BSOD never happens from CPU temp, when things get too hot (100°C) you get a simple shutdown, just like pulling the power. I don't think there is any way to modify the BIOS control of the CPU fan. You can sometimes get better temps by replacing the thermal paste between the heatsink and CPU but it's usually better to replace the whole cooling block with a higher quality one, liquid cooled or a bigger heatsink. 80°C is pretty much a normal temperature for heavy gaming and nothing to worry about.

The BSOD on the other hand is a worry, unless it only happened the one time. If you are seeing it too often write down the particulars and report back, we can try to diagnose whether it's hardware or software.