My apologies for replying to an old topic but has this ever been resolved? I've relied on Speccy for many years for my temperatures but it's recently been reporting 55C+ when idle on my CPU and this concerned me.
I noticed that some tech YouTubers use HWMonitor PRO so I downloaded HWMonitor (not the PRO) and I can confirm that the GPU and Storage devices report the correct temperatures but the CPU isn't quite right.
Speccy at the current moment is reporting a very consistent 57C on all 8 cores of my Ryzen 7 1800x CPU but HWMonitor is reporting a 37 to 46.