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Memory Riser Board Replacement 11
• Memory sockets on the riser boards must be upgraded in matched
pairs. In other words, two sockets in a pair must contain modules of
identical capacity, number of components, and speed. See "Memory
Riser Board Components" to identify pairs of sockets.
• Not all memory sockets on the memory riser boards need to be
populated: if one or more pairs of memory sockets contain RIMMs,
then the next pair must contain CRIMMs, and the remaining pair(s)
can be empty. As another example, if the first and second pairs of
memory sockets on the riser boards contain RIMMs, then the third
pair must contain CRIMMs, and the fourth pair can remain empty.
• Mixed pairs of error checking and correction (ECC) and non-ECC
modules all function as non-ECC.
• The optional memory riser boards only support PC800 memory
modules.
NOTE: For more information on upgrading system memory or on addressing
memory with 4-GB configurations, see the
User’s Guide
. You can access this
document from the
Dell Precision ResourceCD
or from the User’s Guides icon
on your desktop if you have not reinstalled your operating system.
Sample Configurations
Sample Configurations with Memory Riser Boards
Total Memory Riser Board A Riser Board B
Socket 1 Socket 2 Socket 3 Socket 4 Socket 1 Socket 2 Socket 3 Socket 4
128 MB 64 MB CRIMM empty empty 64 MB CRIMM empty empty
256 MB 64 MB 64 MB CRIMM empty 64 MB 64 MB CRIMM empty
384 MB 64 MB 64 MB 64 MB CRIMM 64 MB 64 MB 64 MB CRIMM
512 MB 64 MB 64 MB 64 MB 64 MB 64 MB 64 MB 64 MB 64 MB
256 MB 128 MB CRIMM empty empty 128 MB CRIMM empty empty
512 MB 128 MB 128 MB CRIMM empty 128 MB 128 MB CRIMM empty
768 MB 128 MB 128 MB 64 MB 64 MB 128 MB 128 MB 64 MB 64 MB
1024 MB 128 MB 128 MB 128 MB 128 MB 128 MB 128 MB 128 MB 128 MB
512 MB 256 MB CRIMM empty empty 256 MB CRIMM empty empty
1024 MB 256 MB 256 MB CRIMM empty 256 MB 256 MB CRIMM empty
1280 MB 256 MB 256 MB 64 MB 64 MB 256 MB 256 MB 64 MB 64 MB