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      Memory module removal and installation - ThinkStation D20 (type 4155, 4158, 4218)

      Do not open your computer or attempt any repair before reading and understanding the "Important safety information" in the ThinkStation Safety and Warranty Guide that came with your computer.

      The memory module might be very hot. Turn off the computer and wait three to five minutes to let the computer cool before opening the computer cover.

      Your computer has 12 slots for installing or replacing DDR3 ECC UDIMMs (double data rate 3 error correction code unbuffered dual in-line memory modules) or DDR3 ECC RDIMMs (double data rate 3 error correction code registered dual in-line memory modules).

      When installing or replacing memory modules, use the following guidelines:

      • Use either DDR3 ECC UDIMMs or DDR3 ECC RDIMMs for your computer. Do not install both the UDIMMs and RDIMMs into the same computer.
      • Use 1 GB, 2 GB, or 4 GB UDIMMs in any combination up to a maximum of 48 GB.
      • Use 1 GB, 2 GB, 4 GB, or 8 GB RDIMMs in any combination up to a maximum of 96 GB.
      • Always install DIMMs in the numerical order printed on the system board (DIMM1, DIMM2, DIMM3, and so on). Install memory modules into the blue color memory slots first.
      • If your computer has only one CPU installed, be sure to install memory modules only in the memory slots adjacent to that CPU.
      • If your computer has two CPUs installed, install equal numbers of memory modules in both sets of CPU DIMM slots for maximum performance.

      To install or replace a memory module:

      1. Remove the computer cover. See "Cover removal".
      2. Lay the computer on its side.
      3. Locate the memory slots. See "Locating parts on the system board".
        Note: If it is the first time that the memory module being replaced, you might have to remove the blue shipping clip before removing the memory fan duct. If the computer is to be repackaged and shipped, the shipping clip must be reinstalled.
      4. For some computer models, you might need to remove the memory fan duct to access the memory slots. To remove the memory fan duct, remove the blue shipping clip, disconnect the memory fan cable from the system board, press inward on the two tabs, pivot the fan duct, and then disengage the other end of the duct.

      memory cooler

      1. Open the retaining clips as shown.

      retaining clips

      If you are replacing an old memory module, open the retaining clips and remove the memory module being replaced as shown.

      ram removal

      1. Position the new memory module over the memory slot. Make sure the notch (1) on the memory module aligns correctly with the slot key (2) on the system board. Push the memory module straight down into the slot until the retaining clips close.

      ram installation

      1. To install the memory fan, engage the rear of the duct with the retainer on the system board and then pivot the duct downwards until the duct snaps into position. Reconnect the memory fan cable to the system board.

      memory cooler installation

      1. Go to "Completing the FRU replacement".
        Note: Your system memory speed is determined by a number of factors, including the microprocessor model and the type, speed, size (capacity), and number of DIMMs installed.


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      • Alias ID: MIGR-72120
      • Document ID: PD013020
      • Last Updated :17 Jun 2014
      • © 2016 Lenovo