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Entire PC stuttering, need help to identify problem.

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Trying to determine if a specific piece of hardware has been causing my issues.
PC specs:

Z97MX- Gaming 5 motherboard with
Intel Core i7-4790K (motherboard is about 5-6 years old)
Geforce GTX 1070 Ti (card is relatively new, a little over a year)

C: drive is Samsung SSD 850 120GB
(came with pc, 5-6 years old)

D: drive Samsung SSD 860 1TB
(had for about 4ish months)

PSU is someting like a 850W

So since I got the PC back 5-6 years ago, one recurring issue has been on powering it on, sometimes the PC will just sit powered on but not display anything and doesnt respond to any input devices/commands. I don't believe its the graphics card as it has been recurring even when I upgraded from my old card. This isnt my main issue though, as restarting the PC usually solves it and everything works as normal. However with my recent problems this issue has also gotten worse. I find myself having to restart many, many times before it will finally load to the login screen.

My main recent issue (about 3-4 weeks now) is everything stuttering/functioning like its going at 10fps. Its not limited to any application, it's the whole PC. Loading in after initial login, the screen stutters as it loads icons. Web browsers take a while to open and load pages (sometimes freezes up for a period of 10 seconds or so). Sites like Netflix and Youtube have trouble loading videos, stutter trying to buffer the videos. Other applications like windows explorer, steam also stutter or momentarily freeze up when loading or going through file paths. Games that used to easily run 60fps now run anywhere between 10-40 fps (usually closer to the former). Tested on multiple games.
I've tried using some basic hardware diagnostic tools, but they don't detect any issues. Used Samsung magician for the 2 drives, it says their temp is normal and health is good.

GPU is sitting at around 40 C and CPU around 90 C, CPU being way hotter than it should be considering i'm not running anything and this is shortly after booting up. CPU has closed water cooling.

As someone who isn't particularly tech savvy, i'm at my wits end trying to figure out the issue here and if I should be replacing one specific part or multiple. Any help would be appreciated, I can provide more information if needed.
 
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