Since Nvidia driver Geforce version 185.XX, perflevelsrc is no longer used for controlling GPU throttling.
In Driver Version 19X.XX the GPU performance control is in the control panel.
If your graphics card is running overheating frequently when monitored using HWMonitor and you happen to be using Nvidia Graphics this post is for you
Note:
PowerMizer is a feature created by Nvidia to save power and reduce heat on Graphics Card
PowerMizer is built into all the graphics card
It is optional for Desktops because Desktops have infinite power from Wall Sockets and manage heat well
However it is very essential for Notebooks as they have to conserve power and produce less heat when no intense graphical application is running
Run “Regedit”
Go HKEY_Local_Machine\SYSTEM\CurrentControlSet\Control\Video\{ Your graphics adapter}000 and 0001
To locate the registry entry expand all the entries until you see one with lots of registry setting That will be the the registry containing your Graphics Options
Right click on the right Window to create a new DWORD 32bit value
The value name change to “PowerMizerEnable” value select “1″ in hexidecimal
Repeat
The value name change to “PerfLevelSrc” value data “3333″ in hexidecimal
Reboot
Verified using GPUZ and HWMonitor
The Result
After PowerMizer is activated successfully you should see the GPU Clock drop below default clock at idle
Optional:
If you want finer control over PowerMizer change “PerfLevelSrc” values to achieve desired effect
- PerfLevelSrc=0×2222 - fixed PowerMizer mode (and appropriate fixed frequency) is used for battery power source and fixed PowerMizer mode is used for AC power source, these PowerMizer modes may be the same or different
- PerfLevelSrc=0×2233 - fixed PowerMizer mode is used for battery power source and adaptive clock frequency strategy is used for AC power source
- PerfLevelSrc=0×3322 - fixed adaptive clock frequency strategy is used for battery power source and PowerMizer mode is used for AC power source
- PerfLevelSrc=0×3333 - adaptive clock frequency strategy is used for battery and AC power sources
