When using Speccy for my Asus P8 H67 M, it reports the motherboard temp as 89 - 90C. However, I fail to believe that it true.
The Asus UEFI utility reports the temp as ~ 33 -34C, which happens to coincide with 90-ish F.
I'm am not an expert, however I believe the MB would not get that much warmer than the 31C of the CPU, which is running and correctly (I think) reported as 31C.
I've attached a screenshot, for what it is worth.
Conversion error, somewhere?
This would not stop me from using this very useful utility, but I figured that I would report it.