Memory modules
Memory modules
Adding system memory to the server can make programs run faster.
You can increase the amount of system memory by installing options called memory modules.
The maximum amount of system memory the server supports is 384 MB of
unbuffered memory, or 768 MB of registered memory. You can add memory to
the server to increase system performance. The server has three connectors
for installing system-memory modules.
- Attention - You
cannot mix registered and unbuffered DIMMs in the server. To use
registered DIMMs, you must remove all unbuffered DIMMs from the server.
To locate the memory connectors on the system
board, see
System Board Illustration
8476 /
8477.
The memory modules that the server uses are dual-inline
memory modules (DIMMs). The DIMMs that come with
the server are unbuffered synchronous dynamic
random-access memory (SDRAM) with error checking and
correction (ECC). These memory modules have a speed
of 100 MHz. You can add extra memory modules or
replace existing memory modules.
When installing or replacing DIMMs, follow these guidelines:
- The server comes with one or more unbuffered
dual-inline memory modules (DIMMs) installed.
- Install DIMMs with a maximum height of 6.35 cm (2.5 inches).
- Use only 3.3 V dc 100 MHz SDRAM DIMMs.
- Do not mix registered and unbuffered DIMMS. If you use registered DIMMs,
you must remove all unbuffered DIMMs from the server.
A mix of registered and unbuffered memory prevents
the server from completing startup, and results in a
1--3--4 error beep sequence and a blank screen.
- Each memory connector supports a maximum of 256
MB of memory. However, the maximum amount of
unbuffered system memory the server supports is 384 MB.
The server supports up to 768 MB of registered memory.
- To enable ECC, all DIMMs must be ECC, therefore,
install only ECC DIMMs. If you install nonparity (NP)
DIMMs, the server will not power up, and POST
memory error code 164 will be displayed.
- If you are installing DIMMs of different sizes, install
the DIMMs with greater memory capacity starting with
the connector closest to the edge of the system board (DIMM 2).
- After installing or removing a DIMM, you must save
the new configuration information using the
Configuration/Setup Utility program. See
Configuration/Setup utility program menus.
- For more information about the DIMMs that the server
supports, go to the following World Wide Web address:
http://www.ibm.com/pc/us/compat/
For Memory configuration see
System Board Illustration
8476 /
8477.
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