To verify what the software is stating, check the temps in the actual system BIOS before the computer loads the OS, during POST. The mobo temp is typically read from the northbridge on the motherboard which controls RAM, video, and CPU. Some chipsets run hotter than others but 80+ temps isn't normal for anything I'd say; you def want to check it out.
There is usually a heat sink placed on the northbridge in which you may be able to reseat if you pull the motherboard out. Perhaps applying new thermal compound and reseating the sink will provide better temps. If you are overclocking the motherboard, you may need to reset the settings to default so that the NB voltage is within factory spec.