Bump, same question here. I wonder if Jacob can share specs on the stock fans to help us find a good replacment.

Noctua NF-A12x25. The best 120 radiator fans one can buy.

Good discussion with links to tests
https://forums.evga.com/Buy-replacement-fan-for-3080-hybrid-m3183049.aspx
I usually go for ML-120 for RGB, LED.

BTW, standard ML-120 Pro RGB is 1600rpm, but you can get faster 2400rpm version that comes with their H100i AIO here
 

Obv the a12x25 if you can find them.
Corsair ml120 pros are also very good. 

 
Only problem with those Noctua NF-A12x25 fans is the fugly light & dark brown colors. I don't think that model comes in anything else. They're good, but ugghh... fugly. I mean look:
 

 
  and now this:
 
                           yeah...            
 
 
 
 
 
 
 

I'm using 9 of of these. They are pretty quiet and push a ton of air through my 3 radiators. As I type I can feel the air flow coming from my case sitting on my desk lol -- Some options might be better, but this one was way cheaper and i'm happy with the performance i'm getting.

 
I am using ML120s in push pull, you can get them in two packs and you won't have to run them as high to sustain lets say 55Cish. 
 
https://forums.evga.com/EVGA-RTX-3080-FTW3-Hybrid-kit-unboxing-and-installation-gallery-m3174307.aspx
 
Testing with 370W of sustained load. 
 
https://forums.evga.com/E...PushPull-m3174809.aspx
 

Subjective and unscientific testing.  All my systems have been closed cases with filters.  I use static pressure fans for everything since I use positive pressure case setups.
 
QUIET WITH MINIMAL WIND NOISE - GOOD PERFORMANCE
Arctic P12 PWM PST CO 1800rpm 2.2mm
Noctua NF-F12 PWM chromax   1500rpm 2.61mm
Noctua NF-P12 redux-1700 PWM  1700rpm 2.83mm
 
SLIGHTER LOUDER WIND NOISE AT 100% - BETTER PERFORMANCE (Works well with arctic freezer II 360 top mounted pull intake in Phantek P500A)
Noctua NF-F12 PPC-2000 PWM  2000rpm 3.94mm
 
LOUD WIND NOISE AND FAN HUM at 100% - BEST PERFORMANCE
Corsair ML120 & Pro  2400rpm 4.2mm
EK Varder F120ER PWM 2200rpm 2.75mm
 
KP using ML120s as pull and Artic P12 as push with primary PWM sensor from a P12 for all 6 fans.  Temporary setup but effective with 25c house AC or 14c using forced custom duct portable AC.  Normal gaming uses a custom fan curve in PX1 with ext fan hub with PWM control going to KP.
 
ML120 at 100% is like a wind tunnel.  Only thing worse is Panasonic Panaflo HI or industrial fans.  Noctua PPC-3000 should performance well, but expect to be louder than ML120s.
 
I like these simple, cheap fan hubs:
SilverStone CPF04 INTRODUCTION (silverstonetek.com)
 
I have these on order to test:
Nidec Servo GentleTyphoon 120mm Case Fans (2150 RPM 4pin PWM)
Fan&Blower09 (nidec-servo.com)

808sting
Subjective and unscientific testing.  All my systems have been closed cases with filters.  I use static pressure fans for everything since I use positive pressure case setups.
 
QUIET WITH MINIMAL WIND NOISE - GOOD PERFORMANCE
Arctic P12 PWM PST CO 1800rpm 2.2mm
Noctua NF-F12 PWM chromax   1500rpm 2.61mm
Noctua NF-P12 redux-1700 PWM  1700rpm 2.83mm
 
SLIGHTER LOUDER WIND NOISE AT 100% - BETTER PERFORMANCE (Works well with arctic freezer II 360 top mounted pull intake in Phantek P500A)
Noctua NF-F12 PPC-2000 PWM  2000rpm 3.94mm
 
LOUD WIND NOISE AND FAN HUM at 100% - BEST PERFORMANCE
Corsair ML120 & Pro  2400rpm 4.2mm
EK Varder F120ER PWM 2200rpm 2.75mm
 
KP using ML120s as pull and Artic P12 as push with primary PWM sensor from a P12 for all 6 fans.  Temporary setup but effective with 25c house AC or 14c using forced custom duct portable AC.  Normal gaming uses a custom fan curve in PX1 with ext fan hub with PWM control going to KP.
 
ML120 at 100% is like a wind tunnel.  Only thing worse is Panasonic Panaflo HI or industrial fans.  Noctua PPC-3000 should performance well, but expect to be louder than ML120s.
 
I like these simple, cheap fan hubs:
SilverStone CPF04 INTRODUCTION (silverstonetek.com)
 
I have these on order to test:
Nidec Servo GentleTyphoon 120mm Case Fans (2150 RPM 4pin PWM)
Fan&Blower09 (nidec-servo.com)

The whole goal of a radiator should be that you don't have to run something at 100%. My fans run max 65% and my GPU temperatures max out at 52C with Cyberpunk 2077. Here this is 370W sustained load looping Timespy.
 

 
From my test, Boost 4.0 maxes out like at 55C and under. You don't get anymore performance once you're under 55C.
 
Running the fans at 80-100% is not that beneficial performance wise and will also introduce a lot of dust into your system that's unecessary.
 
I recommend running them at 60-70% and that's it. 

When I'm benching, I'm running full blast with forced AC.  Thought about Koolance Chiller with HC, but waste of money for how much I'd use it.
 
Most of the time, I'm running 60-80% in games.  But my custom fan curves start at minimum 40% duty cycle.  All my hybrids don't go over 55c in normal games and max in the mid 30s when benching.  My 3090 FTW3 air cooled hits mid to high 60s C in gaming.  Installing hybrid kit soon, but my FTW3 is average or below.

Nereus
 
bequiet! Silent Wings 3 - high speed PWM fans..  good static pressure, and low noise. Be sure to get the high speed PWM model for the static pressure for radiators, the other ones make great case fans though. Amazon and Newegg usually have stock.
Links: Amazon 120mm PWM high speed
          Amazon 140mm PWM high speed
 

 

     I have two of them in a push/pull on my AIO.  Anybody that cares about good static pressure AND silence should go for these guys.

I'm using a pair of Arctic bionix p120's and they work well.

I have NF-F12 industrialPPC-3000 PWM for all of the 120mm fans in my system and two NF-A14 industrialPPC-3000 PWM. They are stupidly loud at full speed but as @KingEngineRevUp noted "The whole goal of a radiator should be that you don't have to run something at 100%". For any fan you get you should look at its characteristics and then build a fan curve around that performance profile (assuming you are using a fan controller). For radiators you'll want to look for fans with good static pressure performance across their RPM range. The NF-F12 industrialPPC-3000 have an extremely high 7,63 mm H₂O static pressure at full RPM. As such I have my fan profiles set to 0 until 40° C, and then 500rpm with 200rpm increments for every 5° until the temperatures reach the within 2° of the max recommended temperature for my CPU. In most cases the fans stay below 1200rpm and are fairly quiet at that rpm. This essentially works as an audible alarm for me if there is something wrong. For most people I'd recommend the retail versions or chromax fans as they are more focused on noise level and will be quieter at any given rpm.
 
The Corsair ML120 are also good as mentioned and have good static pressure across their rpm range and will be quieter than the NF-F12 (either normal retail or industrial) in most typical scenarios. The only other fan I'd recommend for radiator cooling performance / noise level would be the EKWB Meltemi 120ER Black (500-1800rpm) if you have the room for the thicker 38mm profile. They are very quiet for most of their rpm range with good static pressure at lower rpm.

Ranmacanada
Arctic P12 PMW.  They have great static pressure, extremely low noise, and don't have the Noctua price.  Arctic makes great products and they have extremely low prices.  The fans also have an extremely long warranty.

I bought two 5 packs of arctic PWM PST 120mm fans last year.  4 of the 10 fans have died already.  Yes a 40% failure rate after 1 year.  It costs more in shipping to get the fan replaced than what the fan is worth.