Do you use 2700 or 2700X?
There's a new patch for 2700X:
commit 1b59788979acd230b9627276c76f6e6ba2c4709c
Author: Guenter Roeck <li...@roeck-us.net>
Date:   Tue Apr 24 06:55:55 2018 -0700

    hwmon: (k10temp) Add temperature offset for Ryzen 2700X

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https://bugs.launchpad.net/bugs/1774817

Title:
  Temperature sensors on x470 not reporting correctly

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  x470-I ROG strix motherboard and Ryzen 2700

  After
  sudo sensors-detect
  and answering yes to all the probes the net result is:
  "Sorry, no sensors were detected.
  Either your system has no sensors, or they are not supported, or
  they are connected to an I2C or SMBus adapter that is not
  supported."

  sensors output lists:
  asus-isa-0000
  Adapter: ISA adapter
  cpu_fan:        0 RPM

  nouveau-pci-0900
  Adapter: PCI adapter
  fan1:           0 RPM
  temp1:        +65.0°C  (high = +95.0°C, hyst =  +3.0°C)
                         (crit = +105.0°C, hyst =  +5.0°C)
                         (emerg = +135.0°C, hyst =  +5.0°C)

  k10temp-pci-00c3
  Adapter: PCI adapter
  temp1:        +94.2°C  (high = +70.0°C)

  Where the cpu fan is patently wrong and the k10temp likewise. The
  nouveau-pci-0900 appears to be the actual CPU temperature.

  May be related to:
  https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1740736

  Other info:
  Description:  Ubuntu 18.04 LTS
  Release:      18.04

  version log:
  Ubuntu 4.15.0-22.24-generic 4.15.17

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