You can look at this thread: Thread 

However, aftermarket fan support is limited on these systems and a BIOS update can break the fan support.

What specific Noctua model(s) are you using, so others know to test something different.

It is going to be a trial and error effort, as it has been for previous Aurora models. From past efforts with earlier models we learned that it is not the top speed rpm of the fan that matters, but rather the rate at which the rpm increases as increasing voltage is applied, in order to pass startup diagnostics test.

Some possible models to consider:

bequiet! Silent Wings 4 Pro  . . . (not sure how quiet?)

Phanteks T30 

Arctic Bionix P120 PWM 

It's definitely my last Alienware. I only purchased it because of the supply chain issues and a discount through work. I really didn't think it would be this bad. And the poor quality of non-name components and lack of upgradability... wow. I don't think people in this forum have experienced the joy of building your own PC of high-end parts.

You can change every fan on a R13 and put in a 240mm AIO but here is a tip.

No matter what you change will not make a difference,

Your system will still be slowed down by Dell  power throttling the CPU via the BIOS. Good luck convincing Dell to change that, it is not going to happen. Shoving a 240mm cooling solution in a R13 solves nothing.

Some people find joy in building their own rigs . . . but it is not fun for everybody. Despite what the naysayer has articulated, adding quality, quiet fans and a 240mm cooling solution to an R13 will make it a better performer and provide a more enjoyable user experience. Once you get it performing to its peak, if it is insufficient for your particular usage regime due to the OEM Dell gimping, then consider alternative options. Personally, I enjoy modding and building computers, but again, it is not for everyone.

Very interested, can you drop a few photos of the nicer ultra high end machine?

You are following the same analysis path I did several months ago.  I also bought my R13 due to supply chain and pricing issues.  It was several months later the deficiencies surfaced, it is a good gaming machine but its not a great gaming machine.  Performance in demanding games is about 15-20% below similar specd machines, had to double-up on the aio fans so it would not thermal throttle in AC-Oddy, and on and on.....  That said, if I was able to cram-in a 4090 with minimal dremel work I would have kept it, mostly as to not lose much in my bad decision.   In the end I found it was much cheaper and easier to just sell it and build a nicer ultra high end machine.  

This is the last Alienware I will ever buy. The supply chain issues and employee discounts were the only reasons I made the purchase. I didn't anticipate it being that bad. 

This is what can be done with the Aurora R13, besides whining and complaining

Aurora R13 with MORA360 

I respect the engineering involved to get that Mora in!  However, that machine is still performance crippled with CPU power throttling, PCIe bus limits, 4400 ram limits, etc. 

Instead of whining, I sold off my R13 and built my own machine, my final cash outlay was less than the cost of a retail 4090.

I went with a Lancool-3 case which is about the same size as the R13 but with tons of space and open cooling that is whisper quiet at full throttle.  Asus z790 mobo, i7 Raptor easily running at all core 5.8ghz on a 360 aio, high speed ddr5 at cl30, full rail psu, and a power unlocked 4090 to drive a lg c2 at both 4k and 3840x1600.

I can still complain as a part of me wanted to get that 4090 up and running in the R13