Lenovo ThinkSystem SR950 Setup Manual page 20

The four-socket upgradable configurations support two or four processors with the following requirements/
capabilities:
• Only 8100 series processors are supported.
• Fan 1 to 6 are required to be installed.
• The upper tray filler is installed in the upper tray slot.
• Up to 12 drives (bay 0 - 11) are supported.
See the following for the support variations depending on number of processors that are installed:
• "Four-socket upgradable, two processors" on page 16
• "Four-socket upgradable, four processors" on page 16
Notes:
• When four processors are installed, they must be configured in a ring topology.
• These configurations allow a simple upgrade to 8-socket ones. See "Eight-socket storage rich" on page
18 for details about 8-socket configurations.
Four-socket upgradable, two processors
This configuration comes with two processors, requires at least one 1100/1600-watt PSU, and supports up
to:
• 24 memory modules.
• six rear PCIe slots.
See the following tables for the location of the supported components.
Table 16. Location of the two processors and 24 supported memory module slots (viewed from the front)
Not populated
CPU 1 and DIMM 1-12
Table 17. Location of the six supported PCIe slots (viewed from the rear)
PCIe 5
Four-socket upgradable, four processors
This configuration comes with four processors, requires at least two 1100/1600-watt PSUs, and supports up
to:
• 48 memory modules.
• 15 rear PCIe slots.
See the following tables for the location of the supported components.
ThinkSystem SR950 Setup Guide
16
Upper tray filler
PCIe 6 PCIe 7 PCIe 8
(ML2)
Not populated
CPU 2 and DIMM 13-24
PCIe 9
(LOM)
PCIe
17