T40, T40p, T41, T41p, T42, T42p, T43, T43p Memory Upgrade

Need to remove,add or upgrade memory for your Thinkpad? These procedures describe removing and installing memory modules for the various type of T4x.

Following is the memory configuration:
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T40, T40p -- PC2100 DDR SDRAM 266MHZ 2GB maximum. 2 200-pin sockets
T41, T41p -- PC2700 DDR SDRAM 333MHZ 2GB maximum 2 200-pin sockets
T42, T42p
T43, T43p -- PC2-4200 CL4 SDRAM 533MHZ 2GB maximum 2 200-pin sockets

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This model of Thinkpad has two memory slots; one accessed on the back of the machine and the other under the keyboard.
- Turn off the computer and disconnect the AC adapter.
- Close display and turn the laptop over.
- Remove the battery.
- Loosen the screw that holds the memory cover; then remove the cover.
- The memory cover is located below the battery slot on the back of the laptop.
- Install the new memory into the socket at an angle then press downward until it snaps into place.
- Replace memory cover and re-tighten the screw.

To access memory under the keyboard:
Follow keyboard removal process: Keyboard Removal then return here for instructions on adding memory.

- Install memory into the slot at an angle and press it into place.
- Reverse the steps to install the keyboard and re-tighten the screws on the back of the machine.
-Check that the laptop recognizes the additional memory by pressing F1 to enter the BIOS right after turning on the laptop.