@Hal_0008 :

ML120 Pro (no LED no RGB) - https://www.amazon.co.jp/Corsair-ML120-PC%E3%82%B1%E3%83%BC%E3%82%B9%E3%83%95%E3%82%A1%E3%83%B3-FN1041-CO-9050040-WW/dp/B01G5I6O4Q/ref=sr_1_1?__mk_ja_JP=%E3%82%AB%E3%82%BF%E3%82%AB%E3%83%8A&dchild=1&keywords=ml120+pro&qid=1593985217&sr=8-1

Corsair H60 - https://www.amazon.co.jp/Corsair-H60-2018-%E6%B0%B4%E5%86%B7CPU%E3%82%AF%E3%83%BC%E3%83%A9%E3%83%BC-AMD%E4%B8%A1%E5%AF%BE%E5%BF%9C-CW-9060036-WW/dp/B00A0HZMGA/ref=sr_1_1?__mk_ja_JP=%E3%82%AB%E3%82%BF%E3%82%AB%E3%83%8A&dchild=1&keywords=corsair%2Bh60&qid=1593985524&sr=8-1&th=1

FN920 is the older Corsair H60. The newer Corsair H60 (2018) is FN1190.

Got it, I'll try the newest models then. Though delivery in Japan is so freaking slow, may arrive 2 weeks later. Thank you! 

I'll go with one ML 120 Pro then. Much thanks!

@Anonymous 

Does it make a big difference in noise level to replace the front fan? Sometimes I am not sure if the fan noise comes from GPU fans or the front fan. 

Does it make a big difference in noise level to replace the front fan? Sometimes I am not sure if the fan noise comes from GPU fans or the front fan.

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I would suggest you verify which fans are "too noisy" before you started trying to replace ANY fans.

If your machine has a liquid-cooler that works, I certainly would not be messing around with the Top-Fan (as it is actually part of the Asetek-OEM Liquid-Cooler ).

Does it make a big difference in noise level to replace the front fan?

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I happen to have replaced only the front fan for now, the other two(CPU and top) remaining the original ones. From what I can tell now, I can confirm that the original front fan definitely contributed greatly to the jet-engine-level noise.

But it's like 30,000 being reduced to 20,000, it sure is quieter, but still sounds like a vacuum.

Hope it helps.

@Hal_0008 

Thanks a lot for your input! I do suspect the front fan contributes a lot to the overall noise since its installation location is very close to the exterior. I already have a H60 AIO liquid cooling so CPU fan noise is mostly gone. But GPU blowers and front fan seem to still produce some noticeable noise when gaming. 

Update:

All new components arrived and I have repalced them all. It turns out to be astonishingly quieter, makes me wonder why Alienware wouldn't do a better job in the first place.

However, as I play games, the top case becomes awfully hot, so I'm considering adding another Corsair ML 120 Pro to sandwich the radiator.

Try bumping up you fan curve.

@Hal_0008 :

However, as I play games, the top case becomes awfully hot, so I'm considering adding another  Corsair ML 120 Pro to sandwich the radiator.

Danger, danger! Apparently the recent fan profile settings in AWCC, may they be balanced or performance, will run your fans very very slow, resulting in astronomical temperatures. I first realized that when I jumped back onto using my R8 full time as my custom rig is being upgraded.

With performance profile in AWCC, my ML120 Pro was running at around 600RPM all the way till 60C. By then, even with blasting the fan, the temps take a long while to come down. Like @r72019 , you want to be more aggressive with the fan curve. The quietness of the ML120 Pro allows that without sacrificing acoustic comfort.