So I got some Thermal Grizzly Kryonaut today and I was excited to see if that paste would lower my temperatures a bit on my Ryzen 9 3900X. I run it in an ITX case Sharkoon QB one, with a Corsair H100X 240mm AIO with 2x Noctua NF-A12x25 PWM fans, a Gigabyte X570 I Aorus Pro WiFi board and a Zotac RTX 2070 Super Twin Fan. But holy crap that paste sucked BIG TIME in my build. I tried 4 times to reapply and test, but the temperatures were much worse than with the thermal paste the corsair H100X and pre applied. The first run with AIDA64 CPU/FPU/Cache stress test results in an 'stop hardware failure' error, something I never got the hundreds of times I ran the test. Second time with reapplying the pc shut off during the test. The 3rd time it ran for 20minutes fine but was hitting 95c on the spikes. 4th time I reseat it again with less paste, but the temperature rose to 90c immediately upon starting the test, so I stopped it. I then decided to pull it all apart again and drop the Kryonaut entirely. Instead I found my trusty Gelid GC-Extreme OC thermal paste, and I then applied that onto the cpu. And now the spikes fell to 88c and the average temperature would be around 79c in the same AIDA64 CPU/FPU/Cache stress test. And the test runs stable and fine. I paid $£15 for that crap tube of 5.5gram Kryonaut. My advice is that for a hot cpu like the Ryzen 9 3900X, then use anything else than Thermal Grizzly Kryonaut.