Processors

Displays summary of the installed processors.

[Enabled] improves the overall processor performance when all processor cores are not being fully utilized. A processor core can run above its rated frequency for a short period of time when it is in turbo mode.

When a preset mode is selected, the low-level settings are not changeable and will be grayed out. To change the settings, choose System Settings > Operating Modes > Choose Operating Mode > Custom Mode.

You can select to controls CPU P-states (performance states).

[None]: Disables all P-states and processors work either at rated frequency or in Turbo Mode (if Turbo Mode is enabled).

[Legacy]: CPU P-states will be presented to the OS. The OS power management (OSPM) controls which P-state is selected.

[Autonomous]: The P-states are fully controlled by system hardware. No P-state support is required in the OS or VM.

[Cooperative] is a combination of [Legacy] and [Autonomous]. The P-states are still controlled by hardware but the OS can provide hints to the hardware for P-state limits, indicating the desired setting.

When a preset mode is selected, the low-level settings are not changeable and will be grayed out. To change the settings, choose System Settings > Operating Modes > Choose Operating Mode > Custom Mode.

C-states reduces power consumption during the idle time.

[Legacy]: The operating system initiates the C-state transitions. For E5/E7 processors, ACPI C1/C2/C3 map to Intel C1/C3/C6. For 6500/7500 processors, ACPI C1/C3 map to Intel C1/C3 (ACPI C2 is not available). Some OS may defeat the ACPI mapping (e.g., Intel idle driver).

When a preset mode is selected, the low-level settings are not changeable and will be grayed out. To change the settings, choose System Settings > Operating Modes > Choose Operating Mode > Custom Mode.

[Enabled]: Saves power by halting processor cores that are idle.

Using this feature requires an operating system supporting C1E state. Changes take effect after the system rebooted.

When a preset mode is selected, the low-level settings are not changeable and will be grayed out. To change the settings, choose System Settings > Operating Modes > Choose Operating Mode > Custom Mode > C-States > [Legacy]/[Disabled] .

Enables or disables logical processor cores on processors

Allows memory to be marked as executable or non-executable when used with a supporting operating system.

Enables or disables DSA (Data Streaming Accelerator).

Enables or disables Intel® Trusted Execution Technology (Intel® TXT).

Enables or disables Intel® Virtualization Technology.

Lightly-threaded applications and some benchmarks can take advantage of this feature when it is enabled.

Lightly-threaded applications and some benchmarks can take advantage of this feature when it is enabled.

Lightly-threaded applications and some benchmarks can take advantage of this feature when it is enabled.

It is recommended that the Data Cache Unit (DCU) IP Prefetcher is set to [Enabled] for the most environments. However, some environments may benefit from having it set to [Disabled], e.g. Java.

When [Enabled] is selected, the Direct Cache Access (DCA) allows the capable I/O devices, such as a network controller, to place data directly into the processor cache, improving application response times.

[Enabled]: The optimal turbo frequency of processors can be adjusted dynamically based on processor utilization. This feature is also influenced by Power/Performance Bias.

When a preset mode is selected, the low-level settings are not changeable and will be grayed out. To change the settings, choose System Settings > Operating Modes > Choose Operating Mode > Custom Mode > Turbo Mode > [Enabled]

When [Enabled] is selected, the processor uncore (all miscellaneous logic inside the processor package) dynamically changes the speed based on the workload.

Limiting the QPI/UPI connections to the minimum number can save power. If maximum performance is desired, all QPI links should be left enabled.

When a preset mode is selected, the low-level settings are not changeable and will be grayed out. To change the settings, choose System Settings > Operating Modes > Choose Operating Mode > Custom Mode.

SNC (Sub NUMA cluster) partitions the cores and last-level cache into clusters with each cluster bound to a set of memory controllers in the system, dividing each CPU package into 2 or 4 NUMA nodes (High Bandwidth Memory processor only supports 4 NUMA nodes). This feature improves average latency to the last-level cache.

You can select the appropriate snoop mode based on the workload.

Setting the snoop mode preference does not always guarantee that it will be selected. The mode will be changed if the current hardware configuration does not support the desired mode

XPT prefetch is used to enable a read request that is sent to the last level cache to speculatively issue a copy of that read to the memory controller prefetching.

UPI prefetch is used to enable an early memory read on a DDR bus.

The UPI receive path spawns a memory read to the memory controller prefetcher.

Enables or disables Total Memory Encryption (TME).

Enables or disables Multikey Total Memory Encryption (MK-TME).

Displays Max MKTME (Multi-Key Total Memory Encryption) Keys.

Enable/Disable Trust Domain Extension (TDX).

Enables or disables Software Guard Extensions (SGX).

Enables or disables SGX Factory Reset.

When [Enabled] is selected, it erases all registration data on subsequent boot, and additionally forces an Initial Platform Establishment flow when SGX is enabled.

Enables or disables Software Guard Extensions (SGX) Package Info In-Band Access.

SGX PRM Size is a constituent which may not be equal to the total PRM size.

If a CPU is installed that doesn't support SST, the Base option will be used regardless of the setting selected.

Bases: Effectively disabled SST.

Auto: The level of SST enablement is controlled automatically based on the number of CPU cores enabled in UEFI.

LLC prefetcher is an additional prefetch mechanism on top of the existing prefetchers that prefetch data into the core DCU and the MLC.

Enabling LLC prefetch gives the core prefetcher the ability to prefetch data directly into the LLC without necessarily filling into the MLC.

One of the four variables (IRQThreshold, StaleAtoS, CRQoSConfiguration, and L2RFOPrefetch) is used to optimize SAP HANA performance with 2-hop memory, such as 4-socket ring, 6-socket and 8-socket configurations.

[Auto] makes the L2 prefethcer less aggressive and lowers the NT write bandwidth.

[Disabled] limits burstiness and reduce snooping.

Enables or disables trust for the PECI (Platform Environment Control Interface) of the system.

Select [Disabled] if a higher level of security is required.

When [Disabled] is selected, some functions such as memory and I/O utilization reporting may not work.

Controls the minimum dwell time before a P-State change occurs.

Selecting a greater value results in effective operations

Selecting a smaller value results in better performance.

Enabling the CPU PCIe Relaxed ordering always allows the downstream completions to pass posted writes.

Enabling the PCH PCIe Relaxed Ordering always allows the downstream completions to pass posted writes.

Selects number of cores enabled within each CPU package.

The number "n" is the maximum core count supported by the installed processor.

Selects the desired UPI link frequency.

[Maximum performance] maximizes the performance.

[Balanced] offers a balance between performance and power.

[Minimal power] maximizes power savings.

When a preset mode is selected, the low-level settings are not changeable and will be grayed out. To change the settings, choose System Settings > Operating Modes > Choose Operating Mode > Custom Mode.

The maximum frequency (turbo, AVX, and non turbo) can be restricted to a frequency that is between the maximum turbo frequency for the installed processor and 1.2GHz.

The max frequency for N+1 cores can not be higher than N cores. If an unsupported frequency is entered, it will automatically be limited to a supported value.

If the CPU Frequency Limits are being controlled through application software, leave this feature at the default [Full turbo uplift] and change the settings by choosing System Settings > Operating Modes > Choose Operating Mode > Custom Mode > Turbo Mode > Enabled.

When [Enabled] is selected, Rocket Mode allows the cores to jump to max turbo instantly rather than on a smooth curve.

When Rocket Mode is enabled, it is only engaged when P-states are set to [Autonomous].

Controls the maximum nap time in C0 sub-state and control whether C0.2 is supported or not.

Controls the relative interrupt response time in C-States.

Al value 0x0000 means that the setting is not used.

Sets the desired power management level for the UPI interface. L1 saves the most power but has longer latency compared to L0p or [Disabled].

When a preset mode is selected, the low-level settings are not changeable and will be grayed out. To change the settings, choose System Settings > Operating Modes > Choose Operating Mode > Custom Mode.

The maximum frequency (turbo, AVX, and non turbo) can be restricted to a frequency that is between the maximum turbo frequency for the installed processor and 1.2GHz.

The max frequency for N+1 cores can not be higher than N cores. If an unsupported frequency is entered, it will automatically be limited to a supported value.

If the CPU Frequency Limits are being controlled through application software, leave this feature at the default [Full turbo uplift] and change the settings by choosing System Settings > Operating Modes > Choose Operating Mode > Custom Mode > Turbo Mode > Enabled.

Limits CPU physical address to 46 bits to support older Hyper-V.