--snip--
The hashrate shown on your link is for standard RTX 4090 graphic card not those found in a laptop, this 4090 use more power than the mobile counterpart.
A RTX 4090 Mobile use up to 200 watts and a standard RTX 4090 uses 450watts, this shows that their hashing power will never be the same. ..
So if anyone is using RTX4090 found in laptops they should expect lower performance compare to a standard RTX 4090 for desktop computers.
The difference isn't only power usage, but also memory size and frequency according to
https://www.videocardbenchmark.net/compare/4606vs4737/GeForce-RTX-4090-vs-GeForce-RTX-4090-Laptop-GPU.
To mine Bitcoin with an RTX 4090, you would typically use a mining software like NiceHash or MinerGate.
NiceHash these days isn't good choice, due to some controversial change such as more strict KYC requirement and
stealing taking fee when you're inactive. Meanwhile MinerGate have bad reputation, with usually people report lower income/hashrate (compared when using different mining software), withdraw problem or even scam accusation.
Mining one Bitcoin with a GPU would take an impractically long time, as the network difficulty increases over time. It's more common to mine altcoins (like Ethereum) and then convert them to Bitcoin.
ETH switched from PoW to PoS since 2 years ago.
For a beginner, consider joining a mining pool, where you can combine your hash power with others to increase the chances of earning Bitcoin more consistently.
Actually it's what almost Bitcoin miner does.