Lenovo ThinkSystem SR950 Setup Manual page 221

CAUTION:
The power-control button on the device and the power switch on the power supply do not turn off the
electrical current supplied to the device. The device also might have more than one power cord. To
remove all electrical current from the device, ensure that all power cords are disconnected from the
power source.
"
CAUTION:
Make sure that all server power cords are disconnected from their power sources before performing
this procedure.
See "Memory module installation rules and order" on page 58 for detailed information about memory
configuration and setup.
If you are installing an optional processor, install it before installing memory modules. See "Install a
processor-heat-sink module" on page 213
See
https://static.lenovo.com/us/en/serverproven/index.shtml
capacities that are supported for your server.
Notes:
• Do not mix RDIMMs and LR-DIMMs in the same server.
• Install higher capacity (ranked) DIMMs first, following the population sequence for the memory mode
being used.
• Installing or removing DIMMs changes the server configuration. When you restart the server, it displays a
message that indicates that the memory configuration has changed. There are multiple ways to view the
server configuration. See "Management options" on page 19 for a description of each management
method and how each method applies to various deployment situations.
If the system board is already installed in the server:
1. If the front cover is installed, remove it. See "Remove the front cover" on page 322.
2. Remove the compute tray with the system board where you are installing the memory module. See
"Remove a compute tray" on page 305.
3. If you are installing a memory module in the lower compute system board, remove the upper system
board or system board filler. See "Remove a system board" on page 309.
" on page 56 " " on page 254
for a list of all the memory module types and
.
Chapter 3 Server hardware setup
217