User's Manual

DescriptionName
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.
Low Voltage DDR Mode
Allows you to set the rate at which the DRAM cells are
refreshed. This can be one of the following:
• 1x—DRAM cells are refreshed every 64ms.
• 2x—DRAM cells are refreshed every 32ms.
• 3x—DRAM cells are refreshed every 21ms.
• 4x—DRAM cells are refreshed every 16ms.
DRAM Refresh rate
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:
• Auto—The CPU determines what interleaving is done.
• —Some channel interleaving is used.
•
•
• —The maximum amount of channel interleaving is used.
Channel 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:
• Auto—The CPU determines what interleaving is done.
• —Some rank interleaving is used.
•
•
• —The maximum amount of rank interleaving is used.
Rank Interleaving
Cisco UCS C-Series Servers Integrated Management Controller CLI Configuration Guide, Release 1.5
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BIOS Parameters by Server Model
Advanced BIOS Parameters for C420 Servers