i7-4790k Temperature limits

Ambient room temps will play a factor in your idle/load temps. Having a 28c room vs a 22c room will increase temps all the way around. 33-34c doesn't sound abnormal for idle temps but that's only part of the cooling. The other is keeping things cool under load. 84-85 is getting pretty hot. Still at the upper limits of 'safe' for a limited stress test (certainly wouldn't want to run it for extended periods at those temps).

Is your cpu overclocked automatically using a 'boost' or 'performance' option in the bios? I know you said you didn't overclock it but sometimes people don't always realize that 'performance' settings in the bios can sometimes be mild overclocks. If it's failing a test (in this case due to being above the test's thermal limits) it means it's not really considered stable. The program didn't necessarily 'crash' like a bsod but didn't pass within the set margins either. Using a program like hwinfo64 you should be able to see what your current vcore is.

For instance here's a screenshot of hwinfo64 on my pc and I've highlighted where the cpu's vcore is listed. The sensor data page is a bit of a scroll so you may have to scroll down to get to the data but it's there. You'd want to look under max values to see what the vcore rises to under full load, in my case it's 1.284v (my cpu is overclocked).
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Usually best to keep it under 1.3v if possible for every day use. The more vcore the higher the temps will be so reducing this could help your thermal issues and get the temps down. It's also possible that the bios may automatically be pushing a bit higher vcore than what your cpu requires, with the 4790k some have a higher default vcore than others. Manually changing it and lowering it some would be the best option, along with stress testing to make sure it's stable. Reducing the vcore for the selected multiplier can cause instability and bsod crashes. Another good program to use along with occt is rog realbench. You may also want to try prime95 v26.6 (older version) with small fft's for a steady workload on the cpu for thermal testing. See if you get different temps, sometimes linpack can be pretty brutal.