Indeed it seems a dangerous assumption, considering the Intel Software Developer's Manual explicitly says it's not true... > For [big list of models]: the time

Indeed it seems a dangerous assumption, considering the Intel Software Developer's Manual explicitly says it's not true... > For [big list of models]: the time-stamp counter increments at a constant rate. That rate may be set by the maximum core-clock to bus-clock ratio of the processor or may be set by the maximum resolved frequency at which the processor is booted. The maximum resolved frequency may differ from the processor base frequency, see Section 18.7.2 for more detail. On certain processors, the TSC frequency may not be the same as the frequency in the brand string. (Vol 3B § 17.17 / PDF page 3443 https://software.intel.com/content/www/us/en/develop/articles/intel-sdm.html https://software.intel.com/content/www/us/en/develop/article...)