Best case fan bearing type?

As the title says, what is the best case fan bearing type and why? I've heard many people say that ball is the best. I want to hear your opinions.

On a side note, what is the difference between ball and 2 ball?

Thanks for your inputs!
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More about best case bearing type
  1. You don't need bearing fan. You need cooling and silence and for those things Noctua is the best. If you want silence and performance then take a look and read some opinions from customers http://www.newegg.com/Product/ProductList.aspx?Submit=ENE&N=100007998%2050012454&IsNodeId=1&name=Noctua
  2. I much prefer ball bearings over sleeve bearings. They last much longer and tend to run a little quieter. They do cost more, but I suggest the lifetime of a cheap fan with sleeve bearings is less than half that of a ball bearing fan.

    Ball versus 2 ball? Well, any fan actually has two bearings in its motor - one at the front where the shaft emerges from the motor and the fan blades are mounted, and another at the back end of the fan motor. A few fans are made with a sleeve system in one position and a ball system in the other. Their problem is they only last as long as the weaker part. Once the sleeve bearing wears out, it does not matter that the ball bearing is still just fine. So, some makers emphasize that they have NOT done this by specifying 2 ball bearings, or "all" ball bearings.

    sosfm makes a good point, too. What type of bearings is only one consideration in choosing a fan. Noise level generated and air flow rate (in CFM) are very important. In truth, the noise generated by the bearing system is quite minor until they wear out, and then you hear squealing. For the most port, noise is generated by the fan blade design. Fortunately, noise can be measured and specified as dB (decibels) at a given speed and airflow, so you can compare in the fan specs.
  3. Personally i prefer Fluid Dynamic Bearings(FDB) used in makes like Scythe and Thermalright.
    Yeah sleeve bearings have a shorter service life then most other designs.

    http://www.silentpcreview.com/Anatomy_of_the_Silent_Fan
  4. Have to agree with Davcon those are the bearings that they use in HDD's too.....

    The type of bearing used in a fan can affect its performance and noise. Most computer fans use one of the following bearing types:

    * Sleeve bearings use two surfaces lubricated with oil or grease as a friction contact. They often use porous sintered sleeves to be self-lubricating, requiring only infrequent maintenance or replacement. Sleeve bearings are less durable at higher temperatures as the contact surfaces wear and the lubricant dries up, eventually leading to failure; however, lifetime is similar at relatively low ambient temperatures. Sleeve bearings may be more likely to fail at higher temperatures, and may perform poorly when mounted in any orientation other than horizontal. The lifespan of a sleeve-bearing fan may be around 40,000 hours at 50 °C. Fans that use sleeve bearings are generally cheaper than fans that use ball bearings, and are quieter at lower speeds early in their life, but can become noisy as they age.

    * Rifle bearings are similar to sleeve bearings, but are quieter and have almost as much lifespan as ball bearings. The bearing has a spiral groove in it that pumps fluid from a reservoir. This allows them to be safely mounted with the shaft vertical (unlike sleeve bearings), since the fluid being pumped lubricates the top of the shaft. The pumping also ensures sufficient lubricant on the shaft, reducing noise, and increasing lifespan.

    * Ball bearings: Though generally more expensive, ball bearing fans do not suffer the same orientation limitations as sleeve bearing fans, are more durable at higher temperatures, and are quieter than sleeve-bearing fans at higher rotation speeds. The lifespan of a ball bearing fan may be over 60,000 hours at 50 °C.

    * Fluid bearings have the advantages of near-silent operation and high life expectancy (comparable to ball bearings), but tend to be the most expensive.

    * Magnetic bearings or maglev bearings, in which the fan is repelled from the bearing by magnetism.

    http://en.wikipedia.org/wiki/Fluid_bearing
  5. are magnetic ones any good? like this one? http://www.newegg.com/Product/Product.aspx?Item=N82E16835426025

    planning on getting it for my case. heard it should last up to at least 5 years or something.
  6. any good green led fans? trying to match them with my case \:
  7. would the loons or the sickleflows ( the cheap ones ) be sufficient for a push /pull rad ( 480 ) set up ?
  8. There are many solutions. I personally prefer ball bearings but depends on the specifications, the goal and budget.
    Here should be all solutions http://www.omniabearings.com/bearings , but as I said before it depends on your needs and the goal you want to reach.
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