Link 

AMD explains temperature-related concerns on Ryzen 7 1700X and 1800X
For me this is not good at all.
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".
 
 
Not sure I would call this a small bug in a CPU.

Another thing to remember is that this is a radically new CPU architecture for AMD, and these smaller bugs will be ironed out in due time - not as a "red shill", but it's the absolute truth. On top of that, we have the motherboard manufacturers not having enough time to tweak their boards - with all of this flowing into the market now, the fixes will be quick and swift.
 
Good thing Intel is not like this for the most part that is.
 
Some more on Temps AMD gets defensive over criticisms of Ryzen processors Under "Not so hot"
Good line up as well Link Funny Name for a Web URL!!!!

I am still going with a Custom Water Loop on mine but not sure how I should set the Temp Controls.

Sajin
Interesting. So the temps read wrong in software & bios?

On the 1700X and 1800X they add an offset of 20 degrees Celsius. This offset was used so that all their cpu's have the same fan profile. Which I personally think is stupid. Which means that the monitoring software will have to be smart enough in the future to go. You have and 1800X and subtract 20 from the Tjunction temperature. 
 
I really don't get why they did that and instead just didn't create separate fan profiles.