Does CPU heating to 90 C cause any permanent damage? I have a MacBook Air 6,2 (2013) with an i7 (1.7 GHz normally). When I was installing Debian on it I completely forgot about the "Turbo Boost" feature — my CPU was clocked at its highest possible value, and consistently reaching 80-90 degrees. I've since clocked it back but I just wanted to make sure it didn't hurt anything.
The i7-4650u has a max operating temp of close to 100c so you were pushing it close but it should be fine.