i see some variance.... mine varies from 43c to 47c.... and the CPU follows this temperature...
When i power up tha PC, and the system is still cool enough, it starts from 31c, and after 5 minutes it rises at 43~45c...
I think i don't have a bad sensor... i think it's just the high room temperature... I got almost 35c room temperature, so i think it's possible to have 43~45c when the PC case is closed...
Anyway, in general, the mobo is great, and it offers what it promises!!!
Please, excuse my english. I am Italian