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intel BLACK (ground) -> DELL BLACK (ground)
intel YELLOW (12v) -> DELL RED (12v)
intel GREEN (tach) -> DELL YELLOW/white (tach)
intel BLUE (pwm) -> DELL BLUE (pwm)

DANGER WILL ROBINSON

Your picture shows the fans in the PSU as Dell WONKY non standard.

I think they do this on purpose so you fry the sensor as well as the fan if you just plug in without looking.

Blue YELLOW BLACK RED IS WONKY NOT STD

3 and 4 wire intel std

The wire order varies on some dell fans but the colors are valid blue is pwm , black is ground. wires are sometimes all black on dell fans. There is NOT a single standard for all DELL models.

https://noctua.at/pub/media/wysiwyg/Noctua_PWM_specifications_white_paper.pdf

https://landing.coolermaster.com/faq/3-pin-and-4-pin-fan-wire-diagrams/

Dell sometimes swaps the wires around so that you will fry a dell fan on standard and the other way round.

It has 5 pins but only 4 wires are used.

Dell does not publish this. And some dells use standard wiring.

I believe this is correct.

YMMV

4pin PWM on 3 pin

DELL FAN WIRES AND COLORS

So I did the splicing according to this:

Standard BLACK (ground)    -> DELL BLACK (ground)
Standard YELLOW (12v)      -> DELL RED (12v)
Standard GREEN (tach)       -> DELL YELLOW (tach)
Standard BLUW (pwm)         -> DELL BLUW (pwm)

The fans spins for a few seconds when the computer is turned on, then the fans stop. So I guess it did not work as intended. This really questions if me or my company will ever buy a DELL machine again. Not only is it a hassle that DELL doesn't follow industry standard, it is also super dangerous.

Most systems do fan test when turned on.

Fan doesn't run all the time. Power supplies in general are not user serviceable parts.  You dont fix them you replace them.

Dell, HP, Apple and other vendors don't do industry standard due to users swapping out 10 20 30 year old parts that are bad and then demanding service for free.

This is also why Intel changes sockets and chipsets all the time.

I have (again) been suckered in by yet another Dell on the cheap, thinking I can cobble together a nice (and quiet) workstation after applying some TLC.

Anyway, to cut to the chase, I also have a 825W PSU which has rattly cheap fans. In fact, all of the fans in my T5600 have seen better days. Following on from experience with a couple of Optiplexes, in which I tried unsuccessfully to replace various fans with Noctua equivalents, I have done a lot more research this time around.

Before, the usual health and safety brigade jump in with 'don't muck about with PSUs etc etc', changing a couple of PSU fans does not constitute 'mucking about with a PSU', especially with nigh on 30 years experience of repairing and troubleshooting electronics. I am also fully aware of the non-standard wiring and pinouts used by Dell.

After testing a whole heap of different fans (mostly Noctua) on a Dell 5 pin header, I was able to conclude that all Noctua PWM fans in my possession do not work with any Dell PWM header in any of the machines I own. When I say 'do not work' I mean do not work properly - ie. either the commonly experienced brief spin on startup then nothing or working but throws up F1 fan failure alert.

With further digging and reading via Google, I was able to find some instances where people were trying to use Noctua fans in other PWM applications without success. Turns out that, a couple of years ago, Noctua quietly changed their fans and no longer fully comply to the PWM specification - something to do with the duty cycle, if I remember correctly.  In short, it is almost likely that all current Noctua PWM fans will not work as replacement fans in Dell machines when plugged into a Dell board header (evidently including the PSU). 

This is a shame since Noctua consistently make the best performing (widely available) fans around. However, it is still possible to fix up a Dell with nice quiet fans. You just have to do a bit more searching! Hope this helps some people.

Hi.

Something has changed with the launch of the new Dell workstation.

I have Dell 5820 Core x Workstation with i7 9800X, 32 Gb Ram and Radeon Pro WX 4100. I use this computer in my home recording studio. As you know, silence is very important in this work. I replaced all the fans (2 system fans, one processor and one front) with Noctua fans. Unfortunately, the remaining fans of the 950 watt power supply are also very loud. The model of the power supply is: 0WGCH4. And as it turns out, they have power pins in the colors of other fans available on the market. They are even in the same order. 

Constructing an appropriate adapter was not a problem.

I can successfully confirm that the replacement of the fans in this power supply with the Noctua NF-A6X25 was successful. Now the system has become virtually silent.

It is amazing that Dell uses poor quality fans in its flagship products. And it is not about the noise of the flowing air. At low speed settings, it is hard to hear even on the default fans. Instead, you can hear a squeak - a sound that looks like a fridge. Most likely it is the sound of the motor or the ball bearing.

So I have the T5810 with the 685W PSU and was also trying to exchange the fans with no luck - at least not in PWM mode. I did a bit of measuring and seems like the frequencies of the tachometers are not the same, which is to be expected since the Delta fans installed by Dell have a much higher rpm and of course also draw a higher current.

Noctua NF-A6X25:

rpm: 3000
I: 0.12A
Max. tach freq: 87 Hz

Delta AFB0612EH:

rpm: 6800
I: 0.48 A
Max. tach freq: 233 Hz

The measured frequency also depends on how often the tachometer switches polarity in one 360° turn, so you can't directly translate it to  rpm in this case. Anyhow, it is not clear to me why the fans are not spinning at all. From the tachometer frequency the PSU should think that the fans are off and fully turn them on, but well.

I would suggest using the 3-pin version of these Noctua fans which come with an ultra-low noise adapter that limits the rpm. This will of course reduce the life of the PSU, but at least it will shut up.

I am glad that I did not pay anything for this computer. If I am ever to buy one, it will not be a Dell for sure.

Hi!  I have the EXACT power supply and I'm looking to do the same swap.  You used the Noctua NF-A6X25 PWM (4-pin) fans right?  Did you have any issues with it down the line?  Any complaints in the system BIOS?

Hi. Yes, I'm use the Noctua NF-A6X25 PWM fans. It's been over a year since I installed them and I haven't noticed any problems since then.

@B-Michael​ This is class, fans come tonight.  Next thing to tackle is the liquid cooling I should not have got, that thing is so noisy.  Now I know a fan based cooler will be quieter...... I put the Noctua fans on the case as well and wow what a difference.

EDIT:  on opening the PSU I have a 3 pin connector in there, going to have to hunt for some kind of adapter :(  PWM -> 3pin

EDIT EDIT:  In the end I used one of the fan headers from the mother board as I could not get an appropriate adapter.  The fans are near silent and it keeps the PSU plenty cool enough for casual gamer, but I work from home and the PC is on 12 hours per day+.  Its definitively not ideal as it should ramp up and down with PSU needs, but I got 2 replacement PSUs from dell and all 3 did the same thing so I was at my wits end.  1 week on and we are all good.  Just wanted to share alternative option for those not wanting to rewire.  

To be clear, the 2 new fans are inside the PSU housing (old ones removed), but the cables run outside the fan to the mother board header nearby.  NO MORE clunking! :)

@B-Michael​ hello,

I am planning to do the same as the fans are way too loud. Could you maybe provide a closer picture of the adapter that you did so I can soldere mine together? 

Thank you so much!!