The IBM/Lenovo eServer i5 550 (9406-550) uses DDR DIMM ECC PC2100 266MHz 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 DDR DIMM ECC PC2100 266MHz
Base Memory 1GB (Removable) or 2GB (Removable)
Upgrade Slots 2 Slots for processor cards 8 Sockets (2 banks of 4) per processor card
Maximum Memory 32GB per processor card 64GB with two processor cards
Maximum Module Size 16GB
CPU & Chipset IBM POWER5
Bus Architecture ~
Manufacturer Part Numbers
  • 9406-550
Part Number 31.1EC3
266MHz 184pin CL3 ECC
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$30.99
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Part Number 31.2EC3
266MHz 184pin CL3 ECC
Call to Order
$34.99
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Part Number 311EC3
266MHz 184pin CL3 ECC
In Stock
$38.99
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Part Number 31.5EC3
266MHz 184pin CL3 ECC
Call to Order
$40.99
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Part Number 312EC3
266MHz 184pin CL3 ECC
Call to Order
$46.99
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Part Number 31.1EC3H
266MHz 184pin CL3 ECC
Call to Order
$49.99
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Part Number 31.2EC3H
266MHz 184pin CL3 ECC
Call to Order
$54.99
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Part Number 311EC3H
266MHz 184pin CL3 ECC
In Stock
$62.99
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Part Number 31.5EC3H
266MHz 184pin CL3 ECC
Call to Order
$64.99
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Part Number 31.2EC3-2
266MHz 184pin CL3 ECC
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$68.99
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Part Number 312EC3H
266MHz 184pin CL3 ECC
Call to Order
$74.99
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Part Number 311EC3-2
266MHz 184pin CL3 ECC
In Stock
$77.99
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Part Number 31.5EC3-2
266MHz 184pin CL3 ECC
Call to Order
$80.99
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Part Number 31.2EC3-2H
266MHz 184pin CL3 ECC
Call to Order
$109.99
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Part Number 311EC3-2H
266MHz 184pin CL3 ECC
In Stock
$124.99
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Part Number 31.5EC3-2H
266MHz 184pin CL3 ECC
Call to Order
$129.99
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Part Number 312EC3
266MHz 184pin CL3 ECC
Call to Order
$46.99
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Part Number 312EC3H
266MHz 184pin CL3 ECC
Call to Order
$74.99
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Part Number 311EC3-2
266MHz 184pin CL3 ECC
In Stock
$77.99
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Part Number 311EC3-2H
266MHz 184pin CL3 ECC
In Stock
$124.99
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Part Number 311EC3
266MHz 184pin CL3 ECC
In Stock
$38.99
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Part Number 311EC3H
266MHz 184pin CL3 ECC
In Stock
$62.99
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Part Number 31.5EC3-2
266MHz 184pin CL3 ECC
Call to Order
$80.99
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Part Number 31.5EC3-2H
266MHz 184pin CL3 ECC
Call to Order
$129.99
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Part Number 31.5EC3
266MHz 184pin CL3 ECC
Call to Order
$40.99
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Part Number 31.5EC3H
266MHz 184pin CL3 ECC
Call to Order
$64.99
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Part Number 31.2EC3-2
266MHz 184pin CL3 ECC
Call to Order
$68.99
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Part Number 31.2EC3-2H
266MHz 184pin CL3 ECC
Call to Order
$109.99
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Part Number 31.2EC3
266MHz 184pin CL3 ECC
Call to Order
$34.99
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Part Number 31.2EC3H
266MHz 184pin CL3 ECC
Call to Order
$54.99
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Part Number 31.1EC3
266MHz 184pin CL3 ECC
Call to Order
$30.99
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Part Number 31.1EC3H
266MHz 184pin CL3 ECC
Call to Order
$49.99
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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-P615/2G 2GB Kit of 4 512MB DDR PC2100 266MHz ECC DIMM Kingston 31.5EC3-4
KTM-P615/4G 4GB Kit of 2 2GB DDR PC2100 266MHz ECC REG 208pin DIMM Kingston OP322ERC2/5-2
KTM-P615/8G 8GB Kit of 4 2GB DDR PC2100 266MHz 208pin DIMM Kingston OP322-4
KTM-P615/16G 16GB Kit of 4 4GB DDR PC2100 266MHz ECC REG 208pin DIMM Kingston OP324ER-4