When I bought my last sound card (for hifi-headphones) the store recommended me to buy a USB soundcard/DAC since internal cards are subject to electrical interference from everything else in the chassis.
I've googled a lot to verify that claim but get really mixed results when reading.
Has this been debunked or verified in some way? Or is it just a matter of opinion?
I'm not talking about comparing the built-in sound card with an external, but comparing two cards of equal quality. Will the internal card be subject to more interference from the rest of the electronics in the chassis? Or is it so minimal that no one can tell the difference?