Dear /g/. Im sorry for making separate thread, but Im too c

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Dear /g/.

Im sorry for making separate thread, but Im too confused about CPU coolers and their performance.

When I was buying new PC like three weeks ago, I thought I dont have to spend too much money on cooler and got SilentiumPC Fera 3 - model claimed to have performance level of CM Hyper 212 Evo, one of the most popular models on various build threads. According to producer, it was supposed to work well with max TDP of 180, so I expected it to be enough for i7-6700k.

But despite that I installed it correctly, it reach rather disturbing temperatures during work, as shown on pic. Note that this is NOT stress test, it is just running some CPU intensive task (which just happened to be a game, more CPU heavy than GPU).

At first I thought I need a better cooler and checked internet for reviews of popular model of Noctua NH-U12S. Techpowerup (www.techpowerup.com/reviews/Noctua/NH-U12S/6.html) tested it on i7-3960X ES (TDP of 110W) and at 100% load and overcloked to 4,1Ghz, it reached 66C. Sounds okay for me.

But when I searched for review of water cooling Corsair H80i, on the same site (techpowerup.com/reviews/Corsair/H80iGT/6.html), tested with i7-4770K, overlocked to 4,2 Ghz (TDP 84W), it showed 83C on max load, with NH-U12S with 91C! CM 212 Evo was also on the chart, with 95C!

Im extremely confused right now, /g/. How I should interpert TDP values, if CPUs with similar frequency but lower TDP reach much higher temps than CPU with higher TDP? How can I find out, which cooler would be safe for i7-6700k?

Just in case somebody would be curious - case I use is Corsair 200R and mobo GA-Z170-HD3P. Max cooler heoigh for case is 160 or 165mm, so Im afraid that very large models would not fit.

Thank you for any reply, advice or help.