I'll give a brief tutorial on the Cheat Engine method. I've got most of the kinks worked out and it's not as hard as I thought is was going to be. There's some things I don't like about it. But it does work. Well...it works for me. Hopefully it will work for you too. We'll see...
DISCLAIMER
I take no responsibility for any damage you might cause while applying excessive overvoltage. You do this mod/tweak AT YOU'RE OWN RISK! I also make no claims as to the safety of using Cheat Engine 6.7. I don't know how safe it is. I don't know if it will cause any harm to your system to install and use it for these purposes. It seems to be safe and harmless so far as I can tell. I've had no problems using it. I would, however, advise that you make a backup of your system or at least create a system restore point before even installing it.
Requirements
Cheat Engine 6.7
MSI Afterburner 4.2.0
Procedure
Install AB and CE. Be careful when installing CE so that you don't get stuck with PUPs(Potentially Unwanted Programs).
Click where it says
Click here.
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Uncheck the boxes for programs you do not want to install. Then click next.
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Download the attached MSIAfterburner.ct file below. Then go to Documents and place the MSIAfterburner.ct file in the My Cheat Tables folder.
Open AB and CE. Apply clocks and voltages to your choosing in AB. I assume you want more than +100mV Core Voltage and will have that applied.
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Click the computer w/ magnifying glass icon in CE. Then select and open MSI Afterburner from the Process List.
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Click Yes to load the associated MSIAfterburner.ct table.
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Click on the Core Voltage slider so the Apply checkmark becomes available. If just clicking on the slider doesn't work, move it back and forth.
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Click on the 100 under Value for Core Voltage1. Change value to 200(for +200mV) and click OK. Do the same for Core Voltage2.
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It will now look like this if you did it correctly.
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Click the Apply checkmark in AB. You will see the Core Voltage (mV) slider limit change from +100 to +200 and the Core Voltage display will show ~100 more mV has been applied(see how it went from 944mV to 1047mV). Don't worry about the Value of Core Voltage2 changing to 100(if it does), that doesn't matter.
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Congratulations! You just raised the AB Core Voltage limitation from +100mV to +200mV. You can use the same process to raise the Memory Voltage limit. And the Aux Voltage limit if you want to. You just need to find the Addresses for Aux Voltage first. I can explain how if required. If you want to use different values just plug them in instead. If you run into any problems just ask and I'll try to help you with it.
When you're all done tweaking you can close CE. You MUST leave AB open or the voltage tweak(s) will stop working. Minimizing AB is fine. If you move the voltage slider(s) and hit Apply the voltage tweak(s) will be removed. If you don't want the OSD displayed in apps/games you need to open RTSS and turn it off.