Lenovo ThinkPad 770E-ED TP 770X User's Reference that shipped with the system - Page 72

Removing the DIMM, and all cables from the computer.

Page 72 highlights

Increasing Memory How to Calculate Total Memory Size Calculate your total memory size in kilobytes (KB) by adding the DIMM memory size to the base memory size (32192 KB). For example, if you installed a 32-MB DIMM into your computer with 64-MB base memory, you should have about 96 MB. Your computer might display memory size in kilobytes. For example, 96 MB=97728 KB. Note: 576 KB is reserved by the system. Removing the DIMM 1 Power off the computer and disconnect the AC Adapter and all cables from the computer. 2 Remove the battery pack. 3 Close the LCD, and turn the computer over. 4 Loosen the screw and remove the memory slot cover. 58 IBM ThinkPad 770X User's Reference

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Increasing Memory
How to Calculate Total Memory Size
Calculate your total memory size in kilobytes (KB) by adding the
DIMM memory size to the base memory size (32192 KB).
For example, if you installed a 32-MB DIMM into your computer
with 64-MB base memory, you should have about 96 MB.
Your computer might display memory size in kilobytes.
For
example, 96 MB=97728 KB.
Note:
576 KB is reserved by the system.
Removing the DIMM
1
Power off the computer and disconnect the AC Adapter
and all cables from the computer.
2
Remove the battery pack.
3
Close the LCD, and turn the computer over.
4
Loosen the screw and remove the memory slot cover.
58
IBM ThinkPad 770X User's Reference