Intel X79 Motherboard Overclocking Guide


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UEFI and VRM Adjustments

The options below are advised for moderate to high level overclocking (generally up to 4.6GHz) In addition for frequency scaling at or in excess of 4.8GHz the settings below are also initial starting values.

ClockGen Full Reset – Enabled

*ClockGen Full Reset Enabled means to shutdown and power up at the selected BCLK. Usually this is best for overclocking since you may not be able to adjust more than 3MHz of BCLK from post BCLK. If you wish to though, you can disable it and thus save and exit with BCLK changes without shutdowns. Also if you plan to change BCLK in the OS and do not want shutdowns and power ons at resets, set this to disabled.

CPU Clock Gen Filter – Enabled

CPU Load-Line Calibration – This setting is advised to be set to medium or potentially high (depending on maximum load and draw this setting provides for compensation against droop. In most situations a selection of medium will provide a 1 to 1 voltage setting (example setting 1.400v provides 1.400v). Please be aware that the reading in software is only approximate as depending on the location of super I/O controller and power plane)

Consider switching to 10UF should you pushing higher memory speeds or higher memory frequencies.

CPU Current Capability – Recommend 120% (exceeding this value will not produce additional heat or draw. This defines the limitation on current flow when the board will shut off. Be advised that when exceeding 130% voltage, temperature and current at these levels are potentially a long term concern and can affect the lifespan of the board and CPU. For 140% the corresponding level should not generally be used for 24/7 operation.

CPU Vcore Boot Up Voltage – Can be a key voltage in helping to extend CPU frequency when attempting to post / boot a higher frequency.

Such as defining 1.500 vid to boot but only needing 1.480 vid when under load for stability.

Anti Surge Support – This setting is advised to be disabled when exceeding 4.7GHz this is due to the fact this protection mechanism monitors overall current draw / as current draw under aggressive multi threaded stress tests can easily exceed 180watts as such this can trigger a shutdown independent of instability. The super I/O controller can tell the active different between the draw of a high overclock or a potential spike, surge etc. Please ensure it is disabled at aggressive overclocks.

CPU Power Phase Control – This setting will impact power draw at idle and mid load states. ASUS phase switching implementation by default will initialize and load all phases automatically when under high/100% load. Values such as Standard, Optimize or Extreme will providing superior power delivery (while producing more heat) when light to moderate loading is present. This is important to consider when defaulting to a consistently higher frequency and not using PerCore overclocking or using a multiplier above 47x.

Standard - Will default to normal Intel phase switching policy 1 to 4 phases. (advised for up to 4.3 GHz)

Optimized - Will offer phase switching in fine increments relative to phase count (1, 2 , 4, 6 , 8 , 10 , 12 etc) This setting is advised up to 4.8GHz and matches well when speedstep and other active c states are enabled.

Extreme - Will offer the maximum performance and power delivery but will yield the most heat. Extreme is only advised when high multipliers are at fixed values without speedstep or c state options enabled.

CPU Power Duty Control – Will define how balancing occurs across the VRM/Phase array.

T.Probe – Will offer temperature based load limiting hotspots and improving thermal efficiency and heat output while still yielding excellent power delivery. This setting as advised for frequencies of 4.7 to 4.8GHz or below.

Extreme – Will offer current based load balancing providing highest power delivery but will producing the most heat (at idle, moderate and heavy load). This setting is only advised when at our exceeding multi values of 48x.

Specific VRM options for DRAM scaling and ensuring stability

DRAM Current CapabilityDirectly controls OCP limits for memory. This setting is advised to be set at 120% (when defining 1600 or greater speeds). When potentially heavily loading memory should adjustment not be present in extending OCP limits dram may fail and cause stability issues once current is heavily requested.

DRAM Power Phase Control – Controls phase switching policy for DRAM phase array. Should memory be operated at or below 1600 defaults are advised. At 1600 or greater it is advised to enabled and define optimized or extreme.

Voltage Scaling Considerations and Quick Setting for 4.8GHz attempt.

Quick Note regarding Voltage Scaling – Vid for frequencies varies considerably between CPU to CPU. In addition it is strongly advised offset values be used for superior efficiency, reduced heat output

  • For X and K series parts, the stock voltage supplied will allow for consistent overclocking generally up to a multiplier of 40x to 41x.
  • Increased range between 42 to 46x multipliers will generally require a voltage range between 1.240 to 1.475V with an LLC recommended setting of med.
  • Increasing the range between 46 to 50x multiplier will generally require a voltage range between 1.410 to 1.525+ with a LLC recommended setting of med to high.


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