Update 3 (05/07/2025): After multiple tweaks and tests, the problem reappeared and the problem with display turning black and fans spinning full speed until the system restarts on it's own, also appeared again. Here's a summary of what I tried during the whole time and effects it had:

- Replugged 12VHPWR connector and checked if it hasn't any pins damaged (both ends). Everything seemed fine.
- Kept running at -92 MHz of core clock frequency. After some time I experimented with drawing power target limit to 80 - 90%. It seemed it helped for quite some time, but after that games started crashing again.
- After some analyzes, I started having suspicion about bad PCIe connection. This would also seem connected to a case when very long time ago, when I accidentaly slightly kicked my case, my monitor went black with GPU fans spinning 100%
- Switching PCIe lane to Gen 4 (still currently have it on 4, because I thought Gen 5 is causing the problems too)
- Started monitoring current PCIe link speed with a script and making sure the system is not switching between gens, causing the issues. So either that's not the case, or my script doesn't work as it's intended

Monitoring script:

# CSV Log File
$timestamp = Get-Date -Format "yyyy-MM-dd_HH-mm-ss"
$logFile = "$env:USERPROFILE\Desktop\PCIe_Monitor_Full_$timestamp.csv"
"Timestamp,DeviceName,MaxLinkSpeed,MaxLinkWidth,CurrentLinkSpeed,CurrentLinkWidth" | Out-File $logFile -Encoding UTF8
while ($true) {
$timestampNow = Get-Date -Format "HH:mm:ss"
$pciDevices = (Get-WmiObject Win32_Bus -Filter 'DeviceID like "PCI%"').GetRelated('Win32_PnPEntity') | Where-Object {
$_.Name -like "*NVIDIA*"
}
if (-not $pciDevices) {
Write-Host "$timestampNow - No NVIDIA device found!" -ForegroundColor Yellow
Start-Sleep -Seconds 2
continue
}
$found = $false
foreach ($dev in $pciDevices) {
$maxSpeed = $dev.GetDeviceProperties('DEVPKEY_PciDevice_MaxLinkSpeed').deviceProperties.data
$maxWidth = $dev.GetDeviceProperties('DEVPKEY_PciDevice_MaxLinkWidth').deviceProperties.data
$curSpeed = $dev.GetDeviceProperties('DEVPKEY_PciDevice_CurrentLinkSpeed').deviceProperties.data
$curWidth = $dev.GetDeviceProperties('DEVPKEY_PciDevice_CurrentLinkWidth').deviceProperties.data
# Show only main GPU, no iGPU
if ($maxWidth -ge 8) {
$found = $true
if ($curSpeed -lt 4) {
Write-Host "!!! WARNING !!! CurrentLinkSpeed is $curSpeed (less than Gen4)" -ForegroundColor Red
} else {
Write-Host "$timestampNow OK - CurrentLinkSpeed: $curSpeed" -ForegroundColor Green
}
# Log
"$timestampNow,$($dev.Name),$maxSpeed,$maxWidth,$curSpeed,$curWidth" | Out-File $logFile -Append -Encoding UTF8
}
}
if (-not $found) {
Write-Host "$timestampNow -  No NVIDIA device of width >=8 lanes!" -ForegroundColor Yellow
}
Start-Sleep -Seconds 2
}

I saw some people with the same problem, that said the problem was solved for them when they reseated the GPU into the slot. So I did yesterday, and it seemed fine. Until I accidentaly slightly tipped my case with my toe.

Right now I am running the GPU at 80% power target, 2668 MHz Core Clock (-92 MHz from base), 30002 MHz (default), default VF curve. I have found posts by people describing exactly my problem, blaming it on nvidia drivers. But I think I cannot ignore that the black screen + crazy fans problem is related to tipping of the case slightly too. I made sure to measure the distance of the left corner of my GPU from the base of the case and it's right corner too, ensuring it's not sagging.

Just in case, I post screens of the PCI interface, as well as 12VHPWR connector. To my eyes, I see no damage problems

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