You are right.
But is it worth compromising your goodwill over a ₹9k card? The buyer is clearly dissatisfied and didn’t anticipate the coil whine being this noticeable.
Even if you take the card back, you are not really losing anything.
List it for sale again and disclose the coil whine (with an audio clip). Then gradually lower the price until it sells. Easy peasy.
Thanks for responding, I appreciate it @Navier
I want to make this clear that GPU definitely works, but the noise under load is severe and wasn’t disclosed at the time of sale. 
Based on helpful suggestions from members here (which I’m grateful for), undervolting does reduce the coil whine, but at the cost of roughly 15–20% performance loss, which affects the card’s value and usability for me.
I raised this within the testing period and that coil whine mitigation it requires a significant performance compromise.
At this point, I see two fair options
I’m open to resolving this peacefully with either option.
@ducktape please upload video which was shown as working proof by @Navier . It will make things clearer.
@rainbowfluorite here’s the link of the video i was shared by OP- https://drive.google.com/file/d/1o2rBBjxUnaYBny56OLi5F5v-ZJKlx_K-/view
Just for reference, and here’s the video recording of my experience, as reference
(Honestly as soon as you asked that i did put on headphones, and watched both videos back to back to check if the “khrrr” sound was present in case.) I don’t feel that it was, but i’m open to community feedback.
Edit - added the msg with the link
In case you can’t return the fan and the noise bother you too much.
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I had a similar fan noise with one of my GPU fans. Most of the GPU Fans have a sleeve/rifle bearing with an opening in the back covered with a sticker. You can put HALF a drop of sewing machine oil and seal it with the same sticker or masking tape (will absorb any excess machine oil). It was magical (at least for me) no bearing noise anymore, it was so good that I can now clearly hear the coil whine (which you can’t do anything about btw).
I understand the noise is frustrating, though the card itself is functionally perfect. As a private seller I don’t offer a return/refund policy, but because I value this community, I can refund 500 INR as a goodwill gesture so you can keep the card at a final price of 8k. This is my final offer to resolve the matter.
I truly appreciate the willingness to resolve this, and I thank you for the offer.
To be honest, ₹500 doesn’t reflect the actual impact here. I’ve discussed the performance loss when reducing the sound, which affects the card’s value by about ~15%. For example, if I were to resell it, I’d most likely have to mention this in the post and share a video with specifics, and only a knowledgeable buyer would probably proceed. Hypothetically, of course — I do need this GPU at the moment.
But I’m willing to accept this on one condition, in the spirit of the community: that future buyers are given clearer and more elaborate upfront information about your merchandise’s characteristics and quirks, especially when they are this noticeable. I feel this is fair to you as well, instead of me attempting to modify your seller rating. I’m not trying to be petty, i swear.
Kindly let me know if we can conclude this without escalating further.
I read the whole thread and I cannot come to a complete conclusion that either of the party was in the wrong here (for whatever my words are worth lol). That being said its nice to see both of you are trying to solve this issue. My respect.
The ₹500 has already been sent as a goodwill gesture to conclude this matter. Coil whine is not a defect but a known characteristic of many GPUs, and the card was demonstrated as fully functional in the video before the face‑to‑face sale. It is not possible for a seller to anticipate individual sensitivity to such aspects, and buyers are expected to research these quirks beforehand.
I have acted transparently and fairly, and this resolution reflects that. The issue is considered closed. Thank you.
I can confirm the amount has been received.
That said, I do want to put on record that my concern wasn’t about whether coil whine is “normal” in general, but about disclosure. When I raised the issue, the response focused on it being normal rather than clearly acknowledging that the card does exhibit audible coil whine under load.
I feel that clearer upfront communication could have avoided the back-and-forth and testing on my side (again, thanks to community members for helping me out). That’s all I wanted to highlight.
Coil Whine is an unavoidable phenomenon on a Graphics Card.
What might sound abnormal for you, might be normal for others (especially for the seller 
).
If Coil Whine is NOT a criterion for rejection or indication/proof of a defective product, neither the seller nor the TE forum can be held accountable.
Cooling fans in MANY Laptops and Mini PCs make a LOT of noise when the computers are under load. That sound could be considered troublesome/bothersome also. The fan noise should go down significantly under routine operation/PC is idle. If not, and if the fans are sounding broken/damaged, only then can the seller can be held accountable.
If I am wrong, please correct.
Just my experience, i have bought GPUs, PSUs and Fans and sold them too. I have always been made aware of coil whine…and in each case it was so low, I didn’t even notice it.
It’s more of an expectation thing, you notice it more when you expect it to be perfect. The seller and buyer are not wrong here, just a bit naïve. It’s a shared responsibility, for seller as part of rigorous disclosure and for buyer as due diligence.
I make it a habit of recording a video of fan up close at 100% speed and sharing it with the buyer. And if a product I am selling was used for more than a year I just tell them to expect some coil whine even if there is none. If they don’t hear it, they are happy if they do, well they expected it.
Instead of refunding INR 500, seller could have just shipped him a compatible pair of GPU fans and called it a day. That would have been way better, but if buyer has already agreed, I guess it’s fine!.