DescriptionName
Whetherthe systemprioritizes low voltageor high frequency
memoryoperations. This can be one of the following:
•—Thesystem prioritizes low voltage memory operations
overhigh frequency memory operations. This mode may
lowermemory frequency in order to keep the voltage low.
•—Thesystem prioritizeshigh frequency operationsover
lowvoltage operations.
LowVoltage DDR Mode
Allowsyou to set the rate at which the DRAM cellsare
refreshed.This can be one of the following:
•1x—DRAMcells are refreshedevery 64ms.
•2x—DRAMcells are refreshedevery 32ms.
•3x—DRAMcells are refreshedevery 21ms.
•4x—DRAMcells are refreshedevery 16ms.
DRAMRefresh rate
Whetherthe CPU dividesmemory blocks and spreads
contiguousportions of data across interleaved channels to enable
simultaneousread operations. This can be one of the following:
•Auto—TheCPU determineswhat interleavingis done.
•—Somechannel interleavingis used.
•
•
•—Themaximum amount of channelinterleaving is used.
ChannelInterleaving
Whetherthe CPU interleaves physical ranks of memory so that
onerank can be accessed while another is being refreshed. This
canbe one of the following:
•Auto—TheCPU determineswhat interleavingis done.
•—Somerank interleavingis used.
•
•
•—Themaximum amountof rank interleaving is used.
RankInterleaving
Cisco UCS C-Series Servers Integrated Management Controller CLI Configuration Guide, Release 1.5
192 OL-28893-01
BIOS Parameters by Server Model
Advanced BIOS Parameters for C22 and C24 Servers