Cisco UCS B22 M3 Installation And Service Note - Page 21
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Supported DIMMs
The DIMMs supported in this blade server are constantly being updated. A list of currently supported and available DIMMs is in the
specification sheets at:
http://www.cisco.com/en/US/products/ps10280/products_data_sheets_list.html
Do not use any memory DIMMs other than those listed in the specification sheet. Doing so may irreparably damage the server and
require an RMA and down time.
Low-Voltage DIMM Considerations
The server can be ordered with low-voltage (1.35 V) DIMMs or mixed-voltage (1.35V/1.5 V) DIMMs.
There is a setting in the BIOS Setup utility that you can use to change the DDR memory mode when the server has all low-voltage
DIMMs installed. To access this setting, follow these steps:
Procedure
Step 1
Enter the BIOS setup utility by pressing the F2 key when prompted during bootup.
Step 2
Select the Advanced tab.
Step 3
Select Low Voltage DDR Mode.
Step 4
In the pop-up window, select either Power Saving Mode or Performance Mode.
• Power Saving Mode–Enables low-voltage memory operation. This setting is available only if all DIMMs installed
support low-voltage operation.
• Performance Mode–Disables low-voltage memory operation. If you mix low-voltage DIMMs with mixed-voltage
DIMMs, the system defaults to this setting.
Step 5
Press F10 to save your changes and exit the setup utility, or you can exit without saving changes by pressing Esc.
Memory Arrangement
Keep in mind the following rules when adding DIMMs to this server:
• Only use Cisco-provided DIMMs.
• Mixing different speed DIMMs causes the server to set the memory speed to that of the slowest installed DIMMs.
• If memory mirroring is used, the total memory capacity is reduced by 50%.
• CPU1 and CPU2 (if used) must always be configured identically.
The blade server contains 12 DIMM slots—six for each CPU. Each set of six DIMM slots is arranged into three channels, where
each channel has 2 DIMMs.
Each channel is identified by a letter—B, C, D for CPU1, and F, G, H for CPU 2. Each DIMM slot is identified by a number, either
0 or 1. Note that each DIMM slot 0 is blue, while each slot 1 is black.
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