Stability issues with Formula Z790 / i14900KS when all e-cores disabled

[SirDystic]

Even on the latest BIOS from yesterday this is still buggy / unstable as hell if you disable all the e-cores in the BIOS. You have to set Intel Fail Safe SVID to even run Windows. Just disabling multicore enhancements doesn't work in this case. (Formula Z790 / 14900KS).

[Will3131]

Hello, 

What kind of power supply do you have. I have a Evga G6, 1000w. I had instability issues when I first installed a 13900k, everything was crashing within seconds of loading any game. I isolated everything and determined that it was an issue with the power supply OCCT would fail on the power supply test. Come to find out it was the power itself it was the fact that I had both 8pin cables coming from the same rail to the RX 6950xt. I took one cable and used the other PICE rail. After that the PC never crashed again. So, it seemed at least for me with the wattage that the 13900k was drawing and the RX6950xt it would cause a crash even with 1000 watts. Ensuring I used both 12v rails on my power supply did the trick. 

[SirDystic]

I have a Rog Thor 2 850W running at about 350W load at the time. I will check the cabling, but as I said it works fine with the above Intel settings. And it works fine with multicore enhanced settings enabled with the e-cores on! This seems to be a specific stability bug related to disabling the e-cores.

[Will3131]

Ok, got it. This may work for someone else that is having stability issues, it's the weirdest issue. That took me over a month to figure out. It had the RX 6950xt plugged into VGA 4 and 5, then I moved one to VGA 2 and VGA 5. And everything was stable after that. I found that running about 7 minutes of OCCT on each item CPU, VGA, Memory, and then Power supply will tell you which part is actually not stable.   

[Will3131]

Also ensure you have both 8 pin cables to the MB installed. I know that it's not necessarily needed but It helped in keeping my system stable. I'm running an ROG Z790-E gaming WIFI, 13900k, XFX RX 6950XT... 

These are just suggestions to try, they helped me troubleshoot a while back. OCCT was fine on the CPU, GPU, Memory, but would fail or completely crash the system as soon as I ran the PSU test. 

[SirDystic]

Yes I have the motherboard fully cabled. As I said above it runs fine with the e-cores enabled.

[SirDystic]

Have to hope this is fixed in a future BIOS update.