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AMD Confirms +20*C Offset on Thermal Reading

AMD addresses some issues in its latest blog post including a thermal reading offset for the Ryzen 7 1800X and Ryzen 7 1700X

AMD recently posted in their community blog some additional information regarding Ryzen processors and how they handle a couple of things including Windows Power Options and the Temperature reporting. In the blog post, AMD addresses concerns regarding Thread Scheduling, temp reporting and Power Options. 

As it has been a hotly, no pun intended, debated topic. We’ll highlight temp reporting here and as AMD goes on to mention, the Ryzen 1700X and 1800X both feature a 20*C offset on its readings to compensate for fan policy uniformity across the product line. AMD advises users to subtract 20*C off their temp reading to know what their junction temperature is. AMD also confirms in this post that the temperature sensor on the Ryzen processors are located in the junction, the interface between the die and heatspreader.

Temperature Reporting

The primary temperature reporting sensor of the AMD Ryzen™ processor is a sensor called “T Control,” or tCTL for short. The tCTL sensor is derived from the junction (Tj) temperature—the interface point between the die and heatspreader—but it may be offset on certain CPU models so that all models on the AM4 Platform have the same maximum tCTL value. This approach ensures that all AMD Ryzen™ processors have a consistent fan policy.

Specifically, the AMD Ryzen™ 7 1700X and 1800X carry a +20°C offset between the tCTL° (reported) temperature and the actual Tj° temperature. In the short term, users of the AMD Ryzen™ 1700X and 1800X can simply subtract 20°C to determine the true junction temperature of their processor. No arithmetic is required for the Ryzen 7 1700. Long term, we expect temperature monitoring software to better understand our tCTL offsets to report the junction temperature automatically.

The table below serves as an example of how the tCTL sensor can be interpreted in a hypothetical scenario where a Ryzen processor is operating at 38°C.

Product Name True Junction Temp (Example) tCTL Offset for Fan Policy
Temp Reported by tCTL
AMD Ryzen™ 7 1800X 38°C 20°C 58°C
AMD Ryzen™ 7 1700X 38°C 20°C 58°C
AMD Ryzen™ 7 1700 38°C 0°C 38°C

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7 Comments

7 Comments

  1. Buddy Magsipoc

    March 14, 2017 at 11:38 am

    20C offset thermal reading ̶b̶u̶g̶ feature

  2. Jb Gwapo Odellot

    March 14, 2017 at 11:42 am

    Damn…Kaya pala ang taas ng Temps ko e..

  3. Juan Miguel Honorico-Lopez

    March 14, 2017 at 12:03 pm

    But I wanted to fry an egg!

  4. Leeranjit Abalon

    March 14, 2017 at 1:21 pm

    Aaron

  5. Carlo Infante

    March 14, 2017 at 5:56 pm

    so the nerf gun is lying all this time

  6. Noel Calara

    March 15, 2017 at 3:47 pm

    If I actually wanted to know how much heat is being generated, either I’ll have to spend five-six figures for a FLIR heat gun or stick an active thermometer kit that would cost me less than Php200.

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