A lot of people maintain that its not the PSU as they either dont swap it out and insist it was quiet on the previous card, or they test it using one other new PSU. It isnt quite so simple as that due to the rail configuration, quality of components etc.
Some cards do coil whine. I have seen quite a number be resolved once a decent PSU or one that is another brand gets tested in the rig.
I understand. That's why I specifically asked the local store if it was possible to return/swap if it wasn't ok after testing. They said it's totally fine so I went with it. But yeah, my old PSU with my old card was also dead silent, it's a matter of chance. Also I only decided to try this out after finding out that it was both my GPU and PSU that were coil whining... the same PSU that was completely silent for a year running a 1060.