supply Unit (PSU) Lock
The PSU lock prevents the removal of the PSU from the chassis.
NOTE: To lock or unlock the PSU, always ensure that the cover of the chassis is removed.
To secure the PSU, remove the screw from the unlock screw location and tighten the screw to the lock
location. Similarly, to unlock the PSU, remove the screw from the lock screw location and tighten the
screw to the unlock screw location.
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