How to Undervolt the Core 2 Duo
- 1). Download and install RMClock and Orthos. RMClock is the program that will be used to undervolt the Core 2 Duo and is free of charge for non-commercial use. Orthos is Core 2 Duo stress test program; it works by making the processor work at full speed for as long as you run the test. It then shows results of the test letting you know if everything worked correctly.
- 2). Open RMClock and go to "CPU info." Open Orthos, select "Blend - Stress CPU and RAM," then click "Start." Run the test for 10 minutes and look at the "Core Temp" display in the RMClock window you have open. This will show temperatures of more than 90 degrees Celsius. Click "Stop" in Orthos and exit the program.
- 3). Click "Advanced CPU settings" in RMClock. Select "Mobile" under "Misc Intel Core 2 family settings" if it isn't already selected. Check "Apply these settings at startup" and click "Apply."
- 4). Expand "Profiles" in the left column in RMClock. Select "Performance on demand." Check "Use P-state transitions" for both "AC Power" and "Battery." Check each of the multipliers in the boxes under "Use P-state transitions."
- 5). Click "Profiles" and change "Current Profile" to "Performance on demand." Check all the "Indexes" in the box and uncheck "Auto-adjust intermediate states VIDs." Lower the voltage of "Indexes" above "0" by one to two steps (Don't change it by more than two steps at a time or your system may become unstable). Click "Apply."
- 6). Click "CPU info" and run Orthos again. Let Orthos run for about 40 minutes to give it time to check for errors. If there are no errors, you can drop the "Indexes" in the above step by one or two more steps and test again. Continue this process until the voltage is lowered down to but not lower than "Index 0" and tests properly. If Orthos causes a failure at any time, raise the "Index" levels back up a step or two and test again. Shut down Orthos when you have reached your optimal undervoltage level for the Core 2 Duo, RMClock will need to stay on to keep the undervolt process active.
