29 December 2011

fix overheating laptop / pc with undervolting processor

undervolting is the process of reducing the excessive voltage to the CPU by using the software. Undervolting does not affect performance at all. affecting performance is the overclock and underclock. Undervolting is not equal to underclocking.

Not all the same processor, each processor models have different voltage tolerances. Intel put on a standard voltage stable (and high) to each chip. The problem is the manufacturer of very high standard voltage. Undervolting try to tune to the lowest stable voltage.

Undervolting process takes a long time, because we have to find the lowest stable voltage for each multiplier on the CPU. Multiplier associated with SpeedStep technology, cpu works full power each time, the multiplier is used to dynamically adjust the cpu clock. (sign multiplier: 6x, 7x, 8x, etc).

* For now, Atom processor, ULV and i-core can not be undervolt.

you need:

1. RMClock v2.35 (main program for undervolting).
2. Orthos CPU Loader (using that to stress test the CPU and look for voltage stability).
3. HWMonitor or everest (to see the realtime of CPU temperature).

* for 64 bit OS will have to download special drivers. copy and paste into the installation folder RMClock. another link.

check Max Temperature before undervolt

First we must achieve the max cpu temperature.
1. open HWMonitor, see the temperature for the cpu, if there are 2 cores it will indicate the temperature of each core.
2. Open Orthos, select "Small FFTs-stress cpu".
3. Click Start on Orthos, and run for 10 minutes, check your cpu temperature rises in HWMonitor.
4. after 10 minutes, click Stop to stop the test, record the max cpu temperature.

Installing and Setting RMClock

1. install RMClock
2. run RMClock
3. click the tab on the left of "Advanced CPU Settings", refer to the settings in the screenshot and click "Apply".

* AMD users need to check a "P-State Transistors" for a better undervolt

setting Profile

1. Open Profiles -> Performance on demand as in the screenshot.
check "Use P-State Transitions" and then check all the "Index" checkbox at the bottom, click Apply.

2. Open Profile tab (main profile).
select performance on demand for AC Power and Battery, check all Normal-type multiplier. if your cpu showed SuperLFM and IDA, uncheck. click Apply.


1. starting from the largest multiplier (see screenshot above),
at the screenshot looks default voltage is 1.1750V
we have to do is to lower the voltage, and voltage stability test page, do it gradually.
0.025V lower voltage per phase until it finds an unstable (in the stability tests below)

2. to reduce the voltage of each, click Apply. if not, the new setting will not affect.

3. To find the voltage at the lower multiplier, uncheck the higher multiplier. who already have a stable voltage.
(cpu, it will only work at max clock multiplier in the earlier check)

stability Test

1. Open Orthos and HWMonitor
2. Open the tab "CPU Info" in RMClock (to see the temperature and cpu clock)
3. Orthos set to "Small FFTs-stress cpu".
4.Start Orthos for 45 minutes.

* On the stage who seek a stable voltage, 10-15 minutes is sufficient.

* If the voltage is not stable, then your laptop will experience a BSOD (Blue screen) or Error on Orthos.
do not panic if it appears the BSOD, restart your laptop normally.

* After making finding the voltage is unstable, increase the voltage 2 level and then run back to stability tests
(Voltage is stable so it will then be used for the multiplier).

* For stable voltage is recommended to run a stability test for longer, 1-3 hours.

save and apply

after all multiplier gain stable voltage, RMClock settings at windows startup:

* Profile tab in RMCLock: select "Performance on demand" for Startup and current, click Apply.
* Tab settings: Check "Start minimized in the windows tray" and "Run at Windows startup", click Apply.

credit to crayonyes(kaskus), flipfire(NBR Forum) and I've been tested.

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