Lenovo ThinkPad T420si (English) User Guide - Page 110
If the two SO-DIMMs are already in the memory slots, remove an SO-DIMM to make room for
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Note: The operating speed of the memory module depends on the system configuration of your computer and its combination with the memory module installed on your computer. In some conditions, the memory in your computer may not be able to operate at the maximum speed. Attention: Before you start installing a module, touch a metal table or a grounded metal object. This action reduces any static electricity from your body. The static electricity could damage the SO-DIMM. To replace the SO-DIMM, do the following: 1. Turn off the computer; then disconnect the ac power adapter and all cables from the computer. 2. Close the computer display, and turn it over. 3. Remove the battery. Refer to "Replacing the battery" on page 97 for details about how to replacing the battery. 4. Loosen the screws on the memory slot cover (1), then remove the cover (2). If the two SO-DIMMs are already in the memory slots, remove an SO-DIMM to make room for the new one by pressing out on the latches on both edges of the socket at the same time (1). Be sure to save it for future use (2). 5. Find the notch on the contact edge side of the SO-DIMM you are installing. Attention: To avoid damaging the SO-DIMM, do not touch its contact edge. 94 User Guide