Oh when i was reading a guide from tomshardware it basically said you didnt want to push the cpu past 80 on a prime95 15 min test. To clarify i only ran prime95 withkut avx for 15 mins to check temperaturd stability of cpu then moved on to longer realbench tests. I passed an 8hr realbench test on this anyway. But now im currently talking to you on my. Other thread about stability undervolting which is doing weird things lol
The thing is about temps is they are a little open to what people perceive as hot. I've seen people saying ' my pc has been hitting 90c while gaming for the last year, do i have a problem?' - Yes they certainly do, but guaranteed someone will comment and say '90c is within spec for that CPU as it's limit is 100c etc blah blah blah'.
There's no way I would put up with any PC hitting 90c in normal use/gaming. Or 80c. Or even 70c. I like mine to be as low as possible at all times, that's why I'm using a 2011 Coolermaster HAFX full tower that only just fits under my desk and has every optional fan fitted.
Toms hardware says it shouldn't go past 80c on a 15 min test - I think that's confusing in a way as you should hit heat-soak (time to steady temp) in well under that and it should stay at that temp, so it shouldn't really matter how long it runs, it should stay at the same peak with a couple of degrees.
Even the largest air cooler hits steady state under full load in under 2 mins. And even the largest AIO loop should do the same in 4 or 5 mins.
I'd probably go with the fastest overclock you managed with the extra voltage (when it hit 79c how long had it been running?). Run a cinebench test to check that it actually performs better than it does one click lower on speed/voltage. If it's a higher Cinebench score I'd use in normal use/gaming and keep an eye on the temps.
You can always push a bit more when you upgrade the cooler. +0.031 volts isn't much, I needed +0.19 volts offset to hit 4.3ghz all cores on 3700x. I set an alarm in Coretemp to tell me if it hit 75c and it didn't, outside of stress testing.