BIOS Parameters by Server Model

Advanced BIOS Parameters for C22 and C24 Servers

Name

Description

Low Voltage DDR Mode

Whether the system prioritizes low voltage or high frequency

 

memory operations. This can be one of the following:

 

The system prioritizes low voltage memory operations

 

over high frequency memory operations. This mode may

 

lower memory frequency in order to keep the voltage low.

 

The system prioritizes high frequency operations over

 

low voltage operations.

DRAM Refresh rate

Allows you to set the rate at which the DRAM cells are

 

refreshed. This can be one of the following:

 

1xDRAM cells are refreshed every 64ms.

 

2xDRAM cells are refreshed every 32ms.

 

3xDRAM cells are refreshed every 21ms.

 

4xDRAM cells are refreshed every 16ms.

Channel Interleaving

Whether the CPU divides memory blocks and spreads

 

contiguous portions of data across interleaved channels to enable

 

simultaneous read operations. This can be one of the following:

 

AutoThe CPU determines what interleaving is done.

 

Some channel interleaving is used.

 

 

 

The maximum amount of channel interleaving is used.

Rank Interleaving

Whether the CPU interleaves physical ranks of memory so that

 

one rank can be accessed while another is being refreshed. This

 

can be one of the following:

 

AutoThe CPU determines what interleaving is done.

 

Some rank interleaving is used.

 

 

 

The maximum amount of rank interleaving is used.

 

Cisco UCS C-Series Servers Integrated Management Controller CLI Configuration Guide, Release 1.5

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OL-28893-01

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Cisco Systems UCSCPCIEBTG, 57712 manual Low Voltage DDR Mode, Dram Refresh rate, Channel Interleaving, Rank Interleaving