Unless you are running your PC in a controlled env with the same room temperature as your comparison you gain nothing.
BIOS temps shouldn't be higher than CPU load temps in Windows, but should be higher than idle temps in Windows.
40C is nothing for silicon, that's why it is used.
If it gets over 85C consider doing something about it.
Glad to hear I just needed to make sure before I load my OS and fry my shiny new CPU. Thanks for the quick reply