The BIOS contains low-level hardware settings for your computer. This is where you can find options to enable Dynamic Voltage and Frequency Settings (DVFS) for your CPU.

Making changes to your BIOS can cause permanent harm to your computer. If you are unsure about what you are doing, please use the mw-feedback tool to make a support request. With some basic system information, we can give you instructions specific to your system.

To get to the BIOS, you will need to reboot your computer. Before the operating system begins to load, you have a moment to press a button to enter the BIOS settings. The button you need to press varies by computer and is generally displayed on the screen during the boot-up process. It is usually one of F8, F2, or Del.

Below are steps to take to enable DVFS on some known hardware. If your particular hardware isn’t listed, consult your manufacturer’s documentation.

How to enable DVFS control in the BIOS

Asus P5N32-E SLI (motherboard)

• http://dlsvr03.asus.com/pub/ASUS/mb/socket775/P5N32-E%20SLI/e2929_P5N32-E_SLI.pdf
• BIOS -> Extreme Tweaker -> Intel SpeedStep -> Auto
• Note: “AI Tuning” (BIOS->Extreme Tweaker->AI Tuning) must be set to “Standard”, “Auto” or “AI N.O.S.”

Asus P5N7A-VM (motherboard)

• AMI 0504
• BIOS -> Advanced -> CPU Configuration -> Intel(R) SpeedStep(TM) Tech -> Enabled

BIOSTAR NF61S Micro AM2 Ver. 1.0 (motherboard)

• http://www.biostar-usa.com/app/en-us/mb/content.php?S_ID=25
• BIOS -> CPU Settings -> Cool’n'Quiet -> Enabled

Dell Dimension 4500S

• http://support.dell.com/support/edocs/systems/dim4500s/
• No DVFS option in BIOS.

Dell Dimension 4550

• http://support.dell.com/support/edocs/systems/dim4550/
• No DVFS option in BIOS.

Dell Dimension 8200

• http://support.dell.com/support/edocs/systems/dim8200/
• No DVFS option in BIOS.

Dell Dimension 8400

• http://support.dell.com/support/edocs/systems/dim8400/
• No DVFS option in BIOS.

Dell Dimension E520

• http://support.dell.com/support/edocs/systems/dime520/
• BIOS -> Performance -> SpeedStep -> On

Dell Dimension XPS Gen 2

• http://support.dell.com/support/edocs/systems/dimxpsg2/en/index.htm
• No DVFS option.

Dell Inspiron 1525 (note there many different hardware specs under the same model number!)

• BIOS -> Performance -> SpeedStep Enable -> Enabled

Dell OmniPlex GX280

• http://support.dell.com/support/edocs/systems/opgx280/
• No DVFS option in the BIOS.

Dell OptiPlex GX620

• http://support.dell.com/support/edocs/systems/opgx620/
• No DVFS option in the BIOS.

Dell PowerEdge 1550

• http://support.dell.com/support/edocs/systems/ssabrepe/
• No BIOS option exists. If cpufreq does not get loaded by the kernel, then DVFS is not available on the box.

Dell PowerEdge 1750

• No BIOS option exists. If cpufreq does not get loaded by the kernel, then DVFS is not available on the box.

Dell PowerEdge 1850

• http://support.dell.com/support/edocs/systems/pe1850/
• No BIOS option exists. If cpufreq does not get loaded by the kernel, then DVFS is not available on the box.

Dell PowerEdge 1950 BIOS 2.3.1

• BIOS -> CPU -> Demand-Based Power Management -> Enable

Dell PowerEdge 2650

• http://support.dell.com/support/edocs/systems/pe2650/
• No BIOS option exists. If cpufreq does not get loaded by the kernel, then DVFS is not available on the box.

Dell Precision T5400

• http://support.dell.com/support/edocs/systems/wsT5400/en/index.htm
• System Setup -> Performance -> SpeedStep -> Enabled

Foxconn M61PMX motherboard

• http://www.foxconnchannel.com/product/Motherboards/detail_overview.aspx?ID=en-us0000381
• BIOS -> CPU Configuration -> Cool’n'Quiet -> Enabled

Gigabyte P35-DS3

• SMBIOS 2.4
• Award Software version F12
• BIOS -> Advanced BIOS Features -> CPU EIST Function -> Enabled

HP Compaq dx2200

• SMBIOS 2.4
• Phoenix Technologies MS7254 1.05
• BIOS -> Advanced BIOS Features -> E.I.S.T. (Enhanced Intel SpeedStep Technology)

HP Pavilion a600 Series

• http://www.hp.com/go/desktop-pc-docs
• No DVFS option exists.

HP Presario M2000

• http://h10025.www1.hp.com/ewfrf/wc/manualCategory?lc=en&dlc=en&cc=us&lang=en&product=433559&
• BIOS -> Advanced -> Device Options -> SpeedStep -> Enable

HP Presario V2000

• http://h10025.www1.hp.com/ewfrf/wc/manualCategory?lc=en&dlc=en&cc=us&lang=en&product=500508&
• No DVFS options listed in the manual, but Advanced Configuration and Power Management is supported.

HP Proliant DL380 G5

• SMBIOS 2.4
• HP bios version P56
• BIOS -> System Options -> Power Regulator for ProLiant -> OS Control Mode

HP Quasar 2 Motherboard

• http://support.packardbell.com/uk/item/index.php?i=instr_bios_quasar2
• No DVFS option exists.

IBM ThinkCentre A50 (model 8419)

• http://www-307.ibm.com/pc/support/site.wss/MIGR-51056.html
• No DVFS option exists.

MSI K9VGM-V Motherboard

• BIOS -> Cell Menu -> Cool’n’ Quiet control -> Enable

MSI PM8PM-V

• BIOS -> Advanced Chipset Features -> Intel(R) Speedstep‚Ñ¢tech -> Enabled

SuperMicro HaSMU nVidia MCP55 Pro chipset

• AMI BIOS 8.00.14
• BIOS -> Advanced -> CPU Config -> PowerNow -> enabled

SuperMicro X7DVL

• BIOS -> Advanced Processor Options -> Intel EIST Support -> Enabled