Intel Core i3/i5/i7 Sandy Bridge CPU throttling

Intel Sandy-Bridge family i5 Core CPU, running Linux kernel 3.2 (Debian Squeeze/Wheezy), under heavy computation load, does not react to to cpufreq-set -g powersave (using acpi_cpufreq module). It is 99.9% time running in turbo mode, although it seems to be somehow throttled automatically, as can be seen in kernel messages (dmesg): ... [137547.968129] CPU2: Package temperature/speed normal [137547.968130] CPU0: Package temperature/speed normal [137548.124277] CPU2: Core temperature above threshold, cpu clock throttled (total events = 16455155) [137548.124280] CPU3: Core temperature above threshold, cpu clock throttled (total events = 16455154) [137548.125289] CPU2: Core temperature/speed normal [137548.125291] CPU3: Core temperature/speed normal [137847.287143] CPU2: Package temperature above threshold, cpu clock throttled (total events = 17888019) [137847.287147] CPU3: Package temperature above threshold, cpu clock throttled (total events = 17888017) ... I'd like to turn this CPU to power-saving mode, or choose the frequency, like with good old cpufreq powersave or userpace cpufreq governors. I wonder, what manual throttling method would work on these CPUs..