Question 1

How do these compare with the cooler master ones that are nearly identical? I meant to buy the cooler master 4-pack for a new case i'm building, but accidentally bought these. They look identical and i haven't tried them out yet, but i'm more concerned with longevity as i haven't had the cooler master ones long and i want to put the longer lasting ones in my new case as the fans are a little tricky to access.
Thanks.

Accepted Answer

Well 5 main important facts (that are obvious in product descriptions) are:
1] CFM (how much air they move) CM's are 44.73 & Rosewill are 38.2; hence the "Super" Silent. Basically they rotate at a lower RPM thus making them more quiet. Blade design plays a major role, but as you stated, they look identical because they are. It's all about voltage control on the onboard chip that allows them to rotate a little quicker on the CM fans.
2] The CM's have a logo sticker in the middle of the fan whereas the Rosewill do not. I personally don't care too much for logos in the respect I like the "stealth / blackout" style of building.
3] Although they BOTH are Sleeve bearings, Rosewill CLEARLY states "Long life sleeve." Maybe because of lower CFM's/RPM's? I don't know
-The next 2 point's are MY reason for buying them:
4] The wires on the CM's are color coded and pretty short compared to the Rosewill which is ALL black, VERY long.
5] The Rosewill's have 3-pin AND Molex connectors. Your choice for whatever type of build you're building, whereas the CM's ONLY have a 3-pin connector.
Hope this helps.
BTW, I usually buy these in 4 packs when they are on sale for $9.99 (I have bought 4x 4 packs for various builds and am currently running 3 on the side of my INWIN Dragon Rider case and have never EVER had any one complaint or noise issue from ANY of the fans I have ever used from Rosewill. Rosewill actually are a product conscious company that actually test their own products and improve upon their stuff by daily usage. You can tell by their designs that Rosewill are computer enthusiasts.
Cheers
-Chris

Question 2

Will these work with a fan contoller?

Accepted Answer

Long as it got same kind of plug intake i don't see why.(unless u don't mind Rewireing)

I use the fan's i got as Temperature Control  in  a 120 Egg Incubator.

Question 3

what is the depth of this fan?  What is the 3rd wire in the harness used for?

Accepted Answer

3-wire PC Fans
[Click to enlarge]
A 3-wire PC fan
[Click to enlarge]
Yet another 3-wire PC fan with different wire colors

A very common type of PC fan. These fans introduced the "tacho" for the first time. The first two wires are the power supply of the fan. The third wire, comes directly from the output of the Hall sensor. This output generates 2 pulses per one revolution of a fan. The fan is then connected to the motherboard. From the third wire, the motherboard can "read" the tacho of the fan and see if the fan is running and with how many RPMs! It is a great innovation! If the motherboard sees no pulses or very low rpm, then the characteristic buzzer sounds to inform the operator that something is not ok. The internal diagram of a typical three-wire fan is as follows:

BLACK: Negative
RED: Positive
YELLOW: Tacho 
Or
BLACK: Negative
YELLOW: Positive
GREEN: Tacho

Question 4

how long are the cables on these fans?

Accepted Answer

Around 6 -8 inches. I used a converter and connected them to the power supply via a Molex connector.

Hope this helps,

Question 5

22dBA for each fan or total?

Accepted Answer

Decibel ratings are not linear and therefor cannot be added or multiplied in simple order or in other words you cannot do 22 + 22 = 44. They would have sound calculated on an exponential curve. You would have to look up something more akin to a geometric formula. For example the sound curve might start with a sharp incline and then level off.
However consider that several fans on low would have increased air flow with less fans then one fan trying to move the same air flow at a higher speed.
As for the particular fans you are looking at I bought the exact same fan pack and found using one 120mm fan made less noise the the 80mm I replaced. This is mostly because my motherboard can control the fan speed and with the larger fan it tends to run on low now most of the time. Also the 22dBA is at max speed. My motherboards have both a front fan and rear fan connector so I used 2 of 4 for two boxes. I did have one box that had small holes for the front fan position that makes the fan have to work harder making more noise. 
since the case had a cover where I would never see this under the front cover I took a be-metal hole saw and just cut a nice round  hole, Perfection! Think of it the same way a vacuum gets loud when it gets plugged up and sucks harder.
Oh yea I liked these fan and they are Quiet!!! I run 6 computers at my home, of these 5 are my own build and one Dell OEM. Rosewill has so great cases too I have purchased
James Niland

Question 6

What are the electrical specifications of these fans?
voltage, amps

Accepted Answer

DC12V 0.16A

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