That linked post is just part of ongoing investigation. This is unfortunately how it works. Until you find source, block it, you can go in circles trying to find out what is wrong if you don't catch what is really happening.
I just wanted to know about measurements, but whatever. Let's go with it for 100th time:
Symptoms:
- Inconsitency in inputs. Doesn't matter what hardware, new, old, Intel, AMD, laptop or PC, Windows, Linux, all the same.
- Overall system feels weird, not snappy, game physics behaving weird
- All symptoms scaling with power usage
- Monitor smoothness is not as it should be
- Some people with similiar issues have above plus:
- Worse image quality
- Measurements:
- All possible measurements with software failed to find any data to correlate with issue happening
- Easy to tell by experienced players in blind test - easily noticeable when you had it working correctly. Having someone with experience come and play can easily notice something is off.
- Issue is not present at other locations with same hardware
How issue behaves in timeline:
- Sometimes it works better during night, sometimes it is bad for days.
- Disconnecting, conencting devices, especially filters makes some temporary difference that can last up to days/weeks
What was already tried:
- Multiple EMI/RFI filters / Schaffner FN700Z
- Double conversion / Online UPS
- Capacitors used for power factor correction
- Ferrites on power cables between socket and PSU (helped to some degree - for multiple people with same issue)
- Balanced toroidal transformer - So far helped for me. For some reason working only with floating ground - so no direct connection
Used this device to isolate suspected device and that is why I suspect this specific device - because it also worked same way as isolating PC, while without isolating issue comes back - unless suspected device is disconnected.
Measured harmonics - all in norm.
Measured RFI by myself with RFI spectrum analyzer, also asked professionals to measure - nothing.
Now, knowing potential source, I would like to know more why it happens. Maybe it is some kind of interference, but not easy to catch, maybe it's ESD, idk.
I have tried to power using UPS battery disconnected from grid - it was better, but battery lasted short time. Comparing that to some period of time when it would be better by itself, it is not conclusive, but maybe indicative that it is conducted.
We have discussed on motherboard elements like oscillators being affected, which would affect timing of everything in system, resulting in this inconsistency in whole system. There are some studies showing oscillators being affected by ESD. How strong it would have to be to affect it to symptoms like above to appear is the question.
I also suspected supraharmonics, but this is something completely new and barely anyone heard about it.
I doubt anyone will deduct anything more than I already heard or read. So I am just trying to find ways to measure things to know more.