Hi Guys,
I know this is an ongoing thing with this motherboard, indeed I also experienced it at one time. I use 2 x Intel® Xeon® CPU E5-2670 0 @ 2.60GHz and every now and again I would get the 100c spikes as mentioned, or the fans would spin up to full and only a reboot would solve the issue.
However, by some miracle I found a cure for it and I'm not sure if anyone else is using this, but I installed IPMI plugin and set up thresholds and since then I haven't' experienced the spikes or the fans running at full speed. Just to give you an idea, the fans would spin up to full every 10 days or so and the server required a reboot, but I've now been running the IPMI plugin for several months and not once have they spun up to full speed and stuck there. Ok, due to the thresholds I have setup they do spin up faster every now and again but that is due to the ambient temp rising, but they never go full pelt these days.
I'm so glad I found a solution to this as it was driving me nuts when the fans spun up to full speed, sounded like a jet engine taking off.