MSI boards are bad about this. I've got an A75IA and if I sit in the bios too long both the CPU and the system temps creep up to near full load temps. The temps actually do seem to climb up a fair piece too as if I sit in the bios for awhile then boot into windows and quickly start a hardware monitoring program I can watch the temps go back down to where they belong at idle.
I wouldn't be over concerned with what the bios is telling you temperature wise. Go ahead and get your OS installed and see what the utilities start telling you there.
Note: The CD that came with the board will probably have a program called MSI control center on it. When I asked MSI about the bios temps, the tech told me to go by what control center was quoting over what the bios reads.

I wouldn't be over concerned with what the bios is telling you temperature wise. Go ahead and get your OS installed and see what the utilities start telling you there.
Note: The CD that came with the board will probably have a program called MSI control center on it. When I asked MSI about the bios temps, the tech told me to go by what control center was quoting over what the bios reads.