Is my problem Electrical/EMI?

[xanami]

Hello people, I've been lurking this forum for a while now. I am a fellow competitive gamer from Argentina, got 6000+ hours in CS2 and different other games. Just for context, I consider myself pretty good (Lvl 10 faceit, 21 Gamersclub, etc). I also work in IT.

For the past years, I've been searching for enjoyable and consistent gameplay. I suffer from "Desync", "Floaty Mouse", bad Hit registration, I will stick to the word "Desync". My PC components are: Ryzen 7 7800X3D - RTX 4070 TI SUPER - 32 GB RAM - ASUS B650E-F - M.2 1 TB. PSU MSI A850GF 850W.

I already went through all the tweaks, settings, everything you could imagine, clean reinstalls, bios , etc , etc. I tried everything and everything and i ended up here, in EMI related problems.

I will go straight to the point. My house is not GROUNDED. I don't have grounding in my main panel. Here in Argentina, we have every outlet with 3 pins (phase, neutral and earth) but mine just doesn't go anywhere (there is no green/yellow cable in the outlets).

I experienced pretty strange things, like sometimes, my keyboard would stop working for a couple of seconds, my sound would sometimes just cut off and be back in a couple of minutes. The worst thing that happened was that windows just putted my xhci controller to sleep and i lost sound + keyboard and stuff. Some of this things just doesn't happen anymore or are pretty random (it can happen anytime but that were extreme cases). Anyway like i told you before, i don't have grounding and my house works with a 3-phase system.

This is the interesting part: My dad knows some stuff electricity related bc he works in Telecommunications. He helped me in creating a external ground that goes to a screw that holds my PSU in the case. The thing is that is not a real rod, it's a metal pipe in a pretty good spot(good humidity) and we measured resistance and it was a good ground technically, although the ground cable is >10M (meters) from the pipe to the pc. SPOILER (My problem didn't get any better).

Here is were things start to get tricky. Because my dad is pretty skeptical and saying my problem should not be EMI. He says there is no difference in a real rod and the pipe, no difference in ground cable into pc case and directly into the outlet (where monitor can get ground too) and this type of things.

Here are some measurements with multimeter:

Electrical Environment (Critical Context):

Building: 2-story house, 3-phase installation.

Grounding: NO dedicated earth ground at the outlet.

Workaround: Chassis connected to a metal water pipe (makeshift ground).

Measurements & Data Analysis
1. Electrical Measurements (Multimeter - AC)
Testing for floating voltage/potential differences:

Neutral ↔ Chassis (PC Plugged, PSU OFF): ~150V AC (Floating).

Neutral ↔ Chassis (PC ON, No Pipe Ground): ~100V AC.

Neutral ↔ Chassis (PC ON, With Pipe Ground): ~1V AC.

USB Port Shield ↔ Chassis: ~0.003V AC (Indicates continuity, but common mode noise is suspected).

So to close things up, i want to ask you guys your opinion. Sorry for my English.