For the next 1-2 years you are served with 6 cores.
If you are planning for the next 5-6 years, then 8+ cores.
The game engines are developing in the direction of more cores.
Skylake-X, Ryzen 7 or wait and see...
i7-8086k is exactly the i7-8700k simply the better chips and thanks to the bios it clocks normally at 5Ghz the 8700k you have to overclock.... but normally also goes to 5Ghz. The 90Fr surcharge is not worth it.
You can always wait because the better one is just around the corner.... But I get by very well with 6 cores. But you can also buy the normal i7 8700k. It's exactly the same, the only two differences are: it clocks 0.3GHz less. But you can easily get that out with an overclock & the software badge (e.g. CPU-Z has a special edition).
Nothing different from pre-selected 8700k. For those who have bad ones, it makes sense to get an 8086k. According to reports and forums, all are good and do great. Never forget cooling, that is the be-all and end-all of CL. Me with my 8700k doing 1,152 for 5ghz will have a hard time beating one of those.
If you also play WQHD, I think you'll do very well with 6 cores for the next 4 years... and I mean after 4 years you can buy a new one. Let's hope that the DD4 Ram will still be there.
Wait for 8800k. The new 6-core is maybe 1-3% better than the 8700k, which you can sometimes get for 370. You'd rather spend 100 more on a better graphics card.
Since the final specifications of the 8 core have not yet been released, this question cannot be answered across the board. Engineering samples seen so far indicate a significantly lower base clock (only 2.6 Ghz, turbo on single core then perhaps 3.6 - 4.0 Ghz). Current games generally need fewer cores (but there should be at least four), but more clock speed. An 8086K or even an 8700K should therefore deliver better performance in the vast majority of current games. But as I said, that's all crystal ball reading. First the final specs have to be published, better still benchmarks if there have been architecture changes.
I think you can also take an AMD Ryzen 2700X processor and build the computer with it. The i7-8086K is only a modified processor in terms of clock speed, which is only 300-400Mhz higher and you pay almost 100 Fr. extra for this (whether it's worth it?).
In any case, the 2700X is already a very good competitor here compared to the normal i7-8700K where you can even see the difference in price. I'm very satisfied with this processor and it ran very well from the start, with 16MB cache it has enough to run many programs in the background without me noticing that the performance is in the basement. Also, you have eight cores on the 2700X, which would probably be relevant for future things. The price also includes the cool Inbox RGB fan on the 2700X, which impressed me that it comes with one.
I'm not saying that you "absolutely" have to get an AMD 2700X, but you can decide from here whether to get this one or that one.
I also don't know if Intel will use another chip set for their new upcoming processors or refresh versions (Z390 has already been confirmed by Asus and maybe Z400 in the future?).
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