Would moving from a 6700K to 8700K be a substantial upgrade for high end gaming?
mostly the 2 extra cores
Currently single core performance and clockspeed is more important than having more than 4c/8t. A 6700k is able to reach 4.4-.4.6 GHz on air in most cases and the 7700k 4.6-4.8 GHz. The 8700k would need to reach stable 4.8-5.0 GHz on air to be considered a worthwhile 6700k replacement, if you want to play at very high frame rates (90-144 Hz) . The two extra cores will be a nice way to "future proof" your build though, because games will probably start to better utilize more than 4/8 threads in the coming 2 years.
Long story short: For high fps it will depend on coffee lakes single core performance. People on 6700k/7700k CPUs can probably stay on them for the next 3-4 years though, especially if they only aim for 60 fps.
Coffeelake could be an excellent buy for people on broadwell and haswell CPUs, especially if they are on i5s.
But we really need to wait for benchmarks/reviews first!
We really need AMD to step it up and drive Nvidia to bring out better products and prices. Vega seems like a dud and that's just going to keep Nvidia releasing minor upgrades but with higher prices.
Of course. Even prices for no mining cards (like the 1080/1080Ti) are through the roof currently. An Asus 1080 strix costs nearly 700€ currently and I bought mine for just 560€ 6 months ago. The price increases for RAM and GPUs make PCs way too expansive.
My PC sometimes does not recognize USB devices and having devices plugged in the two front ports at the same time straight up doesn't work.
Additionally, my PC sometimes needs several attempts to boot up. The screen will just stay black.
Also, I have two different unconnected Samsung Evo SSDs (256 and 512 GB variants) since when I have them plugged in my PC keeps freezing.
All of this has been a thing for over a year now but now I finally care to do something about it.
Since all of these issues appear to be related to a lack of power, I'm guessing the culprit is either the mainboard or the PSU?
Freezing sounds more like a MB or even driver issue tbh. I'd try to check if there is a new/updated bios version for your MB and than reinstall windows (fresh) after updating your bios (just to exclude a software issue).
But it could very well be PSU related, or even both...