Is there a laptop with an i9 10900k and an RTX 3090?
Yes, but these laptops with a K CPU are as thick as suitcases because the cooling has to handle it. Who wants to do that to themselves?
Yes there's.
MSI GE66, for example.
Yes there's but I would not get such a part, they are very prone to overheating etc or plastic edge melt etc, so I would not play a little game with such a part for 10 hours at a time, I think these things are just not yet Well-engineered, and moreover, a part of this easily costs 3k euro, for that money you can build an absolute high-end PC!
A 250W CPU with a 350W GPU in a notebook? I don't know who wants that?
So I think nobody builds that.
Am I wrong or does MSI not offer an RTX 3090 at all? The RTX 3080 seems to be the most powerful graphics card for gaming laptops.
https://de.msi.com/Laptops
Yes and? You can build a power supply
That is correct.
There's only a maximum of one RTX 3080 Max-P for the laptop.
And a suitable cooling. So a case with a monitor integrated.