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System Setup Screen | BIOS Attribute Name | BIOS Default Setting | Description |
System Profile Settings | System Profile | Performance Per Watt (DAPC) | Enables you to set the CPU power management mode. The Dell Active Power Control (DAPC) mode enables BIOS to manage the processor power states. DAPC helps achieve performance/watt maximized at all utilization levels and workload types, while still meeting performance requirements. The Maximum Performance mode keeps the processor running at the highest frequency all the time. The Operating System Demand Based Power Management (OD DBPM) means that it is the Operating System that controls the processor’s power management. |
| CPU Power Management | System DBPM (DAPC) | The CPU power management setting in the BIOS of a Dell PowerEdge computer allows you to set how the CPU is power managed. The default setting is usually System DBPM (DAPC), which stands for Demand-Based Power Management. Other options include: OS DBPM, Performance per Watt (DAPC), and Performance per Watt (OS). |
Memory Frequency | MaxPref | The speed at which the memory bus operates. The maximum possible frequency in the system may not be the maximum frequency rated on the installed DIMM. The maximum memory bus frequency depends on:
In most profiles, except the Dense Configuration Optimized profile, the BIOS configures the memory bus frequency to the maximum possible frequency. Under the Custom menu, a memory frequency can be selected for the required value. The selected frequency cannot exceed the maximum possible frequency for the system. It is limited by the capabilities and configuration of the system as noted. | |
Turbo Boost | Enabled | If the operating environment allows, Turbo Boost mode allows the processor to engage to a higher frequency than the processor’s nominal or rated frequency. This results in higher system performance. Turbo Boost is engaged on a per-socket basis. If some of the cores of a socket are idle, then other cores of the same socket can go to a higher processor performance state | |
C1E | Enabled | Enable or disable the processor to switch to C1E (Enhanced Halt State) when it is idle. | |
C State | Enabled | Enable or disable the processor to operate in all available power states. | |
Write Data CRC | Disabled | When set to Enabled, DDR4 data bus issues are detected and corrected during ‘write’ operations. Two extra cycles are required for CRC bit generation which impacts the performance. | |
Memory patrol Scrub | Standard | Patrol Scrubbing is a feature that searches the memory for errors and repairs correctable errors to prevent the accumulation of memory errors. | |
Memory Refresh Rate | 1x | The memory controller will periodically refresh the data in memory. The frequency at which memory is normally refreshed is referred to as 1x refresh rate. When memory modules are operating at a higher-than-normal temperature or to further increase system reliability, the refresh rate can be set to 2x. | |
Uncore Frequency | DynamicUFS | Selects the Processor Uncore Frequency. Dynamic mode allows the processor to optimize power resources across the cores and uncore during runtime. The optimization of the uncore frequency to either save power or optimize performance is influenced by the setting of the Energy Efficient Policy. | |
Energy Efficient Policy | BalancedPerformance | Selects the Energy Efficient Policy. The CPU uses the setting to manipulate the internal behavior of the processor and determines whether to target higher performance or better power savings. | |
Monitor/Mwait | Enabled | Enables you to enable/disable the Monitor/Mwait instructions of the processor. When set to disabled, these two instructions are not supported by the processor. Note: Monitor/Mwait can be disabled only when C state is disabled in Custom mode. When C state is enabled in Custom mode, changing this setting does not impact system power or performance. | |
CPU Interconnect Bus Link Power Management | Enabled | When enabled, CPU interconnect bus link power management can reduce overall system power a bit while slightly reducing system performance. | |
PCI ASPM L1 Link Power Management | Enabled | When enabled, PCIe Advanced State Power Management (ASPM) can reduce overall system power a bit while slightly reducing system performance. |
BIOS Attribute Name | Default Setting |
APS rocketing | Disabled |
CPU C1 Auto Demotion | Enabled |
CPU C1 Auto UnDemotion | Enabled |
Dynamic L1 | Enabled |
Energy Efficient Turbo | Enabled |
GPSS Timer | 500us |
OS ACPI Cx | OS Cx C2 |
Enabled | |
Scalability | Disabled |
Workload Configuration | Balance |