Systemwide lagging and CPU stuttering

[yep123]

I've post about this on Toms Hardware forum but no one is responding so I thought I'd post here. I'm just going to copy paste what I exactly said in my original post

 

About a month ago my CPU fan just started ramping up at the smallest tasks and every game I played would run normally with the CPU fan a lot louder than it used to be, but there would be frequent FPS drops and stuttering. The only thing that could have caused this was me changing the priority of Star Wars: Fallen Order in Task Manager, because this lag never happened before I did this. I've ran stress tests over and over for the past month, no CPU, PSU, GPU, disk problems (the only problem was with my external drive dying which I've gotten rid of), no viruses, no corrupted files (I do a sfcscan every few weeks), no cryptominers, no physical damage, no dust (I've cleaned my computer multiple times), switched my memory from 1 3 to 2 4 slots. Simple programs like Discord that never lagged before are now freezing up when I try to scroll up in a chat, opening Chrome makes all audio freeze and the cursor stutter all across the screen. Please help, I don't want to buy new parts. All my temps are normal and there seems to be no thermal throttling of any time. I've reseated the CPU and its cooler with new thermal paste twice already, but no fix. I've narrowed the problem down to software and something to do with power plan/power settings. I reset my power plan to its defaults, and the lag and CPU fan ramping up and down seems to stop for a little bit, but after use it comes back but not as worse as before. Could anyone help me figure out to fix this? The last resort I know of is reinstalling Windows fresh, but I have a lot of personal files and it would be a pain reinstalling everything

[bmx6454]

first, what are your full specs, second, did you run a memory test with memtest86 or something similar? have you tried a clean boot in win10?

 

[yep123]

My specs are
Intel i5-7500

MSI Z270 SLI

EVGA GTX 1070

16 GB 2666 MHz Corsair Vengeance RAM

I've ran stress tests with OCCT and Prime95 and no problems were detected, I've tried a clean boot but once I start opening programs and using the computer more the lag comes back

[bmx6454]

1 hour ago, yep123 said:

My specs are
Intel i5-7500

MSI Z270 SLI

EVGA GTX 1070

16 GB 2666 MHz Corsair Vengeance RAM

I've ran stress tests with OCCT and Prime95 and no problems were detected, I've tried a clean boot but once I start opening programs and using the computer more the lag comes back

what is your psu? what is your storage?  what is your cpu usage when this happens?

[yep123]

My PSU is a 650 watt Corsair gold my storage is a 1 TB Seagate HDD, and a 3 TB external drive I use for backups, there are no problems with them. My CPU usage doesn't spike as it would be expected to with the lag