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Document ID: MIGR-47ZQPG

Netfinity 1000 - Memory modules

Applicable to: World-Wide

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 your server. To use registered DIMMs, you must
remove all unbuffered DIMMs from your server.

Note
The following illustration is for reference only. Before you install memory, be sure to check the orientation of
the server system board for the correct connector locations.

To locate the memory connectors on the system board, see System board illustration .

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 your 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 your server supports is 384 MB. Your 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/

Memory configuration: When you are adding or removing memory, install the DIMMs with greater memory
capacity starting with the connector closest to the edge of the system board (DIMM 2).

Table 5 and Table 6 show some of the possible memory configurations for the server. The contents of these tables and additional information can be found on a label located inside the server. Alternative configurations are possible.

Table 5. Memory configurations (unbuffered)

• Total Memory (MB)	DIMM 2	DIMM 1	DIMM 0
  32	32	0	0
  64	64	0	0
  64	32	32	0
  96	64	32	0
  96	32	32	32
  128	128	0	0
  128	64	32	32
  128	64	64	0
  192	64	64	64
  256	128	64	64
  256	128	128	0
  384	128	128	128

  
  

  
  Table 6. Memory configurations (registered)
  
  

  Total Memory (MB)	DIMM 2	DIMM 1	DIMM 0
  256	256	0	0
  512	256	256	0
  768	256	256	256

  
  

  Note: The values in Table 5 and Table 6 are represented in megabytes (MB).
  
  Installing or removing memory modules:
  This section gives the procedure for installing memory modules. If you want to remove a memory module,
  reverse the order of the following steps.
  
  Before you begin:

  • Read Safety information
  • Read the documentation that comes with the option.
  • Read Accessing the system board
  
  

  
  Notes
  1. When you are removing a memory module, be careful not to push too hard on the retaining clips because the memory module might abruptly eject from the connector.
  2. Each memory connector contains two keys (dividers), which are used to assure that a memory-module can be installed only in the correct position.
  3. A retaining clip at each end of the connector locks the memory module into place.
  4. For information about memory configuration, see Table 5 above.
  
  To install a DIMM:
  1. Remove the server side cover (see Disconnecting cables and removing the side cover).
  2. Locate the memory connectors on the system board. See the illustration at the beginning of this section.
  3. Be sure that the retaining clips are in the open position, as shown in the following right-hand illustration. If the retaining clips are perpendicular to the connector, push outward on them until they click open.
  

  • 
  
  4. Touch the static-protective package containing the DIMM to any unpainted metal surface in the server;
  then, remove the DIMM.
  5. Position the DIMM above the connector so that the two notches on the bottom edge of the DIMM align
  properly with the connector.
  6. Firmly push the DIMM straight down into the connector until the retaining clips close and snugly fit
  around both ends of the DIMM.
  
  

  
  
  
  

  Note Adding or removing DIMMs changes the configuration information in the server. When you restart the server, the system displays POST error 164. Start the Configuration/Setup Utility program and select Save Settings.

  
  

  7. To install another DIMM, repeat steps 3 through 6.
  8. If you want to install or remove any other options, do so now. Otherwise, go to Completing the
  installation .
  
  

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  	Date Created	18-05-99
  	Last Updated	18-05-99
  	Revision Date	26-05-2000
  	Brand	IBM PC Server
  	Product Family	Netfinity 1000
  	Machine Type	8477
  	Model	All
  	TypeModel
  	Retain Tip (if applicable)
  	Reverse Doclinks and Admin Purposes