I had a 13900K blue screen at random for almost a year. Anything that used more than a certain amount of cores would either crash or blue screen, which was irritating considering I built the machine in part so I could do simulations and renders in Blender. I was also unable to use dual channel RAM. It just wouldn't POST no matter what settings I used.<p>I went through 3 motherboards hoping it was that, and not the insanely expensive CPU that would be a pain to RMA. But as it turns out, the RMA process was very quick and painless once I provided my troubleshooting history. But due to it being my main computer that I make my money with, I had to buy another processor to fill the 2 week gap between sending the old one and receiving the new one.<p>I probably spend $1500 or more on this problem, and by the sounds of it, my troubles might not be over.