X99 Taichi Xeon Tjmax |
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CPL0
Newbie Joined: 13 Feb 2017 Status: Offline Points: 18 |
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Posted: 13 Feb 2017 at 1:44am |
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CPL0
Newbie Joined: 13 Feb 2017 Status: Offline Points: 18 |
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Xaltar
Moderator Group Joined: 16 May 2015 Location: Europe Status: Offline Points: 22688 |
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Tjmax determines when the CPU will throttle or shut down due to heat as I am sure you know. If ASRock set it lower or higher than intel's default rating it is likely due to testing and study of the CPU's behavior on that particular BIOS version. Coded changes in the BIOS can drastically effect temps and performance, it is not uncommon for manufacturers to allow a cushion or buffer by lowering the Tjmax limit slightly, this goes a long way to protect your CPU from sudden spikes that could shoot the temps over the Tjmax limit and damage the CPU.
CPU temp changes have been a lot more abrupt since manufacturing processes have gotten smaller and dies more dense. Where in days of old we would see CPU temps rise say 20c over a few seconds we now see them spike from 30c to 90c almost instantly. The lower than rated Tjmax makes sense in this scenario. Out of curiosity, why would you want to alter the Tjmax setting? It would only be an issue if you are using inadequate cooling.
Edited by Xaltar - 18 Feb 2017 at 3:05pm |
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CPL0
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Xaltar
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Thanks for the correction
In that case I am not sure, you could try contact Tech Support directly and ask. http://event.asrock.com/tsd.asp I have heard the term and seen it about but until now have never really looked into it. My quick google search clearly failed me I do know that typically TJmax used to only be a fixed value on mobile CPUs (socket 2011 too?), either way I have not encountered any issues regarding it before. Please let us know if you get an explanation, I am sure there will be others wanting to know. Based on your info under reading temps could prove troublesome, even if it is only by +/- 5c.
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CPL0
Newbie Joined: 13 Feb 2017 Status: Offline Points: 18 |
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I'm not going to chase Asrock up, I'll look into it myself when time permits. Thanks for the reply, appreciated.
Actually the old mobile core 2 duo's had an undocumented DTS calibration register that could be used to change the temperature report. Just a bit of trivia FYI. ;) |
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Jhon19
Newbie Joined: 28 Sep 2020 Status: Offline Points: 4 |
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Now i see, why if i changed CPU tj max in z490 motherboard on Uefi from Auto i got wrong temperature on each core, it's show me about 80 C - with 0% processor load, and 28 C in package. How can it fix? Or better using Auto mode ? |
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