Lenovo ThinkSystem SR950 Setup Manual page 16

Consider "Four-socket upgradable" on page 15 or "Four-socket upgradable / storage rich" on page 17 for
an easier potential upgrade in the future.
For more information about upgrading to the eight-socket configuration, see the following topic:
http://thinksystem.lenovofiles.com/help/topic/7X12/installing_the_4S-to-8S_upgrade_option.html
Four-socket performance, 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 4. Location of the two processors and 24 supported memory module slots (viewed from the front)
Not populated
CPU 1 and DIMM 1-12
Table 5. Location of the six supported PCIe slots (viewed from the rear)
PCIe 5
Four-socket performance, three processors
This configuration comes with three processors, requires at least two 1100/1600-watt PSUs, and supports
up to:
• 36 memory modules.
• Ten rear PCIe slots.
See the following tables for the location of the supported components.
Table 6. Location of the three processors and 36 supported memory module slots (viewed from the front)
Not populated
CPU 1 and DIMM 1-12
Table 7. Location of ten supported PCIe slots (viewed from the rear)
PCIe 1
1. This slot is blank if a 2 x16 riser is installed.
ThinkSystem SR950 Setup Guide
12
Upper tray filler
PCIe 6 PCIe 7
Upper tray filler
(P4)
1
Not populated
CPU 2 and DIMM 13-24
PCIe 8 PCIe 9
(ML2) (LOM)
CPU 4 and DIMM 37-48
CPU 2 and DIMM 13-24
PCIe
17