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Wa_emtcontenttype: "emtcontenttype:salesandmarketingmaterials/marketingarticles", Yep, its settings (enable/disable) are indeed software controlled (as well as settings of all the other technologies except for the catastrophic shutdown detector), but its behaviour is completely automated (on the hardware level) and you can easily see that from our tests.Wa_rmarketingproducts: "rmarketingproducts:processors/intelcoreprocessors", It's not quite clear why Intel calls this technology "software controlled". The picture on the right shows further increase of duty cycle to 100% (that is complete ODCM blackout), which is accompanied by increased throttled CPU clock. This processor acts a bit differently – on the left screenshot you can see a steady growth of duty cycle from 12.5% to 50%, which results in no changes in throttled CPU clock and means that the minimum possible duty cycle of a processor is 50%. Throttled CPU clock varies within 647–2800 MHz (at the Here you can also see that ODCM canīe successfully used together with Enhanced SpeedStep. When a CPU gets loaded – even the minimum load, you can see The result is very interesting – in almost idle mode the throttled CPUĬlock drops to 785 MHz (approximately 23% of the actual CPU clock, Illustrative) and set the maximum modulation level – from 12.5% We'll use the CPUMSR utility again to examine the software controlled modulation.Īt first, let's take a Xeon Nocona processor (its results are more The main parameters in control of this technology – enable/disable and specified minimum level of CPU duty cycle (from 12.5% to 87.5% at 12.5% steps, it also has a reserved value). Software controlled on-demand clock modulation is indicated by the ACPI flag in CPUID, it can be controlled using processor MSR IA32_CLOCK_MODULATION. We deliberately left this technology for the end – as we have demonstrated above, this very technology (at least its basic principle) is used as a basis for all the other performance/power consumption management technologies in Pentium 4 and Xeon processors. Performance and Power Consumption Control Features in Intel Pentium 4 and Intel Xeon Processors – Different Names, the Same Principles « Performance and Power Consumption Control Features in Intel Pentium 4 and Intel Xeon Processors – Different Names, the Same Principles