Makes sense, the Intel chips are far more power hungry than the AMD, so I can see a rather efficient 5800X3D getting by, whilst a more power hungry 9700K would push it over the limit. 9700K can use around 120-150W from memory, whilst the 5800X3D typically uses 85W or less.
My 10700K could consumer over 200W, so I don't doubt the 9700K was similar, given how similar the 9700K, 9900K and 10700K were, whereas the 5800X3D sips power by comparison, and that difference could easily trip a PSU, especially as the Superflowers are overbuilt typically, whilst the Gigabytes not so much!