Difference between revisions of "K10ctl"

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[[Category:Power management (English)]]
[[Category:Power management]]
[[Category:Daemons and system services]]
[[Category:Daemons and system services]]

Revision as of 16:00, 23 April 2012

k10ctl allows you to overclock and undervolt an AMD K10 processor (e.g. Phenom, Phenom II) by changing its P-States.

Lowering the voltage saves energy and leads to less heat and noise.



k10ctl is available in the AUR: k10ctlAUR


Note: cpufreq must be configured properly.


# For information how to calculate the following values see:
# http://www.ztex.de/misc/k10ctl.e.html#c1

# Change to "true" after you configurated the settings for your CPU
# WARNING: Be SURE that the following values are correct and safe for
# your system before doing this!

# Number of cores for your CPU

# List of P-states you want to change.
# NOTE: all following arrays must have the same size!
PSTATES=( 0 1 2 3 )

# List of Northbridge VIDs
NBVID=( 45 45 45 45 )

# List of CPU VIDs
CPUVID=( 36 45 55 68 )

# List of CPU FIDs
FID=( 12 5 0 0 )

# List of CPU DIDs
DID=( 0 0 0 1 )


k10ctl needs the kernel module msr, so run

# modprobe msr

Now you have to find out the default values of the P-States for your CPU.

# k10ctl 0-3

0-3 are the CPU cores so if you have less, decrease the second number.

Adjust your config with the correct numbers from the output.

Tip: The important lines are "P-State 0" - "P-State X".

When you are sure everything is correct, set "CONFIGURATED" to "true" and restart k10ctl:

# /etc/rc.d/k10ctl start

Up to now k10ctl should work with the default values of your CPU.

How to calculate values

Check "VID interface mode" to know how to calculate your settings.

# k10ctl 0-3 -> first line

Parallel VID interface mode:

 if vid>=64 then U=375 mV
 else if vid>=32 then U=1162.5mV - vid=12.5 mV
 else U=1550mV - vid*25 mV

Serial VID interface mode:

 if vid>=124 then U=0 mV
 else U=1550mV - vid*12.5 mV

Finally you can modify your P-States in /etc/conf.d/k10ctl.

Note: All arrays in the config must have the same size.

Restart k10ctl and check "k10ctl 0-3" again.

# /etc/rc.d/k10ctl start
# k10ctl 0-3


Add cpufreq + k10ctl to DAEMONS=() and msr to MODULES=().

Tips and tricks

Use mprimeAUR to test the stability of your computer.

If it's stable, decrease the values, else increase them.

If your computer freezes and you can't adjust the values, start the Fallback kernel and modify the config.