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If i plug in my GFX into another Slot then PCIEX16(G5)_1, there is no more WHEA 17. If i turn PCIEX16(G5)_1 to Gen 3, no more WHEA 17 aswell. There is definitely a connection with the PCIEX16 (G5) _1...

I PMed you the Details.

Turning off APSM for PCH PCIE Express makes the PCH Temp about 10°C highers for me. Thats not a good work around.

@STARRAIN

To shorten this up. It has nothing to do with CPU, RAM, PSU or...

i have had the same issue. After i set PCH PCIE Express ASPM to disabled they disappeared for the most part.
12900k, Z690 APEX, WIN10.