We have failed in our neglect to follow BASIC Computer Building standards. No one cares about properly grounding the INSIDE of their PC; The critical issue is that there is nowhere for RF and leak voltage to return to the ground/return of the power supply, without forcing back through the entire motherboard, then up to the 24 pin and 4+4 pin/video card 6+2pin. This could be why your 5000$ RTX 4090 i9 Ryzen 7950 X3D PC cannot beat a potato office PC that someone put a GTX 1060 in per input lag. In this how to tutorial, we will reduce that.
This then ends up in your mouse and keyboard input lines, your GPU data lines, errors in the data busses resulting in resends; resulting in extra desync and input lag where it should have none at all. I propose that this is the reason why changing some random load lines and voltages in bios, can sometimes drastically temporarily change the input lag of a pc, or where changing the ram timings can work for around 2-3 boots before going back to the crappy input lag it had before. It's the worst where the NIC takes this high frequency noise and interprets it as data or errors in packets, creating situations where data ends up sending or arriving out of order or with major client side delays in games like Valorant where the packets are much heavier (and less redundant).
ATX 3.0 and all the standards that came before provides a very strong basis for grounding out components in relations to low voltage CPU operation - for USB, PCIE, and otherwise signalling. Custom PC's completely neglect the importance of electrically conductive screws, and properly ensuring low resistance ground points on all 4-12 points on the motherboard (depending on if you have itx, matx, atx, or even eatx.)
Whereas in the 1990's and 1980's every CPU ran above 1.5V and had gauge thickness wire of 2-3x what we have today for grounding planes, we now have flimsy chinesium sheet metal made en masse, and companies pushing speed over proper computer building know how in the name of accessibility and easy to follow tutorials. IBM used to have a grounding wire of 3mm gauge thickness running to the spacebar of their model M keyboards for the sake of dissipating electric charge.
Ungrounded computer parts, say your GPU or motherboard, can cause it to float above ground, where the negative terminal for DC experiences more noise than it has to by returning on a long path instead of directly to the PSU. It also can create LOCAL ground loops that will kill sound quality of every dac you use. A good power supply can filter this on the return line, but the local ground loops must be broken by good case connection first, or RF and elevated ground voltages will be hard to dissipate
No computer manufacturer outside of the major OEMS like Dell, HP, and otherwise Lenovo, etc, have bothered to adhere to these extremely stringent regulations.
Of course, if your supply has a dirty ground, then the best you can use is an RF-wood absorbing transmitter ground damper or a proper ground isolator IEC plug that has a transformer to block ground loops. Or a USB light for $1 off aliexpress to absorb it. This doesn't solve those. For the madmen who use 2 terminal power prongs to isolate ground (very dangerous), this might help you if you have local ground loops and inadequate return planes on your motherboard for the negative/ground terminal with DC.
Remember, DC current travels best when there is very little resistance, aka along a sufficiently large ground plane with routes that can avoid the majority of signal traces like under PCIE 4, for example. You want it to travel more through the screw mounts than back through whereever the last IC's on the sound card and southbridge are.
If you still have issues like floaty aim, delay, hitreg, etc, invest in a deeper ground rod - this gives greater absorbtion capacity for the ground terminal if you have too many noisy devices running near you or very high EM/radio radiation. The last one looks funny but it radiates RFI into an antenna that sits inside a blackbody radiation absorber.
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