[fritz]

Such as what as said the line after ? 

You've misinterpreted my message.

I'm referring to the post you were quoted- as per below, namely "some unknown ways". 

they could use some unknown ways.

As we were saying, it's not totally impossible that Nvidia sends hardware info including mac adresses to their servers when you're installing [or using] the official drivers, for example. And if they get a subpoena, they could then track at least the IP linked to that.

^ What you've stated above, Is obviously "known" otherwise you wouldn't have mentioned It.

I dunno what you want to know then ?
This "known way" is my answer to op, which is very unlikely but technically possible. Other ones would be even more unlikely.