On Voltages - If they are in left field, they are INCORRECT. programer has the pointer set to the wrong loacation and/or the algorthium to convert is incorrect. ie if +12 V <9 V or > 16 You Know they are incorrect.
On temps. If program uses incorrect TJmax (not sure if AMD uses a Tjmax) then temp will be off by that amount. I find for Intel systems HDMonitor is correct for temps, but often incorrect for Voltages. Speed fan seams good for temps.
Added, I'm an Intel guy. Does the AMD provide individual core temps. Screen shot does not display indivdual core temps which are more important than "averaged temp"