Where were you buying your cards that let you return them for coil whine? The retailer I bought from would want to test it, I just know they'll say it's ok and decline a return, so I can't be bothered to go through all the hassle. I should have bought from the biggest retailer in the planet who have a no questions asked returns policy!
I recently bought a 4090 Suprim X, it has the serial number in the same place as yours (so new batch) and I've got a coil whine.
I think it's luck of the draw, and also dependant on load. If someone's gaming at over 200fps they're gonna hear it far more than someone playing a game at 60fps.
One thing I noticed that's far more annoying than coil whine is a resonance/vibration from the shroud at certain rpm. I've noticed a fair few videos appearing on youtube. Here's a video demonstrating the noise.
I've found it goes when pushing the shroud. It also seems to go back a few generations with the suprim X, there were videos of the 30 series suprims suffering with the same issue.
All my retailers agreed the coil whine was poor. Apart from OCUK which I just sent the pny back as "unwanted".
In the UK retailers can't legally deny you refunds for opening the box, no matter what their terms say. You have the right to "define the nature and characteristics of the device" or words to that affect. As long as its like new (you haven't damaged it in any way) you can return within 14 days for any reason. There's the odd exception like opened software etc.
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