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That sounds like the same problem I have. I've sent my laptop in twice for this high pitch whine which is quite audible when fans are on full due to cpu / memory usage. Most recently the motherboard was replaced and was returned to me with problem intact. I'd be happy to find a solution to this as well.

Have the same problem with the new bios. 

Click here and update the bios.  You can also click here and here for troubleshooting resolving fan issues.

* Fan noise on Inspiron/XPS Notebook/Vostro Notebook/Mobile Precision/Latitude systems

* XPS Notebooks: Loud fans & high CPU usage with the Killer Control Center driver installed

* Connect the external power adapter to the left side primary Thunderbolt 3 (USB Type-C) port with Power Delivery
- Does the online Quick Test pass?
- Create and post a video when running the Custom Component Test- Performance- System Stress test

Okay so lets start the timeline

I ordered XPS 13 9305 i7 on 9th of August, after a week I didn't got any update, I called them and the customer service team told me that your order has not been processed due to security reasons (please note the payment went through on the same date of purchase). Firstly, if that was the case Dell should have informed me earlier but rather my order was sitting there a whole week.

After 2 days days, I got a message that the shipment is delayed due to parts shortage I was like okay it happens due to the Covid situation but when I see the same model on Dell website, it said the fast shipping available lol.

I called customer service again and the agent name was , when I explained him the whole situation that in your website says fast shipping available and I just got an email that shipment delayed due to the parts missing, he tried to convince me that it is a different model (though the model and price was exactly same). Then I need to cancel that order and order that same model again and it was shipped in 3 days (funny right)

Now coming back to the topic:

I open the laptop and soon after 15 second i got the same fan noise, after chatting to the technical team for almost more than an hour they were unable to fix the problem and said that you might need to return the product (So Frustrating) which will take around 14 business days more. Can you imagine how big joke it is to deal with Dell. I never had these issues with Samsung, Apple and Windows.

I HIGHLY DON'T RECOMMEND THIS BRAND

I had the same issue in 2021 when I got my fan replaced. It worked for a while... then i started getting noise again. This time, i opened up everything.including not just the fan but the internal assembly of the fan itself and I greased its brushless motors using the everygreen WD40... It reduced the noise a bit for one of the fans ....but then soon after, things were back...