•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
•The optional memory riser boards only support PC800 memory modules.
NOTE: For more information on upgrading system memory or on addressing memory with
Sample Configurations
Sa m pl e Co n f ig u ra t io n s w it h Me m o r y R is er Bo a r ds
Total Memory |
| Riser Board A |
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| Riser Board B |
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| Socket 1 | Socket 2 | Socket 3 | Socket 4 | Socket 1 | Socket 2 | Socket 3 | Socket 4 |
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128 MB | 64 MB | CRIMM | empty | empty | 64 MB | CRIMM | empty | empty |
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256 MB | 64 MB | 64 MB | CRIMM | empty | 64 MB | 64 MB | CRIMM | empty |
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384 MB | 64 MB | 64 MB | 64 MB | CRIMM | 64 MB | 64 MB | 64 MB | CRIMM |
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512 MB | 64 MB | 64 MB | 64 MB | 64 MB | 64 MB | 64 MB | 64 MB | 64 MB |
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256 MB | 128 MB | CRIMM | empty | empty | 128 MB | CRIMM | empty | empty |
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512 MB | 128 MB | 128 MB | CRIMM | empty | 128 MB | 128 MB | CRIMM | empty |
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768 MB | 128 MB | 128 MB | 64 MB | 64 MB | 128 MB | 128 MB | 64 MB | 64 MB |
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1024 MB | 128 MB | 128 MB | 128 MB | 128 MB | 128 MB | 128 MB | 128 MB | 128 MB |
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512 MB | 256 MB | CRIMM | empty | empty | 256 MB | CRIMM | empty | empty |
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1024 MB | 256 MB | 256 MB | CRIMM | empty | 256 MB | 256 MB | CRIMM | empty |
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1280 MB | 256 MB | 256 MB | 64 MB | 64 MB | 256 MB | 256 MB | 64 MB | 64 MB |
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Memory Riser Board Replacement
11