Dell PowerEdge R740xd Installation And Service Manual page 46

Option Description
The options available are Maximum data rate, 10.4 GT/s, and 9.6 GT/s. This option is set to Maximum data rate
by default.
Maximum data rate indicates that the BIOS runs the communication links at the maximum frequency supported by
the processors. You can also select specific frequencies that the processors support, which can vary.
For best performance, you should select Maximum data rate. Any reduction in the communication link frequency
affects the performance of non-local memory accesses and cache coherency traffic. In addition, it can slow access
to non-local I/O devices from a particular CPU.
However, if power saving considerations outweigh performance, you might want to reduce the frequency of the
CPU communication links. If you do this, you should localize memory and I/O accesses to the nearest NUMA node
to minimize the impact to system performance.
Virtualization Enables or disables the virtualization technology for the processor. This option is set to Enabled by default.
Technology
Adjacent Cache Optimizes the system for applications that need high utilization of sequential memory access. This option is set to
Line Prefetch Enabled by default. You can disable this option for applications that need high utilization of random memory
access.
Hardware Enables or disables the hardware prefetcher. This option is set to Enabled by default.
Prefetcher
DCU Streamer Enables or disables the Data Cache Unit (DCU) streamer prefetcher. This option is set to Enabled by default.
Prefetcher
DCU IP Prefetcher Enables or disables the Data Cache Unit (DCU) IP prefetcher. This option is set to Enabled by default.
Sub NUMA Cluster Enables or disables the Sub NUMA Cluster. This option is set to Disabled by default.
UPI Prefetch Enables you to get the memory read started early on DDR bus. The Ultra Path Interconnect (UPI) Rx path will
spawn the speculative memory read to Integrated Memory Controller (iMC) directly. This option is set to Enabled
by default.
Logical Processor Enables you to improve the energy efficiency of a system. It uses the operating system core parking algorithm and
Idling parks some of the logical processors in the system which in turn allows the corresponding processor cores to
transition into a lower power idle state. This option can only be enabled if the operating system supports it. It is set
to Disabled by default.
x2APIC Mode Enables or disables the x2APIC mode. This option is set to Disabled by default.
Dell Controlled Controls the turbo engagement. Enable this option only when System Profile is set to Performance.
Turbo
Number of Cores Controls the number of enabled cores in each processor. This option is set to All by default.
per Processor
Processor Core Specifies the maximum core frequency of the processor.
Speed
Processor n
The following settings are displayed for each processor installed in the system:
Option
Family-Model-
Stepping
46 Pre-operating system management applications
NOTE: The standard and basic bin processors support lower link frequencies.
NOTE: Depending on the number of installed CPUs, there might be up to four processor listings.
NOTE: Depending on the number of CPUs, there might be up to four processors listed.
Description
Specifies the family, model, and stepping of the processor as defined by Intel.