Ethereum update: [Guide] How to use NVIDIA Inspector to properly undervolt your cards
There’s a less known program called NVIDIA Inspector that can be used to undervolt your cards down to 650-700mV with no hashrate drops. This is perfectly safe, shaves a few degrees off the GPU temperature and lowers the power draw, even compared to regular power limit undervolting.
You need:
* [NVIDIA Profile Inspector](https://ci.appveyor.com/project/Orbmu2k/nvidiaprofileinspector/build/artifacts)
* [NVIDIA Inspector](http://www.guru3d.com/files-details/nvidia-inspector-download.html)
1) Completely uninstall MSI Afterburner, Sapphire Trixx or any other overclocking software – you will not need them and they might interfere with the other tools.
2) Open **NVIDIA Profile Inspector**, scroll down to **5 – Common** and set **CUDA – Force P2 State** to **OFF**. Press **Apply changes** on the upper right corner and close the tool. [Example here](http://developernote.com/wp-content/uploads/2017/11/nvidia-profile-inspector.png).
3) Create an empty .bat file in the same directory as NVIDIA Inspector, open it in Notepad and add this:
SET VOLT=650000
SET MEMORY=500
SET CORE=100
SET GPU0=-lockVoltagePoint:0,%VOLT% -setBaseClockOffset:0,0,%CORE% -setMemoryClockOffset:0,0,%MEMORY%
SET GPU1=-lockVoltagePoint:1,%VOLT% -setBaseClockOffset:1,0,%CORE% -setMemoryClockOffset:1,0,%MEMORY%
SET GPU2=-lockVoltagePoint:2,%VOLT% -setBaseClockOffset:2,0,%CORE% -setMemoryClockOffset:2,0,%MEMORY%
nvidiaInspector.exe %GPU0% %GPU1% %GPU2%
Modify the core and memory offsets, add as many GPUs as you want, just make sure you change the ID of the card when copying the line. **Note that you need to subtract 200 (500 on GTX 1080 and 1080 Ti) from your old memory offset because you have disabled the memory clock throttling from P2** – if you’ve used +700 in Afterburner, you’ll need to write it as 500 in the .bat file.
4) Run the .bat file and check the hashrate. If any of the cards shows lower than expected hash – first try to manually increase the core offset. If it is still low – keep the highest possible core offset and increase the card’s voltage by starting from 650000 and increase by **12500** up until the hash is normalized.
5) Finally – increase the memory clock per card if you want to fine tune the overclock.
GPU1 with custom voltage and offsets should look like this:
SET GPU1=-lockVoltagePoint:1,675000 -setBaseClockOffset:1,0,180 -setMemoryClockOffset:1,0,300
Notes:
1) You need to reapply the P2 disable tweak on every GPU swap and driver reinstall.
2) 1050~1070Ti need 1200-1300MHz effective clock speed to avoid hashrate drops. 1080 and 1080 Ti need 1500~1600MHz.
3) Don’t touch the power limit, leave it on 100%.
4) If you don’t disable P2 state, your rig might crash or freeze while running idle on desktop, network connection is off, or the miner stops working. Disabling P2 is highly recommended if you value max overclock and stability.
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Author: hetfield37
Score: 81
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