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Troubleshooting system-wide stuttering/jittering?

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Hi

I'm trying to troubleshoot an ongoing issue with my PC that we have hooked up to our living room TV. We only use it for streaming video online.

Basically what happens, and it's very intermittent, is that the system seems like the RAM is freezing up or something, and it will get such intense jittering/stuttering, that using the computer becomes impossible. Videos will do this, and if we close the browser, the cursor does it, everything does it. Sometimes it goes away after a few minutes, other times the only way we can fix it is by restarting. Sometimes it will do it 3 times in an hour (3 restarts), and others it'll go for days without it happening.

I've tried 2 things:

1) Fresh install of Windows - nothing.
2) New 16gb of RAM - nothing.

I really was absolutely positive one of those 2 things would have fixed it, and now I'm stumped.

I have a video - it's hard to see almost. If you look at his hands you can really see it. Audio doesn't seem affected. The mouse cursor also really gets going like we have that old mouse-cursor drag setting going on, which we don't. The whole thing becomes a jittering/stuttering (I can't put a word on it) unusable mess.


Specs:

UserBenchmarks: Game 16%, Desk 81%, Work 15%
CPU: Intel Core i3-10100 - 83.6%
GPU: Nvidia GTX 650 - 8.8%
SSD: Seagate BarraCuda Q1 SSD ZA480CV10001 480GB - 88.1%
HDD: Seagate Barracuda 7200.14 1TB - 94.2%
RAM: Corsair Vengeance LPX DDR4 3200 C16 2x8GB - 82.2%
MBD: Asus PRIME H470M-PLUS
 
since it sometimes does it, and sometimes doesn't, it would be good to pinpoint what makes it happen, that is, repeatable and you can make it happen on demand.

for example, does it happen when not using the TV and using the PC monitor instead?
is there any reasoning behind thinking it only happens with HD video and not SD video?
what cable are you using to connect to the TV - HDMI? if so, what HDMI version is the PC port, TV port and cable?
 
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