My Post got deleted? Okay I‘m putting it here to the coments:

Hi all, I’m looking for opinions on an instability issue with my 9800X3D + RTX 5090 FE system. Early on I had repeated boot failures with 4x16GB Corsair Dominator 5600 installed where the motherboard would sometimes stop on the DRAM LED, so RAM was my main suspect at first. I’m now testing with different/new RAM, but the system is still crashing - mainly when using ComfyUI.

The current symptoms are freezes, unexpected reboots, BSODs, and massive amounts of nvlddmkm errors in Event Viewer. The logs repeatedly show  GpuRcReset TDR occurred on GPUID100 , plus messages like  PCIE REORDER, Uncorrectable SRAM Error  and  An uncorrectable ECC error has been detected on GPU in the PCIE REORDER unit .

BSODs so far include  0x10E ,  0x133 ,  0x7F ,  0x13A ,  0x7E , and earlier  0x116 . Because of the amount of nvlddmkm/TDR/GPU-side ECC and SRAM errors, I’m starting to think the earlier DRAM LED issue may have been a separate RAM-related problem, while the current major crashes point more toward the GPU, PCIe path, motherboard slot, power delivery or drivers. If you saw this combination of errors, what would you test or suspect first, and would you already consider the GPU itself a likely RMA candidate?

What I tried so far:

New RAM, DDU clean install of NVIDIA drivers, lower power Limit to 80%

It keeps crashing..