i7 8700k problems

That's not particularly alarming. Also, STAY AWAY from that Overclocking software; it will lead to nothing but system instability down the line. When was the screenshot taken? Even with that one core being used a bit, your background usage is 13%, which isn't too bad (don't know what background tasks your running.) Do you experience any stuttering in game at all?
 
Jul 21, 2018
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Hello. The screenshot was taken just now. Only windows applications were running in task manager. ( https://fil.email/CusT8wxG ).
About the stuttering... That is actually my problem... Whenever I'm entering any game or anything, i'm having huge fps drops.
 
Jul 21, 2018
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Intel I7-8700K,
GTX 1070 Seahawk ek x,
Water cooling EKWB Slim 360,
Motherboard Asus ROG STRIX Z370 G Gaming Wi fi AC,
Corsair Vengance 16GB DDR4.

I've already reinstalled my windows twice only today. With different versions of it. Same problem.
I've also tried a benchmark. Here's the result: http://www.userbenchmark.com/UserRun/9830558 . After all that, it says at the bottom ' Very high background CPU (75%). High background CPU reduces benchmark accuracy. Find active processes with Windows task manager (CTRL+SHIFT+ESC). '
+ quick little side note: the temperature of the I7 is ~40-50C.
 
Have you applied ANY type of overclock?

All of this would point to a bad OC. I would recommend resetting your settings in AI Suite 3, then uninstalling it along with any other CPU OC'ing software you have. Nothing can beat the good ol' fashioned BIOS/UEFI OC.

Are you getting that temperature when idling, or during the test?
 
Jul 21, 2018
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I've tried to apply OC on my proccessor. I think that's actually the problem. One core has stuck (not sure about this).
If I plug the pc out and wait some time, the core seems to be working. After I open an application/game, it's starting to use all of the core. ONLY ONE. If I only shut down the pc and turn it back on, the processor is still stuttering.
I've also tried to reset the processor with AI Suite 3 and uninstall everything that had to do with OC.
The temperature, when i'm benchmarking the processor, is between 50C to 66C(max.).

p.s.: When i open an application, every core works. The thing is that one core is used 90-100% and it stucks at that percent...