Dell EMC PowerEdge M640 Installation and Service Manual

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Processor Settings details

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The Processor Settings screen details are explained as follows:
Option
Description
Logical Processor

Enables or disables the logical processors and displays the number of logical processors. If this option is set to Enabled, the BIOS displays all the logical processors. If this option is set to Disabled, the BIOS displays only one logical processor per core. This option is set to Enabled by default.

CPU Interconnect Speed
Enables you to govern the frequency of the communication links among the CPUs in the system.
  • NOTE: The standard and basic bin processors support lower link frequencies.

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 Technology
Enables or disables the virtualization technology for the processor. This option is set to Enabled by default.
Adjacent Cache Line Prefetch
Optimizes the system for applications that need high utilization of sequential memory access. This option is set to Enabled by default. You can disable this option for applications that need high utilization of random memory access.
Hardware Prefetcher
Enables or disables the hardware prefetcher. This option is set to Enabled by default.
DCU Streamer Prefetcher
Enables or disables the Data Cache Unit (DCU) streamer prefetcher. This option is set to Enabled by default.
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 Enabled 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 Idling
Enables you to improve the energy efficiency of a system. It uses the operating system core parking algorithm and 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.
Configurable TDP
Enables you to reconfigure the processor Thermal Design Power (TDP) levels during POST based on the power and thermal delivery capabilities of the system. TDP verifies the maximum heat the cooling system is needed to dissipate. This option is set to Nominal by default.
  • NOTE: This option is only available on certain stock keeping units (SKUs) of the processors.
x2APIC Mode
Enables or disables the x2APIC mode. This option is set to Disabled by default.
Dell Controlled Turbo
Controls the turbo engagement. Enable this option only when System Profile is set to .
  • NOTE: Depending on the number of installed CPUs, there might be up to four processor listings.
Number of Cores per Processor
Controls the number of enabled cores in each processor. This option is set to All by default.
Processor 64-bit Support
Specifies if the processors support 64-bit extensions.
Processor Core Speed
Specifies the maximum core frequency of the processor.
Process Bus Speed
Displays the bus speed of the processor.
Processor n
  • NOTE: Depending on the number of CPUs, there might be up to n processors listed.

The following settings are displayed for each processor installed in the system:

Option
Description
Family-Model-Stepping
Specifies the family, model, and stepping of the processor as defined by Intel.
Brand
Specifies the brand name.
Level 2 Cache
Specifies the total L2 cache.
Level 3 Cache
Specifies the total L3 cache.
Number of Cores
Specifies the number of cores per processor.

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