The IBM/Lenovo ThinkCentre A51 9212-xxx uses DDR2 DIMM PC2-4200 533MHz, PC2-3200 400MHz 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 DIMM PC2-4200 533MHz, PC2-3200 400MHz
Base Memory 256 MB (Removable) or 512 MB (Removable)
Upgrade Slots 4 Sockets
Maximum Memory 3 GB
Maximum Module Size
CPU & Chipset Intel Pentium 4 Intel 915G Intel Pentium 4 Intel 915GV Intel Celeron D Intel 915G Intel Celeron D Intel 915GV
Bus Architecture PCI; PCI Express
Notes MODULES MAY BE INSTALLED ONE AT A TIME; however, they must be added in like pairs to take advantage of dual channel mode. The BIOS addresses 4GB maximum, however, the system will only utilize 3GB.
Manufacturer Part Numbers
  • 9212-xxx
Part Number 511C7
400MHz 240pin CL7
In Stock
$7.99
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Part Number 521C7
533MHz 240pin CL7
In Stock
$7.99
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Part Number 511C7H
400MHz 240pin CL7
In Stock
$12.99
View Product
Part Number 521C7H
533MHz 240pin CL7
In Stock
$12.99
View Product
Part Number 511C7
400MHz 240pin CL7
In Stock
$7.99
View Product
Part Number 521C7
533MHz 240pin CL7
In Stock
$7.99
View Product
Part Number 511C7H
400MHz 240pin CL7
In Stock
$12.99
View Product
Part Number 521C7H
533MHz 240pin CL7
In Stock
$12.99
View Product

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
KTM3211/1G 1GB DDR2 PC2-4200 533MHz DIMM Kingston 521C7
KTM3219/1G 1GB DDR2 PC2-3200 400MHz DIMM Kingston 511C7