tufpistol

This takes me back to the days of the 2nd gen i5/i7 upgrades that were so popular then. I'd advised those seeking to upgrade then to go for an i7, arguing that 4C/8T would be better for the future, but as usual then, was shouted down by many who said the i5 4C/4T were better OC'ers, and were more than fine for games. I'd argued for more core + threads like the i7, also pointing out that the 8T i7's and were better bet than 4T i5's were safer for future usage, and that no matter how well the i5's OC, you simply can't magically OC and get the extra threads of the i7's. That's my philosophy now, more cores + thread counts (like the 9800K - 8C/16T, or r7 3700X 8C/16T) beats better OC'ed i5 (effectively) like the 8C/8T 9700K in the long run.
 
Bear in mind that future XBOX Scarlett games might be ported to PC, and may require more cores to work well, a possibility that should be thought about at the very least.

Which BIOS are you on?
 
What are the rest of your system specifications? Please list Power supply, GPU, Storage drive for Windows and any other storage drive, RAM.

before my delid, my 165w TDP cooler could BARELY handle a 4.8ghz OC in even light stress test like A64.

Most people with these CPUs have 200W-250W TDP coolers also. This cooler simply won't keep it below the temps you have OLU.

I'm just not certain what he's expecting. He's presenting his "issue" of not going to max turbo..... As someone with an i7-8700 and and i7-8700k, unless you manually go in and change the multiplier or enable MCE, the chip will likely stay at 4.3ghz max all-core (or EVER, actually.... There's always some background task that's usually occupying and forcing the all-core did) even if it has exotic LN2 cooling. 
 
If he has indeed set his multiplier to something higher, and it's not reaching that, it's probably because of his weak cooling.
 
Either way, it's a very strange scenario.
 
OP - given your cooling setup, my recommendation is to leave it at stock except try to undervolt it a bit to say 1.15-1.2v until it's stable.
 
That will probably prevent throttling at max stock turbo on that cooler.
 
Or if you learn a bit more, delid it and run it at 4.7ghz all-core and don't exceed 1.3v on that cooler.
 
Either way, do NOT run it at 1.4v with that cooler. Or at all.

I mean, it's still an 8700k more or less.
And you have a lower end cooler on it.

Thank you for posting the "Memory" profile screen shot as I requested. The SPD profile is only a list of your JDEC certified timings at XMP frequency settings. It is to help guide you with timings at different clock speeds. It appears your RAM is running at the correct speed.
 
For reference, the 8086 is a 6 core and 12 thread CPU, it basically is the 8700K. It's a limited edition to celebrate Intel's infamous 8086 processor from decades ago. Supposedly it's a binned version of the 8700K and thus a similar score should be expected. The cooler you are using is a low profile, slim fan cooler. The version I found online supports 100w TDP. This is seriously a small cooler for a small build. It isn't capable of handling overclocking for your chip. As another user noted, the only way to lower the temp for your chip with the same cooler would be a DELID. This is a complex procedure that risks the life of your CPU.

The 8086K is a power hungry chip. Please tell us what GPU you are currently using. As GPUs tend to be even more power hungry than the CPUs this way a system TDP may be determined. Also, what is the model number of your PSU? 650W total rating, or in some cases is a temporary rating, doesn't tell us enough to evaluate the situation. So please, what is your brand and model number?
 
Pistol

You need a Xy70 variant. The 70 series allows for more storage peripherals over PCIe or PCH. I believe the 500 series boards supports the most m.2 and SATA bandwidth. However, the x470 series boards are also excellent in this regard.
 
Top choice: X570 variant
2nd choice: X470 variant
 
Within your price range? Would have to run a comparison of all the many boards. At $200, the two boards that come to mind without running another comparison are the ASUS X570 TUF and ASUS X470 Strix-F.

Whatever cooler you have is not good enough for that CPU. I'd say go with a AIO 240/280/360 watercooler if you'd like to bring all cores speed up a  notch. Also you need to turn on XPM (xtreme memory profile) on the bios for the advertised RAM speed (it's the same as overclocking with a button).

Lose PCIe lanes? First I've heard of this. You do lose bandwidth as compared with PCIe 4.0.
Even the 2080 ti will not saturate PCIe 3.0x16 anyway.  The only gain I see from PCIe 4.0 is the m.2 drives (which I don't need). X470 is what I would buy if I was in the market for a new budget board. Otherwise X570 for newest tech.

You quoted the whole original post, but you didn't read it? OP already has the motherboard and reports that it works great, why would they get X570?

Only the first line says anything about problems, and that was that other people reported issues. Every other result looked peachy