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2. If you are planning to install or remove a microprocessor, memory module, PCI
adapter, battery, or other non-hot-swap optional device, turn off the server and
all attached devices and disconnect all external cables and power cords (see
“Turning off the server” on page 39).
Attention: In a dc power environment, only trained service personnel other
than Lenovo service technicians are authorized to connect or disconnect power
to the dc power supply. See the documentation that comes with each dc power
supply.
3. Press down on the left and right side latches and pull the server out of the rack
enclosure until both slide rails lock.
Note: You can reach the cables on the back of the server when the server is in
the locked position.
4. Lift the cover-release latch 1. Lift the cover off the server and set the cover
aside.
Attention: For proper cooling and airflow, replace the cover before you turn on
the server. Operating the server for extended periods of time (more than 30
minutes) with the cover removed might damage server components.
Installing a memory module
The following notes describe the types of dual inline memory modules (DIMMs) that
the server supports and other information that you must consider when installing
DIMMs:
v The server supports up to 12 Fully Buffered DIMM PC2-5300 512 MB, 1 GB, 2
GB, and 4 GB DIMMs, for a maximum of 48 GB of system memory. See
http://www.lenovo.com/accessories for a list of memory modules that you can use
with the server.
Note: Because some memory is reserved for system operation, the actual
usable memory size that is reported by the operating system is less than the total
installed size.
v The server comes with a minimum of two 512 MB DIMMs, installed in slots 1 and
4. When you install additional DIMMs, you must install two identical DIMMS at a
time, in the order shown in the following table, to maintain performance.
10 ThinkServer RD120 Types 6444, 6445, 6446, and 6447: Installation Guide