WattTool 0.9.2 - overclocking video cards and tuning for mining

WattTool 0.9.2 Is a simple tool that combines overclocking with monitoring and VRM tuning for the RX 400 series of graphics cards

WattTool 0.9.2 - overclocking video cards and tuning for mining

Key features of WattTool:

  • A large number of settings and parameters for overclocking

  • VRM monitoring and tuning

  • profile support

  • Simplicity and compactness

Solving the most popular WattTool problems:

  • If you see the "Mutex creation failed!" Error, then you must run WattTool as an administrator. This is because other monitoring software, such as GPU-Z or HWiNFO, already works with administrator rights and has mutual synchronization exceptions. You can start WattTool as a regular user if you close these tools first and then restart them after WattTool.

Features of WattTool in more detail:

The GPU clock and voltage work similarly to WattMan. Clock pulses are not limited to increments of 5 MHz, but the voltage is limited to 6,25 mV steps (rounding mode is activated, so 976 mV will result in 981,25 mV).

The memory clock and voltage also work similarly to WattMan. The voltage is not the actual voltage of the memory, because it is set at about 1,5 V or requires a hard connection. The second circuit of the voltage controllers is not used, so it is doubtful that the memory controller has its own dynamic voltage plane. The voltage allegedly set here is simply the lower limit for the core voltage. If you are overclocking the memory, always check for memory errors, for example using HWiNFO.

Fan and power settings do not stand out. The minimum fan speed is not limited, you can set values ​​below the WattMan limit of 1040 rpm. Minimum revolutions are not used directly. Apparently, values ​​below 2200 are scaled by 2/3. Thus, for example, 2200 rpm gives 2200 * 2/3 + 300 = 1760 rpm.

Access to I2C: currently works only for IR3567B controller on line 4, address 8 on RX470 / RX480 boards. Synchronization occurs with other tools, such as GPU-Z or HWiNFO, which sometimes can lead to a loss of readings. This can affect performance and slow down even if you simply drag and drop the window on the desktop. Changes to I2C settings are not permanent. They will revert to their default values ​​after turning off the VRM.

Phase gain: The reference RX 480 has the first three phases of VRM connected to the 6-pin connector, and the remaining three phases connected to the socket. After measuring power consumption above 80 watts from the slots, AMD introduced a patch that shifts the load to the 6-pin connector. The default value for this is DDD000 (Hex). The maximum possible shift will be FFF000. Equal load distribution (000000) slightly increases the efficiency of VRM. We get the VRM temperature about 3 ° C lower from 000000, while the energy savings can be in the range of 2-3 watts. On non-reference cards, most phases are probably connected to an 8-pin connector, so changing this parameter is pointless.

Current scale: scales the current reported by VRM. On the RX480, the default value is 60 (hexadecimal). If you set it to 20, you will see that the GPU-Z reports half the power consumption. If you want to bypass the power limitation, it may be safer to use EMBD or a custom BIOS, for example, the unlocked air bios der8auer for reference cards designated by AMD.

Voltage Offset: Available from -300 mV to + 300 mV, however it is not tested over the entire range. Decimal input is multiplied by 6,25 mV. Thus, the valid range is from -48 to 48.


  • Profiles can be specified as command-line arguments for WattTool, or loaded and saved from the GUI.
  • Each video card needs its own profile. You can add multiple profiles as command line arguments.
  • The adapter index is the number from the drop-down list.
  • There is a NoGUI option that closes WattTool at a value of 1 after loading all profiles and does not start the graphical interface.
  • Profile sections are active only when the mode is set to Manual. Mode = Default restores the default settings for this section.

WattTool system requirements:

RX 400 Series Cards

Crimson version 16.6.3 or higher

Windows - so far tested only on Windows 10 pro 64bit and compiled with MinGW

In any case, use WattTool 0.9.2 at your own risk.

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