I am experiencing machine stutters on my PC, after changing every single component 3+ times (every component, yes) and reinstalled operating system over multiple different disks. Yet, they still persist with a sufficient power supply. All drivers reinstalled.

These stutters usually present themselves during processing, i.e. playing a game, or watching YouTube in a web browser for example.

So is it possible—in a situation like this—that AC mains (UK ~230V 50hz) can cause micro stutters under load in modern PC's with potentially noisy mains in a home?

See https://youtu.be/PY5QyRKK0IM

closed as too broad by DavidPostill Nov 9 '18 at 20:57

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    What possible line of reasoning brought you to that conclusion? – Tetsujin Nov 9 '18 at 14:05
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    @Tetsujin So, I would never have assumed this. I have tried every possible diagnostic step to get to where I am now. If you would like to message me personally, I can provide detailed posts of what I have performed thus far. The only consistent 'model' of component is a Ryzen 5 1600, and other users aren't reporting this behaviour. It's my third Ryzen 5 1600. My third PSU, 5th motherboard, 5th monitor, 4th GPU, 3rd set of RAM, and 4th SSD. It is at the point now where I have followed the required steps to perfection (to usually solve these issue) -- now I am here and told to check AC. – mpw Nov 9 '18 at 14:50
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    @Tetsujin this is over multiple operating systems, stock settings, overclocked, and underclocked, fresh installs, every driver for AMD and Nvidia GPU's over the past 2 years, and every BIOS released for each board. SSD firmwares, etc. All software components can surely be ruled out. – mpw Nov 9 '18 at 14:52
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    @Tetsujin I appear to have posed my question incorrectly. What I suppose I mean would be - Could potentially noisy mains cause such an issue? – mpw Nov 9 '18 at 15:13
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    Exactly what do you mean by "stutter"? – Michael Hampton Nov 9 '18 at 18:09

Short answer: no

Long answer: The PSU converts the 50/60Hz AC into a near-perfect DC, with the remaining ripple being well above (orders of magnitude above) a few Hz. You could of course use an 48VDC PSU and 4 car batteries, but I am convinced, you'd see the same stuttering.

It is much more likely, that the stuttering is part of an interaction between software components, most likely some drivers, or just the hardware not being able to perform the tasks fluently.

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    Thank you for your reply. I don't know if I am allowed to discuss this here as per the rules of the website, but I would like to know how this could be possible over: 2 different brands of motherboard (therefore with 2 different BIOS programmers) in which case one model was replaced 4 times. 2 different graphics cards, in which case one model of them was replaced 3 times and 4 different disks. 2 x SSD and 2 x HDD. Windows 10 and Linux Mint. Of course, fresh installs, all drivers removed and added, etc. It seems to be purely down to the mains, but I cannot be sure based on this answer. – mpw Nov 9 '18 at 14:45
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    I appear to have posed my question incorrectly. What I suppose I mean would be - Could potentially noisy mains cause such an issue? – mpw Nov 9 '18 at 15:14
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    I am convinced, that a very low-quality mains feed could make a computer crash (if the ability of the PSU to smooth things out is overwhelmed), but not stutter and recover – Eugen Rieck Nov 9 '18 at 15:59
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    There's a simple way to test, take your machine else where - a friends house for example, and see if the problem exists. I'm pretty confident it will. Also, did you change the MONITOR ?? – djsmiley2k Nov 9 '18 at 16:01
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    @djsmiley2k Not a possibility, I'm afraid. However, yes, I have changed monitor 5 times, with 8 different cables. – mpw Nov 9 '18 at 16:08


If your supply was that bad, you'd see either memory errors at least, or hard lockups at worst. You wouldn't get a constant, reproducible error such as 'stuttering' during computation.

You don't mention if you've ever changed the monitor and depending on the monitor and it's sync settings, you maybe seeing screen tearing caused by vsync issues.

To rule out the fact it's the supply, simply take the machine to a friends house and power it on there.

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    Sadly not an option to move the machine. Yes, I have tried 5 monitors, and 8 cables. It's not screen tearing. VSync on and off causes it, but VSync on causes too much input lag. Besides, it's a 144hz monitor. If I sync the frame rate manually, more or less, it still persists. If I use VSync, it persists. If I unlock the full frame rate, it persists. – mpw Nov 9 '18 at 16:10

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