3-28
Cisco UCS C460 Server Installation and Service Guide
OL-22326-01
Chapter 3 Maintaining the Server
Installing or Replacing Server Components
Replacing DIMMs
This section includes the following sections:
• Memory Performance Guidelines and Population Rules, page 3-28
• DIMM Installation Procedure, page 3-30
Note To ensure the best server performance, it is important that you are familiar with memory performance
guidelines and population rules before you install or replace memory modules.
Memory Performance Guidelines and Population Rules
This section describes the type of memory that the server requires and its effect on performance. The
following topics are covered:
• Supported DIMMs, page 3-28
• Memory Channels, page 3-28
• DIMM Population Rules, page 3-29
• DIMM and Rank Sparing, page 3-29
Supported DIMMs
The qualified and supported part numbers for this component are subject to change over time. For the most
up-to-date list of replaceable components, see the following URL and then scroll to Technical Specifications:
http://www.cisco.com/en/US/products/ps10493/products_data_sheets_list.html
Memory Channels
Each CPU supports two memory risers. Figure 3-18 shows the placement of the CPUs and their
corresponding memory risers. The view shown is facing the front of the server. This numbering is also
inscribed on the top of the CPU cage.
Figure 3-18 CPUs and Memory Risers
Each memory riser contains two memory buffers that are connected to the CPU by serial memory
interface (SMI) channels. Each memory buffer has two channels, each containing a pair of DDR3
DRAM slots.
In Figure 3-19, the buffers and channels are:
• Buffer 1, channel 1: slots 1B and 1D
• Buffer 1, channel 2: slots 1A and 1C
• Buffer 2, channel 1: slots 2B and 2D
• Buffer 2, channel 2: slots 2A and 2C
CPU 4 CPU 3 CPU 2 CPU 1
MEM 8 MEM 7 MEM 6 MEM 5 MEM 4 MEM 3 MEM 2 MEM 1
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