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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
Enables you to govern the frequency of the communication links among the processors in the system.
Speed
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 processor.
However, if power saving considerations outweigh performance, you might want to reduce the frequency of the
processor 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
Software
Enables or disables the software 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.
Configurable TDP
Enables you to configure the TDP level. The available options are Nominal, Level 1, and Level 2. This option is set
to Nominal by default.
SST-Performance
Enables you to reconfigure the processor using Speed Select Technology.
Profile
x2APIC Mode
Enables or disables the x2APIC mode. This option is set to Disabled by default.
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Pre-operating system management applications
NOTE:
The standard and basic bin processors support lower link frequencies.
NOTE:
This option is only available on certain stock keeping units (SKUs) of the processors.
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