The IBM/Lenovo System x3550 M3 7944 uses DDR3 DIMM ECC REG PC3-8500 1066MHz, ECC REG PC3-10600 1333MHz, ECC PC3-10600 1333MHz 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 DDR3 DIMM ECC REG PC3-8500 1066MHz, ECC REG PC3-10600 1333MHz, ECC PC3-10600 1333MHz
Base Memory 2GB (Removable) or 4GB (Removable) or 8GB (Removable)
Upgrade Slots 18 Socket(s) maximum using RDIMMs 12 Socket(s) maximum using UDIMMs or QR RDIMMs
Maximum Memory 48GB ECC UDIMM 288GB Reg ECC RDIMM
Maximum Module Size
CPU & Chipset Intel Xeon / Intel 5520
Bus Architecture PCI Express; PCI-X; SSD - SATA 2.5-inch 9.5mm
Notes Important: Quantum's DDR3-1333 modules automatically clock down to 1066MHz and 800MHz depending on which Intel Xeon model is installed and how many module banks are populated. Due to chipset limitations, DDR3 Quad Rank memory is limited to operate at a maximum of 1066MHz. When two Quad Rank modules are installed per bank, the processor will automatically clock them down to 800MHz. System only supports (6) Quad Rank DIMMs per CPU or (12) Quad Rank DIMMs with two CPUs. 4GB DDR3-1333 Reg ECC modules come in two versions: 313/4G using x4 and 3138/4G using x8 DRAM. The two parts may be installed in the same system but not within the same memory bank. Use like modules for dual and triple channel operation.
Manufacturer Part Numbers
  • 7944-xxx
Part Number 821EC9
1333MHz 240pin CL9 ECC
In Stock
$18.99
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Part Number 822EC9
1333MHz 240pin CL9 ECC
In Stock
$26.99
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Part Number 821EC9H
1333MHz 240pin CL9 ECC
In Stock
$29.99
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Part Number 824ERTC9
1333MHz 240pin CL9 Registered Thermal Sensor ECC
In Stock
$30.99
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Part Number 828ERTC9
1333MHz 240pin CL9 Registered Thermal Sensor ECC
In Stock
$35.99
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Part Number 834ERTC9
1600MHz 240pin CL9 Registered Thermal Sensor ECC
In Stock
$37.99
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Part Number 822ERTC9
1333MHz 240pin CL9 Registered Thermal Sensor ECC
In Stock
$40.99
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Part Number 824ERLVTC9
1333MHz 240pin CL9 Registered Low Power Thermal Sensor ECC
In Stock
$41.99
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Part Number 822EC9H
1333MHz 240pin CL9 ECC
In Stock
$42.99
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Part Number 824EC9
1333MHz 240pin CL9 ECC
In Stock
$46.99
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Part Number 834EC9
1600MHz 240pin CL9 ECC
In Stock
$46.99
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Part Number 838ERTC9
1600MHz 240pin CL9 Registered Thermal Sensor ECC
In Stock
$46.99
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Part Number 822ERSTC9
1333MHz 240pin CL9 Registered Single Rank Thermal Sensor ECC
In Stock
$48.99
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Part Number 824ERTC9H
1333MHz 240pin CL9 Registered Thermal Sensor ECC
In Stock
$49.99
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Part Number 828ERTC9H
1333MHz 240pin CL9 Registered Thermal Sensor ECC
In Stock
$57.99
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Part Number 834ERTC9H
1600MHz 240pin CL9 Registered Thermal Sensor ECC
In Stock
$59.99
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Part Number 828ERLVTC9
1333MHz 240pin CL9 Registered Low Power Thermal Sensor ECC
In Stock
$61.99
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Part Number 822ERTC9H
1333MHz 240pin CL9 Registered Thermal Sensor ECC
In Stock
$64.99
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Part Number 824ERLVTC9H
1333MHz 240pin CL9 Registered Low Power Thermal Sensor ECC
In Stock
$67.99
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Part Number 824EC9H
1333MHz 240pin CL9 ECC
In Stock
$74.99
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Part Number 834EC9H
1600MHz 240pin CL9 ECC
In Stock
$74.99
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Part Number 838ERTC9H
1600MHz 240pin CL9 Registered Thermal Sensor ECC
In Stock
$74.99
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Part Number 822ERSTC9H
1333MHz 240pin CL9 Registered Single Rank Thermal Sensor ECC
In Stock
$77.99
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Part Number 822ERLVTC9
1333MHz 240pin CL9 Registered Low Power Thermal Sensor ECC
In Stock
$85.99
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Part Number 824ERTC9-3
1333MHz 240pin CL9 Registered Thermal Sensor ECC
In Stock
$92.99
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Part Number SSD/60G
Call to Order
$92.99
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Part Number 828ERLVTC9H
1333MHz 240pin CL9 Registered Low Power Thermal Sensor ECC
In Stock
$99.99
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Part Number SSD/64G
Call to Order
$99.99
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Part Number 828ERTC9-3
1333MHz 240pin CL9 Registered Thermal Sensor ECC
In Stock
$106.99
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Part Number 8216ERLVQTC9
1333MHz 240pin CL9 Registered Low Power Quad Rank Thermal Sensor ECC
In Stock
$108.99
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Part Number 8216ERLVTC9
1333MHz 240pin CL9 Registered Low Power Thermal Sensor ECC
In Stock
$108.99
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Part Number SSD/80G
Call to Order
$123.99
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Part Number 822ERLVTC9H
1333MHz 240pin CL9 Registered Low Power Thermal Sensor ECC
In Stock
$137.99
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Part Number 824ERSTC9-3
1333MHz 240pin CL9 Registered Single Rank Thermal Sensor ECC
In Stock
$139.99
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Part Number SSD/32G
Call to Order
$139.99
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Part Number SSD/96G
Call to Order
$148.99
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Part Number 824ERTC9-3H
1333MHz 240pin CL9 Registered Thermal Sensor ECC
In Stock
$149.99
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Part Number SSD/60GH
Call to Order
$149.99
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Part Number SSD/64GH
Call to Order
$159.99
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Part Number 828ERTC9-3H
1333MHz 240pin CL9 Registered Thermal Sensor ECC
In Stock
$172.99
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Part Number 8216ERLVQTC9H
1333MHz 240pin CL9 Registered Low Power Quad Rank Thermal Sensor ECC
In Stock
$174.99
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Part Number 8216ERLVTC9H
1333MHz 240pin CL9 Registered Low Power Thermal Sensor ECC
In Stock
$174.99
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Part Number SSD/80GH
Call to Order
$199.99
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Part Number 8116ERQTC9
1066MHz 240pin CL9 Registered Quad Rank Thermal Sensor ECC
In Stock
$201.99
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Part Number 824ERSTC9-3H
1333MHz 240pin CL9 Registered Single Rank Thermal Sensor ECC
In Stock
$224.99
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Part Number SSD/32GH
Call to Order
$224.99
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Part Number SSD/96GH
Call to Order
$239.99
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Part Number SSD/128G
Call to Order
$263.99
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Part Number 8116ERQTC9H
1066MHz 240pin CL9 Registered Quad Rank Thermal Sensor ECC
In Stock
$324.99
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Part Number SSD/240G
Call to Order
$371.99
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Part Number SSD/256G
Call to Order
$402.99
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Part Number SSD/128GH
Call to Order
$424.99
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Part Number SSD/240GH
Call to Order
$599.99
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Part Number SSD/400G
Call to Order
$619.99
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Part Number SSD/256GH
Call to Order
$649.99
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Part Number SSD/512G
Call to Order
$929.99
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Part Number SSD/400GH
Call to Order
$999.99
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Part Number SSD/512GH
Call to Order
$1499.99
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Part Number 828ERTC9-3
1333MHz 240pin CL9 Registered Thermal Sensor ECC
In Stock
$106.99
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Part Number 828ERTC9-3H
1333MHz 240pin CL9 Registered Thermal Sensor ECC
In Stock
$172.99
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Part Number 8216ERLVQTC9
1333MHz 240pin CL9 Registered Low Power Quad Rank Thermal Sensor ECC
In Stock
$108.99
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Part Number 8216ERLVTC9
1333MHz 240pin CL9 Registered Low Power Thermal Sensor ECC
In Stock
$108.99
View Product
Part Number 8216ERLVQTC9H
1333MHz 240pin CL9 Registered Low Power Quad Rank Thermal Sensor ECC
In Stock
$174.99
View Product
Part Number 8216ERLVTC9H
1333MHz 240pin CL9 Registered Low Power Thermal Sensor ECC
In Stock
$174.99
View Product
Part Number 8116ERQTC9
1066MHz 240pin CL9 Registered Quad Rank Thermal Sensor ECC
In Stock
$201.99
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Part Number 8116ERQTC9H
1066MHz 240pin CL9 Registered Quad Rank Thermal Sensor ECC
In Stock
$324.99
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Part Number 824ERTC9-3
1333MHz 240pin CL9 Registered Thermal Sensor ECC
In Stock
$92.99
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Part Number 824ERSTC9-3
1333MHz 240pin CL9 Registered Single Rank Thermal Sensor ECC
In Stock
$139.99
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Part Number 824ERTC9-3H
1333MHz 240pin CL9 Registered Thermal Sensor ECC
In Stock
$149.99
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Part Number 824ERSTC9-3H
1333MHz 240pin CL9 Registered Single Rank Thermal Sensor ECC
In Stock
$224.99
View Product
Part Number 828ERTC9
1333MHz 240pin CL9 Registered Thermal Sensor ECC
In Stock
$35.99
View Product
Part Number 838ERTC9
1600MHz 240pin CL9 Registered Thermal Sensor ECC
In Stock
$46.99
View Product
Part Number 828ERTC9H
1333MHz 240pin CL9 Registered Thermal Sensor ECC
In Stock
$57.99
View Product
Part Number 828ERLVTC9
1333MHz 240pin CL9 Registered Low Power Thermal Sensor ECC
In Stock
$61.99
View Product
Part Number 838ERTC9H
1600MHz 240pin CL9 Registered Thermal Sensor ECC
In Stock
$74.99
View Product
Part Number 828ERLVTC9H
1333MHz 240pin CL9 Registered Low Power Thermal Sensor ECC
In Stock
$99.99
View Product
Part Number 824ERTC9
1333MHz 240pin CL9 Registered Thermal Sensor ECC
In Stock
$30.99
View Product
Part Number 834ERTC9
1600MHz 240pin CL9 Registered Thermal Sensor ECC
In Stock
$37.99
View Product
Part Number 824ERLVTC9
1333MHz 240pin CL9 Registered Low Power Thermal Sensor ECC
In Stock
$41.99
View Product
Part Number 824EC9
1333MHz 240pin CL9 ECC
In Stock
$46.99
View Product
Part Number 834EC9
1600MHz 240pin CL9 ECC
In Stock
$46.99
View Product
Part Number 824ERTC9H
1333MHz 240pin CL9 Registered Thermal Sensor ECC
In Stock
$49.99
View Product
Part Number 834ERTC9H
1600MHz 240pin CL9 Registered Thermal Sensor ECC
In Stock
$59.99
View Product
Part Number 824ERLVTC9H
1333MHz 240pin CL9 Registered Low Power Thermal Sensor ECC
In Stock
$67.99
View Product
Part Number 824EC9H
1333MHz 240pin CL9 ECC
In Stock
$74.99
View Product
Part Number 834EC9H
1600MHz 240pin CL9 ECC
In Stock
$74.99
View Product
Part Number 822EC9
1333MHz 240pin CL9 ECC
In Stock
$26.99
View Product
Part Number 822ERTC9
1333MHz 240pin CL9 Registered Thermal Sensor ECC
In Stock
$40.99
View Product
Part Number 822EC9H
1333MHz 240pin CL9 ECC
In Stock
$42.99
View Product
Part Number 822ERSTC9
1333MHz 240pin CL9 Registered Single Rank Thermal Sensor ECC
In Stock
$48.99
View Product
Part Number 822ERTC9H
1333MHz 240pin CL9 Registered Thermal Sensor ECC
In Stock
$64.99
View Product
Part Number 822ERSTC9H
1333MHz 240pin CL9 Registered Single Rank Thermal Sensor ECC
In Stock
$77.99
View Product
Part Number 822ERLVTC9
1333MHz 240pin CL9 Registered Low Power Thermal Sensor ECC
In Stock
$85.99
View Product
Part Number 822ERLVTC9H
1333MHz 240pin CL9 Registered Low Power Thermal Sensor ECC
In Stock
$137.99
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Part Number 821EC9
1333MHz 240pin CL9 ECC
In Stock
$18.99
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Part Number 821EC9H
1333MHz 240pin CL9 ECC
In Stock
$29.99
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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-SX310Q/16G 16GB DDR3 PC3-8500 1066MHz ECC REG Quad Rank Thermal Sensor DIMM Kingston 8116ERQTC9
KTM-SX313/2G 2GB DDR3 PC3-10600 1333MHz ECC REG Thermal Sensor DIMM Kingston 822ERTC9
KTM-SX313/4G 4GB DDR3 PC3-10600 1333MHz ECC REG Thermal Sensor DIMM Kingston 824ERTC9
KTM-SX313/8G 8GB DDR3 PC3-10600 1333MHz ECC REG Thermal Sensor DIMM Kingston 828ERTC9
KTM-SX313E/1G 1GB DDR3 PC3-10600 1333MHz ECC DIMM Kingston 821EC9
KTM-SX313E/2G 2GB DDR3 PC3-10600 1333MHz ECC DIMM Kingston 822EC9
KTM-SX313E/4G 4GB DDR3 PC3-10600 1333MHz ECC DIMM Kingston 824EC9
KTM-SX313K3/6G 6GB Kit of 3 2GB DDR3 PC3-10600 1333MHz ECC REG Thermal Sensor DIMM Kingston 822ERTC9-3
KTM-SX313K3/12G 12GB Kit of 3 4GB DDR3 PC3-10600 1333MHz ECC REG Thermal Sensor DIMM Kingston 824ERTC9-3
KTM-SX313K3/24G 24GB Kit of 3 8GB DDR3 PC3-10600 1333MHz ECC REG Thermal Sensor DIMM Kingston 828ERTC9-3
KTM-SX313LV/2G 2GB DDR3 PC3-10600 1333MHz ECC REG Low Power Thermal Sensor DIMM Kingston 822ERLVTC9
KTM-SX313LV/4G 4GB DDR3 PC3-10600 1333MHz ECC REG Low Power Thermal Sensor DIMM Kingston 824ERLVTC9
KTM-SX313LV/8G 8GB DDR3 PC3-10600 1333MHz ECC REG Low Power Thermal Sensor DIMM Kingston 828ERLVTC9
SNE125-S2/32GB 32GB Solid State Drive Kingston SSD/32G
SNE125-S2/64GB 64GB Solid State Drive Kingston SSD/64G
KTM-SX313S/2G 2GB DDR3 PC3-10600 1333MHz ECC REG Single Rank Thermal Sensor DIMM Kingston 822ERSTC9
SVP100S2/96G 96GB Solid State Drive Kingston SSD/96G
SVP100S2/128G 128GB Solid State Drive Kingston SSD/128G
SVP100S2/256G 256GB Solid State Drive Kingston SSD/256G
SVP100S2/512G 512GB Solid State Drive Kingston SSD/512G
SVP100S2B/96G 96GB Kit of 2 48GB Solid State Drive Kingston SSD/48G-2
SVP100S2B/128G 128GB Kit of 2 64GB Solid State Drive Kingston SSD/64G-2
SVP100S2B/256G 256GB Kit of 2 128GB Solid State Drive Kingston SSD/128G-2
SVP100S2B/512G 512GB Kit of 2 256GB Solid State Drive Kingston SSD/256G-2
KTM-SX313SK3/12G 12GB Kit of 3 4GB DDR3 PC3-10600 1333MHz ECC REG Single Rank Thermal Sensor DIMM Kingston 824ERSTC9-3
KTM-SX313LV/16G 16GB DDR3 PC3-10600 1333MHz ECC REG Low Power Thermal Sensor DIMM Kingston 8216ERLVTC9
SVP200S3B/60G 60GB Solid State Drive Kingston SSD/60G
SVP200S37A/60G 60GB Solid State Drive Kingston SSD/60G
SVP200S3B7A/60G 60GB Kit of 2 30GB Solid State Drive Kingston SSD/30G-2
KTM-SX313QLV/16G 16GB DDR3 PC3-10600 1333MHz ECC REG Low Power Quad Rank Thermal Sensor DIMM Kingston 8216ERLVQTC9
SKC300S37A/480G 80GB Solid State Drive Kingston SSD/80G
SKC300S3B7A/480G 480GB Kit of 2 240GB Solid State Drive Kingston SSD/240G-2
SKC100S3/240G 240GB Solid State Drive Kingston SSD/240G
SKC300S37A/240G 240GB Solid State Drive Kingston SSD/240G
KTM-SX316S/8G 8GB DDR3 PC3-12800 1600MHz ECC REG Thermal Sensor DIMM Kingston 838ERTC9
KTM-SX316S8/4G 4GB DDR3 PC3-12800 1600MHz ECC REG Thermal Sensor DIMM Kingston 834ERTC9
KTM-SX316ES/4G 4GB DDR3 PC3-12800 1600MHz ECC DIMM Kingston 834EC9
SE50S37/480G 80GB Solid State Drive Kingston SSD/80G
SE100S37/400G 400GB Solid State Drive Kingston SSD/400G
SE50S37/240G 240GB Solid State Drive Kingston SSD/240G
SKC310S37A/960G 60GB Solid State Drive Kingston SSD/60G
SKC310S3B7A/960G 960GB SSDNow KC310 SSD SATA 3 2.5 (7mm height) Upgrade Bundle Kit Bundle Kit,KC310 Series,SATA3 (6Gbps), SSD 2.5-inch 7mm Kingston