I'm encountering this issue as well, nearly identical hardware here too:
2500k / P8P67 EVO / GeForce GTX 460 / 12.10 / 3.5.0-22-generic x86_64
Oddly enough I only started noticing this when I upgraded my RAM today.
Previously I had G.Skill RipJaws 16GB (DDR3-1066 7-7-7-18 1.5v 4GB x 4)
and by default core 0 of my CPU would not throttle (remain at 3.3GHz)
but the other 3 would per my Munin graphs. However when I replaced the
memory with G.Skill Ripjaws Z 32GB (DDR3-1600 10-10-10-30 1.5v 8GB x 4)
for some reason none of the CPU's would throttle (scaling_min_freq would
default to 3301000).
I found this bug and can resolve this on my end as well by manually
setting the correct value. I find it a bit strange that the RAM upgrade
triggered a change. I did go into the BIOS when I upgraded it but only
checked the speed settings and didn't touch anything with the CPU.
If anyone else finds this useful I put a small bit of code in my
rc.local to automatically fix this:
MINFREQ=$(cat /sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_min_freq)
for cpu in `find /sys/devices/system/cpu/ -maxdepth 1 -type d -regex
'.*/cpu[0-9]+'`; do {
echo $MINFREQ > $cpu/cpufreq/scaling_min_freq
} done
Thanks.
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https://bugs.launchpad.net/bugs/704567
Title:
Wrong scaling_min_freq set for Intel Sandy Bridge Processors
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