Изменить частоту FSB. Как?

CPU governor 'performance' set.

CPU frequency : 1995.05 MHz (estimated)
PLL slg8sp513 is supported (tested)

Run as root?
Is module i2c_dev loaded?
Is i2c module for your chipset loaded?
Is i2c support enabled in kernel?

Changing to:
FSB=140 MHz, PCI=35.00 MHz

Run as root?
Is module i2c_dev loaded?
Is i2c module for your chipset loaded?
Is i2c support enabled in kernel?
Can't change frequency, SetFSB error: No such file or directory

CPU frequency : 1995.01 MHz (estimated)
FSB=140 MHz, PCI=35.00 MHz

CPU governor '' set.
cpufreq-set: ключ должен использоваться с аргументом — «g»
cpufrequtils 008: cpufreq-set (C) Dominik Brodowski 2004-2009
Report errors and bugs to cpufreq@vger.kernel.org, please.
invalid or unknown argument
Usage: cpufreq-set [options]
Options:
  -c CPU, --cpu CPU        number of CPU where cpufreq settings shall be modified
  -d FREQ, --min FREQ      new minimum CPU frequency the governor may select
  -u FREQ, --max FREQ      new maximum CPU frequency the governor may select
  -g GOV, --governor GOV   new cpufreq governor
  -f FREQ, --freq FREQ     specific frequency to be set. Requires userspace
                           governor to be available and loaded
  -r, --related            Switches all hardware-related CPUs
  -h, --help               Prints out this screen

Notes:
1. Omitting the -c or --cpu argument is equivalent to setting it to zero
2. The -f FREQ, --freq FREQ parameter cannot be combined with any other parameter
   except the -c CPU, --cpu CPU parameter
3. FREQuencies can be passed in Hz, kHz (default), MHz, GHz, or THz
   by postfixing the value with the wanted unit name, without any space
   (FREQuency in kHz =^ Hz * 0.001 =^ MHz * 1000 =^ GHz * 1000000).

	Max Speed: 4096 MHz
	Current Speed: 2000 MHz
	Speed: Unknown
	Speed: Unknown
	Speed: 800 MHz
	Speed: 800 MHz

	External Clock: Unknown

i2c_algo_bit           13413  1 i915

sudo lfsb -y slg8sp513 171
CPU governor 'performance' set.

CPU frequency : 1995.05 MHz (estimated)
PLL slg8sp513 is supported (tested)

Changing to:
FSB=171 MHz, PCI=34.30 MHz
Can't change frequency, SetFSB error: Connection timed out

CPU frequency : 1995.01 MHz (estimated)
FSB=171 MHz, PCI=34.30 MHz