I recently tried overclocking my CPU to 4.3 GHz and the first time I did it, was totally fine. The temp was around 40 degrees but after i woke up and tried overclocking it again, amd overdrive is telling my that it is 70 degrees, also I've experienced a few pc crashes as well. Should I be worried? I have an AMD 670k quad core processor 3.7Ghz, a GTX 960 2g SC and I have no idea what my fans are, I bought this computer from future shop and inserted a 500W PSU and the 960 into it.