ProLiant BL25p Server Blade Maintenance and Service Guide

Removal and replacement procedures 14
•
Both DIMM slots in a memory bank must be populated.
• Both DIMMs in a memory bank must be identical.
• Processor 1 memory bank 1 must always be populated.
• If mixing dual- and single-rank DIMMs, the dual-rank DIMMs must be installed in memory bank 1.
For optimal performance in most applications, populate memory bank 1 for every populated processor
socket.
PC3200 DIMMs can either be single- or dual-rank. While it is not normally important for you to
differentiate between these two types of DIMMs, certain DIMM configuration requirements are based on
these classifications.
Certain configuration requirements exist with single- and dual-rank DIMMs that allow the architecture to
optimize performance. A dual-rank DIMM is similar to having two separate DIMMs on the same module.
Although only a single DIMM module, a dual-rank DIMM acts as if it were two separate DIMMs. The
primary reason for the existence of dual-rank DIMMs is to provide the largest capacity DIMM given the
current DIMM technology. If the maximum DIMM technology allows for creating 2-GB single-rank DIMMs,
a dual-rank DIMM using the same technology would be 4-GB.
Item Description Memory bank
1-2 DIMM slots 1 and 2 Processor 1 memory bank 1
3-4 DIMM slots 3 and 4 Processor 1 memory bank 2
5-6 DIMM slots 5 and 6 Processor 2 memory bank 1
7-8 DIMM slots 7 and 8 Processor 2 memory bank 2
Processor
To remove the component:
1. Power down the server blade and remove it from the server blade enclosure ("Server blade
preparation" on page 11).
2. Remove the access panel ("Access panel" on page 12).