I hope you have a better experience than PCPerspective -
"Much to my surprise, even on purely single-threaded workload, such as Cinebench R15 in Single mode, the processor wasn’t getting close to its 5.0GHz Single Core Turbo Boost frequency, in fact, I never saw it get above 4.5GHz. We corroborated these issues with another piece of CPU monitoring software, HWInfo64.
As you can see in the screenshot from XTU, the processor was sitting at a cool 48C while this was going on, and no other alerts such as the motherboard power delivery or current limit throttling were an issue during our testing.
Moving to another motherboard, the ASUS Strix Z370-H Gaming, again on the latest UEFI release, we saw the same behavior.
So far, we have been unable to get this processor to operate at the advertised 5.0GHz Turbo Boost frequency, on a multitude of different hardware and software setups.
However, if we manually overclock the processor, we can get an all-core frequency of 5.1GHz, although with a temperature around 85C."
techreport.com concluded the same -
"As an actual processor, the i7-8086K
isn't worth the $75 upcharge over the i7-8700K at stock speeds. Outside of its rarely-seen 5-GHz top Turbo bin, the i7-8086K performs the same as an i7-8700K the vast majority of the time. That's because the rest of its Turbo Boost 2.0 table is identical to the i7-8700K's. There's only so much a chip can do within the same thermal budget. It would have been nice to see Intel really take the leash off this thing and push TDPs or implement something like its Thermal Velocity Boost feature on this chip to truly make it something special for those who don't want to overclock.
The story changes a little—and I do mean a little—when we take advantage of the i7-8086K's unlocked multipliers. It's tricky to recommend a processor on the basis of its overclocking prowess alone, because no two chips will overclock alike. That said, our retail i7-8086K made it to 5.1 GHz on all cores without any AVX offset and nothing more than the usual thermal challenges of modern Intel CPUs. No i7-8700K in our labs can run at speeds higher than 5 GHz for non-AVX workloads, and they require -2 AVX offsets to remain stable.
For all that, the i7-8086K's slightly higher overclock didn't translate into many practical performance benefits in our tests versus a run-of-the-mill 8700K at 5 GHz. Still want to pay that $75 extra?"
).
