The 4090 costs ~$1800 and doesn't have dual OLED screens, doesn't have a battery, doesn't weigh less than a pound, and doesn't actually do anything unless it is plugged into a larger motherboard, either.
Apple M3: 29685
RTX 4090: 320220
When you line it up like that it's kinda surprising the 4090 is just $1800. They could sell it for $5,000 a pop and it would still be better value than the highest end Apple Silicon.
Adding also M3 MAX: 86072
I wonder the results if the test would be done on Asahi Linux some day. Apple implementation is fairly unoptimized AFAK.
The 4090 is highly specialized and not usable for general purpose computing.
Whether or not it's a better value than Apple Silicon will highly depend on what you intend to do with it. Especially if your goal is to have a device you can put in your backpack.
People have been tiling 24gb+ models on a single (or several) 3090/4090s for a while now.
It's stupid to look at OpenCL when that's not what's used in real use.