AMD's R7 1800X and 1700X report higher temperatures with a 20 degree offset

AMD's R7 1800X and 1700X report higher temperatures with a 20 degree offset

AMD's R7 1800X and 1700X report higher temperatures with a 20 degree offset

AMD's R7 1800X and 1700X report higher temperatures with a 20 degree offset

 

AMD's R7 1800X and 1700X report higher temperatures with a 20-degree offset, which means that only the R7 1700 is reporting the correct CPU temperatures at launch.   

In Ryzen CPUs AMD places their thermal sensor "T-Control/tCTL" at the interface point between the CPU and the heatspreader, sensing what is called the junction temperature (Tj). With the AMD R7 1700X and 1800X AMD uses a thermal offset of 20 degrees to force higher fan speeds on fan speed/thermal curves, making these CPUs list thermals that are hotter than they actually are.  

Below is a table which showcases these offsets, explaining why users of the R7 1700 are reporting much lower thermal results than the R7 1800X and 1700X, as these are reporting higher thermals.  
 

Product NameTrue Junction Temp (Example)tCTL Offset for Fan PolicyTemp Reported by tCTL
AMD Ryzen™ 7 1800X38°C20°C58°C
AMD Ryzen™ 7 1700X38°C20°C58°C
AMD Ryzen™ 7 170038°C0°C38°C

   

This explains why initial reviews for the 1800X reported that Ryzen could run at 80+ degrees without their coolers getting hot to the touch, as their CPUs were, in reality, running at around 60 degrees with AMD's Ryzen Master utility reporting higher thermals.  

In time, it is expected that software will be updated to better report Ryzen's thermals and we hope that AMD will officially reveal more details on their CPU's thermal limits soon. 

 

You can join the discussion on AMD's R7 1800X and 1700X reporting CPU temperatures that are 20 degrees hotter than reality on the OC3D Forums.  

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Most Recent Comments

14-03-2017, 06:45:11

Korreborg
Why don't they report this at first?

Now they get "bad" OC reviews, instead of telling about it upfront.Quote

14-03-2017, 06:52:59

tinytomlogan
Even I dont understand it. Its f'n retardedQuote

14-03-2017, 06:53:19

WYP
Quote:
Originally Posted by Korreborg View Post
Why don't they report this at first?

Now they get "bad" OC reviews, instead of telling about it upfront.
It really depends, this does not necessarily mean that we suddenly have 20 degrees of additional thermal headroom. For all we know this may mean that Ryzen's thermal limit is around 70 degrees and not 90.Quote

14-03-2017, 07:00:09

Korreborg
It's just. When i as a casual overclocker sees 80+, it means no more volts.
If the real temp is 60 then ill try a bit more volts, and maybe get stable at 100 extra MHz.Quote

14-03-2017, 07:04:10

Tolemac
Whats needed is AMD to set out a guide on how to work out "safe temps" for the 1700X and 1800X if this is the case.Quote
Reply
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