For some reason in Windows my temp app shows my CPU can not going, but it is definitely going and shows up in BIOS, plus I took the side off and could see it going. You could possibly have a fan going bad or a bad sensor on the MB. I would try a different fan first if it was me. You shouldn't be getting to 80 degrees just in BIOS. Without overclocking I see a lot of people hovering around the 60ish temp, and that is doing stuff and idle temps in the 30s. In BIOS you should be seeing idle temps. If it is actually getting to 80 then you likely need a new fan. The stock Wraith cooler actually works pretty well, better than many after market coolers from what I have read. So if you have an after market cooler, try the stock one and see what happens.