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Sorry to hear but yeah, its a very widespread issue. So widespread in fact, that several game developers have the Intel XTU "fix" stated on technical support FAQs. Crazy situation to be in.
There are several topics on that issue, like here:
https://linustechtips.com/topic/1504852-intel-12th-gen-processor-and-motherboard-bending-problem/
Nothing to do with ECores.
You may want to reconsider that cocky attitude. All three of my prior 13900ks also worked flawless. For a few months of heavy DX12/shader cache gaming. Then they all started to fail in identical ways and all reports show the 14900k is already in the same situation.
Yep, I thought the same originally but CPU bending affects just the surface area. That could mean some PCores are being hit harder than others but all the investigation I've performed suggests CPU bending wouldn't result in Core errors, just means some cores may run slightly hotter than others.
I wouldn't discount it completely of course, it's another possible reason. This is part of the issue, nobody has been able to lock it down. The consistent factors are Intel 12th-14th Gen CPUs + 690/790 motherboards.
And all I'm saying is, its not an out of the box problem its a degradation. So keep an eye on it over the next month or two, depending on how much you game and get ready for the RMA. It's very likely to happen.
I've had my CPU for quite a while and nothing happened, but to be fair I locked it at 125W TDP, since I expected some issues in the long run and the thermals unthrottled had me worried on day 1.
But ofc it's not a viable option for everyone to limit the CPU to 125W, even though there are no major disadvantages in gaming.
I faced that issue as I undervolted my 13900K by -0.090mV and using PL1/PL2 253. After checking the WHEA logs I found the parity errors only for the period I had the above undervolt setting. I tested my CPU settings with Cinebench r23 and Prime95 and neither of them generated WHEA Errors.
After some BSODs I decided to tune up my undervolt configuration and reduced it to -0.075mV and PL1 200W and PL2 253W (I needed the PL1 change as it's summer in my location and my room gets hot around 33C and that delta temperature doesn't allow my AIO to keep the CPU temperature under 90C). I ran Cinebench r23 and Prime95 again with no WHEA errors and this time I also added the 7-zip benchmark as that should be a similar compression/decompression workload for the CPU as the shader compilation done by some games and after monitoring HWInfo, no WHEA errors were registered.
Since that last adjustment, I have had no crashes neither instability issues with other applications. I have been testing latest games to test the CPU and no WHEA error/warning logs have been registered.
I have my 13900K for a year now and the WHEA error/warning logs I have are only for the period I apply the -0.090mV undervolt.
Here it is my current PC configuration: https://valid.x86.fr/lygtu5
One question for OP: Of all your KS processors that you had with this issue, were you applying any kind of OC? Even if you have been using the CPUs at stock, all Mobo manufacturers have stupidly higher voltages for the z790 chipsets out of the box and running your CPU at stock values with voltages higher than 1.4V degrades the CPUs in the long term. If you applied OC have an eye on the CPU voltage as Ideally you should have running below 1.35V.
Is this just an issue with the K series of the 13th and 14th gen? Or will it "likely" happen to all the 13 series and 14th series processors? For the record this same degredation happened to my 13900k in december and I upgraded to 14900k which seemed to fix it. Now I am getting the optimize shader error on this game unless i set the SVID on my mobo to Intel Fails Safe.
Can't say, all my energy went into the K situation but there its uniform across the 700 and 900s.