This was mentioned in another comment already, yet I’m explicitly looking for a “non-invasive” solution.

I know, that’s why I don’t even bother with looking for a more beefy card.

It has, and I use this setup for years already. Thought about tinkering a bit, y’know? :-)

Thank you very much!

Thank you for the recommendation, but I would prefer not to tamper with the board.

It requires an x16 slot though