The new board did absolutely nothing to improve their OC. Looks like they got a dud 7700K.
"It’s a little hard to fault Intel at all for wanting to push a little more out of its revised core, as we found an extra 200MHz of overclocking capability in the Core i7-7700K. And because the Z170A Gaming Pro Carbon’s firmware functioned a little more smoothly than the previously-used model,
I was even able to boot it at 5.00GHz, only to find that it wasn’t stable enough to run Prime95 at any frequency above 4.80GHz. And yes, I did try more voltage.
Other findings include that at 4.80GHz and 1.30V, the MSI-based platform still drew a mere 170W, and the CPU reached only 86°C. That extra thermal headroom is exactly what I needed to play around with more voltage, before finding that
4.80GHz is the best OC setting for this Core i7-7700K sample."
The vdroop on this board is ridiculous. I reckon once dialed in, I'll likely be looking at 5Ghz @ 1.4v (need to play around with offsets and LLC).
A better motherboard should be able to unlock the full potential of this processor. The Asrock Z170 Pro4S is pretty much bottom of the range / full on budget board after all. I'll await a decent Z270 to satisfy my inner geek.
There should be a setting for Load Line Calibration, try setting it to level 2. Then play around with it to see how much the voltage dips in GPU-z under Prime 95.
So you think 50c with a 5.0Ghz overclock is a high temp?? Heck I would be more then happy with those temps.Specially with air cooling cause upgrading to water the temp will only get better!! Could you try lowering the volts with the 5.0Ghz overclock? I would like to see what is needed for a stable overclock for running 24/7.
Edit..
Just seen your new post, those temps gotta be wrong. There is no way your hitting 89c without melting something.Also your volts are showing 1.36 volts I thought you were running it at 1.40v??
Modern Intel CPUs can do 99-100C
http://www.techspot.com/article/927-temperature-impact-cpu-performance/
Conclusion
The results of our testing can pretty much be summarized with the following three points:
- Modern Intel CPUs run at full speed (including the full Turbo Boost allowed based on the number of cores and workload) all the way up to 100 °C
- Even after the CPU hits 100 °C, the performance is not greatly affected until the CPU spends about 20% of the time > 99 °C
- While stock cooling only causes around a 2.5% drop in performance, even a budget after market cooler will dramatically improve CPU temperatures