I'm also having similar issues with a new Intel Core I7-4790K and Gigabyte Z97X-UD3H. Using Boinc on Ubuntu 14.04 with Prime Grid tasks I get 90 - 100 C almost instantly. I've not let it persist and have had to reduce the Boinc CPU time to 45% to keep temperatures down. Even non-prime tasks can cause fairly high temperatures. Even with Boinc set for 45% CPU time I get temperatures over 70C. This is with a NOFAN CR-95C cooler, which is supposed to be adequate. What puzzles me is that the reported temperatures go up and down extremely rapidly. 90C temperatures appear to be dissipated in seconds and drop to 45C in a very short time.
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