Question PC intermittently suddenly runs slow for about a 1minute, then freezes

TraineeIdiot

Commendable
Apr 7, 2020
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Specs:
CPU: 3800x (rog ryujin i 360)
MOBO: Crosshair VIII Hero
PSU: RM750 (Corsair)
RAM/Memory: 4x 16GB G-SKILL Trident Z Neo 3600Mhz (F4-3600C16D-32GTZNC)
Storage: Samsung 980 PRO 1 TB, ADATA XPG SX8200 Pro, 2x Western Digital Caviar Blue 1TB
GPU: 3070TI R
Case: NZXT H710i
Fans: 1x Noctua NF-A14 iPPC-3000 PWM, Heavy Duty Cooling Fan, 4-Pin, 3000 RPM (140mm, Black)
6x Noctua NF-F12 iPPC 3000 PWM, Heavy Duty Cooling Fan, 4-Pin, 3000 RPM (120mm, Black)

The PC will start to randomly react super slowly, and then become resistant to some tasks, but not others. For example, I can switch tabs in chrome but cannot minimize chrome or maximize other programs. I can also use most windows functions absolutely fine. This continues for about a minute, maybe less and then the PC just freezes. The mouse is still operational, everything is just unresponsive. The only way to resolve the issue is to hard reset the PC (hold down the power button), simply pressing the power button does nothing. The issue has recently occurred, soon after getting the current GPU and had considered the PSU being insufficient. I used a site (https://outervision.com/power-supply-calculator) that calculated required PSU for a RIG and apparently, this PSU was sufficient (about 100watts over). Although, I would not be surprised if the peripherals I could not specify, my steering wheel and pedals mostly, were pushing it over.

Note:

This appears to happen indiscriminate of what I am doing. It has occurred whilst just using 2 chrome tabs and also whilst gaming. On occassion this has happened 3 consecutive days in a row (only once per day) and other times not occurred for over a week.

When I have experienced the PC beginning to run slowly, I have opened task manager, HWmonitor and resource monitor to see if there was anything particularly odd. Temps look fine, although I will grab a screen shot the next time this occurs. Resources don't seem to be under any particular stress (no more than usual) BUT. my CPU within resource monitor goes to 0% and there is only one process running I believe (can't remember which if any).

This had lead me to believe that the CPU was at fault as I had had some thermal issues with this in the past.

Also, now, when I turn on the PC it turns on as normal, 1 second later shuts down, the starts back up as normal.

Thank you for any good advise in advance.


------------UPDATE---------------
A couple of hours after making the above post, the issue occurred again, although, this time, it did not eventually freeze.
Resource monitor was showing 13% an wouldn't go any higher. Believe my clock speeds were about .5GHz.
Checked HWmonitor and saw that my CPU temps had spiked to 77C. High for what I was doing but not high enough to cause this issue, well, that's my understanding anyway.
Checked power options to ensure the minimum speeds were set too low and they were at 100%.

I imagine I have 4 options at this point.
Faulty CPU.
Insufficient cooling:
Fans - Doubt it but will check.
Poor contact - Possible, was careful not to wind the AIO on.
Some config somewhere that is adding a limit to the clock speeds.
 
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