Yes, mine has that too, but I only hear it when it's quiet in my room and I have my ear close to the case. So I don't hear anything when I'm gaming. And it only occurs when I use it heavily. So it's not annoying and if you use a headset you never hear it.

Hello

Can't tell you that yet Pc is still being built, can only pick it up tomorrow

This is the case with practically all new GPUs. At high fps or 4k120+fps, practically under full load, you can sometimes hear it. But it's not really annoying if you play with a headset.

Yes, as far as I know, all RTX4090s have it. Mine has it too. But it's only clearly noticeable during a benchmark. I haven't noticed it negatively during gaming so far. My PC is on the table, right next to the monitor.