I don't know why you think 75c is when you need to start worrying. Both my 4790K and 7820x ran over 75c for years with no issues and that's with liquid cooling - on the stock coolers you can find people running them at 85c. I also find it weird that 75c is when "you need to start worrying" but under a torture test this only hits 72c. The average temps in gaming will probably be far under that. Seems way better than normal for a stock cooler and that's also the conclusion most reviewers come to.