{"id":10,"date":"2023-03-09T15:28:00","date_gmt":"2023-03-09T15:28:00","guid":{"rendered":"https:\/\/stephenleng.com\/en\/?p=10"},"modified":"2025-01-26T23:45:34","modified_gmt":"2025-01-27T04:45:34","slug":"how-to-understand-intel-cpu-turbo-boost-power-time-window","status":"publish","type":"post","link":"https:\/\/stephenleng.com\/en\/how-to-understand-intel-cpu-turbo-boost-power-time-window\/","title":{"rendered":"How to Understand Intel CPU\u2019s \u201cTurbo Boost Power Time Window\u201d?"},"content":{"rendered":"\n

This is the official description of the setting item, \u201cTurbo Boost Power Time Window,\u201d from XTU (Intel\u00ae Extreme Tuning Utility):<\/p>\n\n\n\n

\n

The Time window over which the average CPU core power must be below the Turbo Boost Power Max<\/strong>.(PL1 Time)<\/p>\n<\/blockquote>\n\n\n\n

This setting item is not related to \u201cTurbo Boost Short Power Max\u201d for two reasons: 1) After disabling \u201cTurbo Boost Short Power Max,\u201d this setting item can still be adjusted, but \u201cTurbo Boost Short Max\u201d can no longer be set; 2) The abbreviation of this setting item is PL1 Time, not PL2 Time, indicating that it is only related to \u201cTurbo Boost Power Max.\u201d<\/p>\n\n\n\n

\"\"\/<\/figure>\n\n\n\n

On my Intel i7-8565U, this setting item can be set between 0.25s and 96s, but can not be 0s.<\/p>\n\n\n\n

Based on my tests, when I set this time window to 96s and the \u201cTurbo Boost Power Max\u201d to 8W, and ran XTU\u2019s Benchmark, the TDP initially maintained a power of about 19W for approximately seven seconds, then dropped to 8W, and even dipped to 4-5W at one point, before fluctuating around 8W. When I set the time window to 0.25s, the TDP fluctuated around 8W from the beginning, with relatively smaller variations.<\/p>\n\n\n\n

Thus, the \u201cTurbo Boost Power Time Window\u201d is essentially a tolerance level for the CPU to exceed the \u201cTurbo Boost Power Max.\u201d<\/strong> The shorter the power time window, the less likely the CPU will exceed that power; conversely, the longer the power time window, the more likely the CPU will exceed that power.<\/p>\n\n\n\n

For instance, when the time window is set to the lowest value of 0.25s, it means that for every 0.25s cycle, the average TDP of the CPU cannot exceed the \u201cTurbo Boost Power Max\u201d you have set. In such a short time cycle, you won\u2019t experience the CPU exceeding the \u201cTurbo Boost Power Max\u201d at all. If the time window is set to the highest value of 96s, it means that the average TDP of the CPU cannot exceed the \u201cTurbo Boost Power Max\u201d for each 96s cycle. This allows the CPU to run at high power for a few seconds before falling back. Since the average power consumption in each 96s cycle cannot be higher than the \u201cTurbo Boost Power Max,\u201d the CPU must sometimes operate below that power level.<\/p>\n\n\n\n

In summary, the longer the time window, the more the CPU\u2019s TDP fluctuates around the \u201cTurbo Boost Power Max,\u201d and the shorter the time window, the less the CPU\u2019s TDP fluctuates around the \u201cTurbo Boost Power Max.\u201d<\/p>\n","protected":false},"excerpt":{"rendered":"

This is the official description of the setting item, \u201cTurbo Boost Power Time Window,\u201d from XTU (Intel\u00ae Extreme Tuning Utility): The Time window over which the average CPU core power must be below the Turbo Boost Power Max.(PL1 Time) This setting item is not related to \u201cTurbo Boost Short Power Max\u201d for two reasons: 1) After disabling \u201cTurbo Boost Short Power Max,\u201d this setting item can still be adjusted, but \u201cTurbo Boost Short Max\u201d can no longer be set; 2) The abbreviation of this setting item is PL1 Time, not PL2 Time, indicating that it is only related to \u201cTurbo Boost Power Max.\u201d On my Intel i7-8565U, this setting item […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"fifu_image_url":"","fifu_image_alt":"","_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_post_was_ever_published":false},"categories":[5],"tags":[6],"class_list":["post-10","post","type-post","status-publish","format-standard","hentry","category-technology","tag-intel"],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"jetpack-related-posts":[{"id":119,"url":"https:\/\/stephenleng.com\/en\/the-substantial-foundation-of-work-life-balance-high-quality-private-time\/","url_meta":{"origin":10,"position":0},"title":"The Substantial Foundation of Work-Life Balance: High-Quality Private Time","author":"Stephen Leng","date":"09\/03\/2025","format":false,"excerpt":"The phenomenon of extremely long working hours\u2014more than 40 hours per week\u2014exists in both the United States and China. 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