Unknown Problem with CPU Causing Overheating

Sep 13, 2018
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First, I would like to apologize, I'm very green when it comes to computers and very recently this year, I had built a custom computer with my friend. I understand the very basics but I'll do my best to explain.

So my build, I currently have an i5 8600k intel core processor, a NVIDIA Geforce GTX 1060, and a 52x kraken liquid cooler. After assembling the whole thing together, I was able to run everything smoothly and the whole thing seems to be fine with one exception: the CPU temperature tended to be really high. When gaming, for example, Overwatch, my CPU would go up to 80-90 degrees C and sometimes up to 95 but it caps off at that point. After a while, I started to worry about the long term damage this was doing to my CPU so I figured there must have been a problem when we first installed the heatsink. So, I took off the case and reseated the heatsink, applying a new coat of thermal pasting and booted up my systems again. Now, it got worst. My temperature when gaming now goes up to 88-95 and I quickly close out the game as to not damage my CPU any further. My frame rates have dropped drastically, with it once being able to go at 60 FPS on ultra graphics, now limps at a solid 2 FPS and the graphics looks incredibly blurry. I checked my graphics card and it was a solid 37 degrees C so no problem there. So there is something wrong with the CPU and heatsink, at least that's what I assume. So what do you think? Does this high temperature cause my games to drop my FPS into the single digit? Is my heatsink broken and needs replacing? (It would be weird since I've just bought the thing this summer) Please, any help or advice would be appreciated.

Edit: Thank you for the answers given so far, I'll try to check and see if the fan isn't being connected properly. If it still fails, then I'll go replace it and see if that works.
 
I thinkthe kraken liquid cooler is not doing its job. You have the standard heatsink, try using it. If the temperature get better with standard heatsink, then you can refund the liquid cooler.
I never use liquid cooler as it too hassle and its not worth it for me. The most expensive heatsink I ever bought was the $40 Intel BXSTS200C for lga2011-3 (cheaper heatsink for lga2011-3 was suddenly gone at the time) and it was able to keep my Xeon E5-2xxxL V4 under 57 celcius on 30% fan speed (limit of noiseless speed).
 


I apologize for my lack of knowledge, but when you mention standard heatsink, do you mean something like a noctua heatsink? Or is it something I should already have?
 
Agreed. If the cooler fans are running and set up to be blowing out of your case, it's likely a bad pump. With that cooler your temps shouldn't have ever been that high. I'm assuming you aren't over clocking it right now.