The IBM/Lenovo ThinkPad X41 Tablet 1866, 1867, 1869-xxx uses DDR2 SODIMM PC2-4200 533MHz, PC2-5300 667MHz memory upgrades as listed in the detailed specifications below. All memory and other upgrades compatible with this system are listed on this page.

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Memory Type DDR2 SODIMM PC2-4200 533MHz, PC2-5300 667MHz
Base Memory 256 MB (Non-removable) or 512 MB (Non-removable)
Upgrade Slots 1 Socket(s)
Maximum Memory 1.28 GB or 1.5 GB
Maximum Module Size
CPU & Chipset Intel Pentium M Intel 915GM
Bus Architecture PC Card
Manufacturer Part Numbers
  • 1866-xxx
  • 1867-xxx
  • 1869-xxx
Part Number 621C6
533MHz 200pin CL6
In Stock
$7.99
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Part Number 631C5
667MHz 200pin CL5
In Stock
$7.99
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Part Number 621C6H
533MHz 200pin CL6
In Stock
$12.99
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Part Number 631C5H
667MHz 200pin CL5
In Stock
$12.99
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Part Number 621C6
533MHz 200pin CL6
In Stock
$7.99
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Part Number 631C5
667MHz 200pin CL5
In Stock
$7.99
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Part Number 621C6H
533MHz 200pin CL6
In Stock
$12.99
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Part Number 631C5H
667MHz 200pin CL5
In Stock
$12.99
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Upgrade References

The table below are references to other manufacturer part numbers which are specific to this device, have identical specifications to our components. This information is made available for your reference.
Part# Source References
KTM-TP3840/1G 1GB DDR2 PC2-4200 533MHz SODIMM Kingston 621C6
CT550382 1GB DDR2 PC2-5300 667MHz SODIMM Crucial 631C5