Lenovo System x

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System x is a line of x86 servers produced by IBM, and later Lenovo. They were a sub-brand of IBM's System brand, alongside IBM Power Systems, IBM System z and IBM System Storage). In addition, IBM System x was the main component of the IBM System Cluster 1350 solution.

In January 2014, IBM announced the sale of its x86 server business to Lenovo for $2.3 billion, in a sale completed October 1, 2014.[1][2]


Starting out as IBM PC Server, rebranded Netfinity, then eServer xSeries and now System x, these servers are distinguished by being based on off-the-shelf x86 CPUs; IBM positions them as their "low end" or "entry" offering. Previously IBM servers based on AMD Opteron CPUs did not share the xSeries brand; instead they fell directly under the eServer umbrella. However, current AMD Opteron-based servers fall under the System x brand.

IBM PC Server[edit]

PC Server range[edit]

  • IBM PC Server 300
  • IBM PC Server 310 (PCI/ISA)
  • IBM PC Server 315 (PCI/ISA)
  • IBM PC Server 320 (PCI/EISA)
  • IBM PC Server 325 (PCI/EISA)
  • IBM PC Server 330 (PCI/EISA)
  • IBM PC Server 500 (MCA)
  • IBM PC Server 520 (PCI/EISA or PCI/MCA)
  • IBM PC Server 704 (PCI/EISA)
  • IBM PC Server 720 (PCI/MCA)

Numbering scheme[edit]

  • 300 range for high-volume, entry level servers
  • 500 range for midrange
  • 700 range for high-end.

IBM Netfinity[edit]

Ibm netfinity.jpg

Not to be confused with a different IBM product with a similar name, NetFinity (notice the capital F).

Netfinity range[edit]

  • IBM Netfinity 1000
  • IBM Netfinity 3000, 3500
  • IBM Netfinity 4000R, 4500R
  • IBM Netfinity 5000, 5100, 5500, 5500-M10, 5500-M20, 5600
  • IBM Netfinity 6000R
  • IBM Netfinity 7000, 7000-M10, 7100, 7600
  • IBM Netfinity 8500R

Numbering scheme[edit]

The numbering scheme started off similar to that of the IBM PC Servers, but additional ranges were added, like the entry-level 1000 model later on. Models ending with an R, are rack-mount.

KVM Cabling scheme[edit]

Some Netfinity servers used IBM's C2T cabling scheme for Keyboard/Video/Mouse.

IBM eServer xSeries[edit]

xSeries range[edit]

  • IBM eServer xSeries 100, 130, 135, 150
  • IBM eServer xSeries 200, 205, 206, 206m, 220, 225, 226, 230, 232, 235, 236, 240, 250, 255, 260
  • IBM eServer xSeries 300, 305, 306, 306m, 330, 335, 336, 340, 342, 345, 346, 350, 360, 365, 366, 370, 380, 382
  • IBM eServer xSeries 440, 445, 450, 455, 460

Numbering scheme[edit]

  • 100 series are entry-level tower servers
  • 200 series are tower servers
  • 300 series are rack-mount servers
  • 400 series are rack-mount scalable servers

KVM Cabling scheme[edit]

Many xSeries servers used IBM's C2T cabling scheme for Keyboard/Video/Mouse.

IBM eServer[edit]

Ibm eserver.jpg

eServer range[edit]

Numbering scheme[edit]

For marketing reasons the AMD processor based e325, e326 and e326m and the BladeCenter which supports non-Intel processor products were not branded xSeries, but were instead placed directly under the eServer brand. The xSeries brand was limited to only Intel-based server products.

From a numbering perspective the AMD servers did fit into the xSeries range, under the similar x335 and x336 Intel processor products. These numbers were not re-used in the xSeries range to prevent confusion.

IBM System x range[edit]

The IBM System x3300 M4 with LED lighting
  • IBM System x3105, x3100, x3100 M3, x3100 M4, x3100 M5
  • IBM System x3200, x3200 M2, x3200 M3, x3250, x3250 M2, x3250 M3, x3250 M4, x3250 M5, x3250 M6
  • IBM System x3300 M3, x3300 M4
  • IBM System x3350
  • IBM System x3400, x3400 M2, x3400 M3, x3450, x3455
  • IBM System x3500, x3500 M2, x3500 M3, x3500 M4
  • IBM System x3530 M3, x3530 M4
  • IBM System x3550, x3550 M2, x3550 M3, x3550 M4, x3550 M5
  • IBM System x3620 M3
  • IBM System x3630 M3, x3630 M4
  • IBM System x3650, x3650T, x3655, x3650 M2, x3650 M3, x3650 M4, x3650 M4 HD, x3650 M4 BD, 3650 M5
  • IBM System x3690 X5
  • IBM System x3750 M4
  • IBM System x3755, x3755 M3
  • IBM System x3800, x3850, x3850 M2, x3850 X5, x3850 X6
  • IBM System x3950, x3950 M2, x3950 X5, x3950 X6

Lenovo System x range[edit]

  • Lenovo System x3100 M5
  • Lenovo System x3250 M5, x3250 M6
  • Lenovo System x3500 M5
  • Lenovo System x3550 M4, x3550 M5
  • Lenovo System x3650 M4, x3650 M5
  • Lenovo System x3850 X6
  • Lenovo System x3950 X6
  • Lenovo NextScale
  • Lenovo FlexSystem

Lenovo also had its own ThinkServer family of Intel servers. This family is technically less advanced than System x. At the time of this writing, System x is being discontinued and replaced by the Lenovo ThinkSystem family of Intel servers.

Enterprise eX5 architecture[edit]

Enterprise X4 architecture[edit]

EX4 Chipset.png

Numbering scheme[edit]

2nd digit increments to show capability

3rd digit is a 0 for tower models, and 5 for rack-mount

4th digit is a 0 for Intel processors, and 5 for AMD Opteron.

Models with a T at the end are meant for Telco purposes.


An iDataPlex rack in a Portable Modular Data Center.

System x iDataPlex was used by many TOP500 supercomputers, including SuperMUC and Stampede. Other smaller installations included SciNet Consortium's General Purpose Cluster[3][4][5]

See also[edit]


  1. ^ "IBM sells its x86 server business to Lenovo for $2.3 billion". CNET. 2014-01-23. Retrieved 2018-08-01.
  2. ^ Chanthadavong, Aimee. "Lenovo finalises acquisition of IBM's x86 server business". ZDNet. Retrieved 2018-08-01.
  3. ^ "Toronto team completes Canada's most powerful supercomputer". CBC News. June 18, 2009. Retrieved 2009-06-18.
  4. ^ Hall, Joseph (June 18, 2009). "U of T supercomputer probes origins of the universe". The Star. Retrieved 2009-06-18.
  5. ^ "University of Toronto's Supercomputer Goes Online Thursday". All Headline News. June 18, 2009. Retrieved 2009-06-18.