Hardware Prefetcher:
This BIOS option allows the enabling/disabling of a processor mechanism to prefetch data into the cache according to a pattern-recognition algorithm In some cases, setting this option to Disabled may improve performance. Users should only disable this option after performing application benchmarking to verify improved performance in their environment.
Adjacent Cache Line Prefetch:
This BIOS option allows the enabling/disabling of a processor mechanism to fetch the adjacent cache line within a 128-byte sector that contains the data needed due to a cache line miss. In some cases, setting this option to Disabled may improve performance. Users should only disable this option after performing application benchmarking to verify improved performance in their environment.
High Bandwidth:
Enabling this option allows the chipset to defer memory transactions and process them out of order for optimal performance.
Data Reuse:
Enabling this BIOS option reduces the frequency of L3 cache updates from L1. This may improve performance by reducing the internal bandwidth consumed by constantly updating L1 cache lines in L3. Since this results in more fetches to main memory, setting this option to Disabled may improve performance in some cases. Users should only disable this option after performing application benchmarking to verify improved performance in their environment.
Logical Processor:
This BIOS setting enables/disables Intel's Hyper-Threading (HT) Technology. With HT Technology, the operating system can execute two threads in parallel within each processor core.
Execute disable:
This is a security feature designed to prevent certain types of buffer overflow attacks by enforcing specific areas of memory that applications can execute code. In general, it is best to leave this option Enabled for the security benefits, as no real performance advantage has been detected by disabling this feature in BIOS
Virtualization technology:
When this option is enabled, the BIOS will enable processor Virtualization features and provide the virtualization support to the OS through the DMAR table. In general, only virtualized environments such as VMware ® ESX™, Microsoft Hyper-V ® , Red Hat ® KVM, and other virtualized operating systems will take advantage of these features. Disabling this feature is not known to significantly alter the performance or power characteristics of the system, so leaving this option Enabled is advised for most cases.
Node Interleaving:
This BIOS option allows the enabling/disabling of memory interleaving across CPU nodes. When disabled, each CPU chip can only access memory within its own node.
CPU Power Management:
This BIOS setting allows configuration of various demand-based switching schemes. Maximum Performance maintains full voltage to processor internal components, even during periods of inactivity, eliminating the performance penalty associated with the phase transitions between high and low load.
Memory Frequency:
This BIOS setting allows the memory to be clocked to the highest supported frequency.
Turbo Boost:
Intel Turbo Boost Technology is a processor feature which allows the processor to transition to a higher frequency than the processor's rate speed if the processor has available power headroom and is within temperature specifications. Disabling this feature will reduce power usage but will reduce the system's maximum achievable performance under some workloads.
C States:
Enabling the CPU States causes the CPU to enter a low-power mode when the CPU is idle.
System Profile:
This BIOS option sets the performance and power management aggressiveness for the system. It is a collection of selections including a custom selection designed to allow customers to choose the ideal operating profile for their server system environment. It includes settings like CPU Power Management, Memory Frequency, Turbo Boost, C1E and C States.
Memory Patrol Scrub:
Memory Patrol Scrub Patrol Scrubbing is a custom System Profile option feature that scans the memory for bit errors and corrects them whenever possible. When set to Disabled, no patrol scrubbing will occur. When set to Standard Mode, the entire memory array will be scrubbed once in a 24 hour period. When set to Extended Mode, the entire memory array will be scrubbed every hour to further increase system reliability.
Snoop Mode:
Selects between the three processor cache coherency snoop modes.
Energy Efficient Turbo:
Enables/disables the Intel Energy Efficient Turbo Boost type.
C1E:
Enables/disables the provision for the processor to switch to its minimum performance state when idle.
Collaborative CPU Performance Control:
Enables/disables the joint OS-System CPU power management control feature.
Memory Refresh Rate:
Selects the frequency at which the system memory controller performs the DRAM technology data refresh operation.
Uncore Frequency:
Selects the running frequency of the CPU internal uncore.
Energy Efficient Policy:
Selects amongst the CPU internal performance/power state weightings.
Monitor/Mwait:
Enables/disables use of the CPU opcodes defined to provide more efficient system software thread synchronization between multiple agents.
CPU Performance:
If supported by the CPU, Hardware P States is a performance-per-watt option that relies solely on the CPU to dynamically control individual core frequency.