Question 1

Does this come with any molex adapters or do we have to buy those separate?

Accepted Answer

Unlike Noctua, which provides a lot of extrtas in the box, although no Molex adapter, the Cooler Master fans comes as pictured. A 3 pin fan w/out any PWM control. Nor will these ramp up to 2,000 rpm & if could, without a doubt, be the loudest component in one's system.

While Cooler Master does have some good offerings (cases & CPU coolers), their fans aren't among the list. Plus by the time one swaps the fan on one of their coolers to a Noctua, could had purchased the Noctua cooler with fan for less. Am speaking of first hand experience, not hearsay. Just like everything else, we get what we pay for. Sure if in a pinch, these are better than nothing, just begin saving for quality replacements, the Noctua NF-12 is the perfect replacement.

Question 2

Do these fans come with 4 pin to 3 pin adapters?

Accepted Answer

No adapter, although these still can be ran on a 4 pin fan header. Will simply run at full speed, unless there's an option in the MB's UEFI or BIOS to control speed, or a software option is offered as part of a bloatware package (tuning software that in unskilled hands, causes BSOD's).. You get what you see & no more.

Question 3

dimensions of fan. I need 9 centimeters X 9 centimeters. Is this fan
the right size?

Accepted Answer

you need a 90mm fan. This is a 120mm fan. This is not the correct fan. Go search for a 90mm fan.

Question 4

These fans have 3 pin connectors, my motherboard has 4 pin connections.  Can I plug these fans directly into the 4 pin connections and just have 1 pin open, or do I have to also buy an adaptor that mates 3 pin to 4 pin?

Accepted Answer

The fan headers have 3 to 4 pins. The common pins are the "Ground" pin, the "Power" pin, and the "sense" pin.

The main difference is going to be the 4th pin known as the "control" pin. This pin can actually automatically control the fan speed. Also known as a PWM (Pulse width modulation) connector. If it is indeed a PWM connector then it must be used with a 4 pin fan aka a PWM fan in order to utilize the PWM functionality.

A 3 pin connector has the ground, power, and sense pin mentioned earlier. Any fan connecter to these headers will run at full speed by default. You are able to look at the RPM of the fan by use of the "sense" pin. Fans using a 3 pin connecter can be controlled manually using software like "fanspeed".

So, to sum up difference.

4 pin header = ability to use PWM fan = automatically adjust fan speed based on whatever variable (typically temperature) 
3 pin header = full speed by default = can control by means of software or fan controller

Question 5

Is it included 4 fan? or just 1 fan? First photo is 4 fans but box is not explained exactly

Accepted Answer

Hello: Yes, this is a 4 pack of fans. They generally work well for the price; I would say they have a tendency to get a bit noisy 6-9 months into their life. Otherwise they're inexpensive and move a lot of air for the price.

Question 6

Do you get one or four fans?

Accepted Answer

I bought the four pack use one of them on my 212 CPU Cooler the rest for case ventilation work like a charm still in use today

Question 7

Do the fans come with mounting screws, or do people need to purchase those separately?

Accepted Answer

Hey come with the screws, and a few spares if I remember correctly.

Question 8

Operating voltage?

Accepted Answer

All pc fans are 12vDC. you can add a control that will provide a lower and quiter fan speed. But that also slows the air flow when that's done.

Question 9

How many watts does each fan use?

Accepted Answer

Its a 7 blade fan with no fins so dont expect much.
Specs on the box are
Dimensions are 120x120x25mm.
Voltage : 12v DC
Current : 0.15A +/-10%
Power input : 1.8Watt +/-10%
R.P.M. : 1200 +/-10%
Airflow(CFM)  : 44.73CFM
Air Pressure : 1.65mmH2O
Noise : 19.1 dB.A

Bearing : Sleeve

Life : 30,000Hours

Cable length : 300mm.

Off these,the noise rating is real as i barely hear these fans.

The CFM is not true as I have a 55cfm scythe which displaces almost twice the amount of air as compared to this fan(no testing done,just placed my hands in front of both the fans at the same time.),both fans running at 12V from PSU.

U get a 3 pin plug running with a cable which is 30cm long,which is enough if u have a mid tower case.

Life time is rated at 30,000hours.That is more than the time most of the users use a set of fans.

If u are running a lab,internet cafe,etc. where you have a lot of computers or you are just the average user,this is a good option.cheap and long lasting.

Performance enthusiasts,gamers,folders,etc. who use air cooling,you might want to go for a better fan.At this CFM,you wont be moving enough air to cool the heat produced by your system.

Not good for radiators and heatsinks as static pressure isnt good.
" This is info coped from google ing  if it helps"

Question 10

How many watts does each of these use?

Accepted Answer

From the back of the box:
1.8 Watts (12 Volts +/- 10%  x  0.15 Amps +/- 10%)

Also:
Fan size: 120x120x25mm
Speed: 1200 RPM +/- 10%
Air Flow: 44.73 Cubit Feet per Minute
Air Pressure: 1.65mmH20
Noise: 19.1 db-A
Weight: 120g
Bearing Type: Sleeve
Life: 30,000 hours
Cable Length: 300mm

Brand	COOLER MASTER
Series	Silent Fan
Model	R4-S2S-124K-GP

Fan Counts	4 Fans
Fan Controller	No Controller
Type	Case Fan
Compatibility	Case
Fan Thickness	25mm
Bearing Type	Sleeve
RPM	1200 RPM +/- 10%
Air Flow	44.73 CFM
Noise Level	19.1 dBA
Power Connector	3 Pin
Color	Black

COOLER MASTER R4-S2S-124K-GP Silent Case Fan (4-Pack)

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Item#: N82E16835103052