Not sure why ASUS MY doesn't bring in the Code this time. It's a good board for those who want to have the appearance of the Formula but don't plan to go for custom loop and don't want to pay extra for the EK hybrid VRM heatsink/wb.
Hi bro, welcome to the OC club.
Your temps look normal at such CPU frequency, vCore and cooling.
D15 is the best air cooler that money can buy and it outperforms most AIO coolers. During my testing, with push pull fan configuration it performs on par with Cooler Master"s Nepton 240m  AIO. Some higher-end AIO coolers especially those 360mm will win by 1-5 degrees Celsius.
Wait for Corsair H150i 360mm AIO cooler to be released on Dec 31. I read Vortez's leaked review (before it went down) they claimed that it beats the NZXT X62 by 14 degrees C. But be prepared to pay around RM 1k for the price lol.

that is pretty low TBH, im getting 90c with a D15S and also dual fan setup, are you using the latest prime95?

avx instructions can generate quite a bit more heat. I believe that's why your temp is a lower than the other guy.

try one run with prime95 ver that supports avx and see, that'll show a sort of worst case scenario for the temps

I only have offset of -0.08v to the core voltage @ 4.7ghz and everything else is auto. but yea I'm using the latest prime95 which has avx instruction so my temps are like 90c on core3/4, 1.200v under load.

AVX offset has been a debatable issue since Kaby Lake. Some said it's a bug while others saying otherwise.
It could be that you have certain OS software running in the background that's using AVX instructions, triggering the AVX offset thingy. Here's the list of AVX-based software: https://forums.anandtech.com/threads/what-c...d-avx2.2498660/
Some games might be using AVX instructions, or NVIDIA driver itself is implementing it: http://www.overclock.net/t/1641867/avx-offset-bug
This doesn't happen with Skylake-X though or he needs more games to test: http://www.overclock.net/t/1643198/coffee-...ks-while-gaming
One guy said this bug is triggered when C-states are enabled in the UEFI: http://forum.gigabyte.us/thread/2704/psa-avx-offset-bug-real
I personally don't use AVX offset because I want my OC to be all out for worst case scenarios. 
Check out the OC guide in the top post of this thread for GIGABYTE's Z370 GAMING 7. It will guide you OCing your 8700K to 5GHz.

But I don't think you can comfortably run 5GHz OC with your current air cooling, unless you hit silicon lottery with a really low VID (stock voltage with everything defaults) and delid. So it really depends on good is your CPU which varies from one chip to another. Get a bigger and better cooler like the NH-D15/S or 240mm+ AIO.

It is advisable to check your VID through the UEFI first before proceeding for OC. Check your CPU core temps with your CPU running at stock clocks with Realbench v2.56, then only proceed for 4.7GHz on all cores and so on.

For record, my 8700K has 1.088v VID and it's capable to do 5.0GHz running under a high-end custom loop at 1.280v on Prime95 v29.3 custom blend 1344K.

[attachmentid=9470946]

Alright guys, currently I am testing my 5.0GHz OC on the Hero X with the an air cooler in the form of Noctua NH-D15S (2x NF-A15 fans).
To my surprise, for some reason I need to pump more voltage as compared to my custom loop.

[attachmentid=9470959]
Noctua NH-D15S: 1.328v, avg core temps: 39C Idle, 86C load
Custom loop: 1.280v, avg core temps: 37C Idle, 72C load

Yes that's right, 0.48v difference! 

At first I couldn't believe it so I re-tested using back my custom loop again I can confirm that there's no chip degradation in which I am still able to obtain stability at 1.280v under custom loop same like before, I don't know why LOL.

I understand that the lower temps, the lower the voltage required but seriously did not expect as much as 48mV.. .Funny LOL.
Guess something is not right when the temps go above 80C, don't know...

btw, Corsair H150i Pro RGB 360mm AIO cooler appeared in a recent LTT video. Seems like the launch is not today, but most likely to be released during CES 2018 that will be held in Las Vegas between 7-12/1/2018.

[attachmentid=9471095]

Those values are almost similar to ASUS's boards running at auto setting.
At DDR4-3200, I have mine defaults at 1.3v and 1.125v respectively but I decided to reduce the VCCIO to down 1.125v and I can still run it stably. As a result, my CPU temp can be reduced a bit. 

Errors pop up means your OC is not stable. Most likely is due to imsufficient voltage etc.
Try launching Prime95 under Administrator mode to fix the RAM usage issue.

Right click on the Prime95 icon on your desktop , run as Administrator.

The error pops up because you're attempting to stress a lot of RAM more than the available capacity.

Don't simply enter 14000 MB in the Prime95. Check your avaiable memory through the Windows Task Manager then only assign the capacity to stress.

Not sure if it's just me but there's a bug in the Prime95 that won't stress full RAM unless I run it in admin mode.

Post the SS here with P95 screen, task manager etc.
Stressing 10000MB looks kinda small for a 16GB RAM.
Should take 95%+.

Seems like the thermal results very from one review to another so I think we will need to read more reviews to compare. Different review sites used different CPUs and software to stress the coolers.

Mainstream Intel CPUs from Ivy Bridge till the newest Coffee Lake themselves have inefficient stock thermal paste and excessive gap underneath the IHS so these factors also need to be taken into the account. The thermal results won't be as accurate as the ones tested on the enthusiast-class CPUs (ie. 3930K etc) with soldered thermal interface. Furthermore, bigger chips like the 3930K have larger contact surface than the smaller CPUs.

G3D: performs similarly compared to Kraken X62 (based on 4790K)

Vortez: beats Kraken X62 by 13C (based on 3930K)

OC3D: outperforms Kraken X62 by 14.5C (7700K @ 5.0GHz)