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Old 03-12-2012
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Default Question for fan Gurus

I have a PSU on the bench and according to the official spec sheet its fan has HDB (Hydro Dynamic Bearing). Once I opened the unit I noticed that the fan is a plain Young Lin Tech which has this model number DFS132512M and according to its maker it has sleeve bearings. So what's going on?

I attach a photo of the fan itself. Is it a newer model or what?
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Old 03-12-2012
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Jonny & I had this discussion in another thread, it's not actually a Hydro Dynamic Bearing but it's Young Lin's Hysint bearing.

They use the DFS name for both Sleeve & Hysint bearing fans; with no way to tell them apart besides taking one apart.

The bearing itself is more like a traditional rifle bearing than a Fluid / Hydro Dynamic design.
It's a step above sleeve, but not on par with a HDB / FDB bering.
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thanks for the answer. This is a shot of the shaft. It looks like HDB because of the V-shaped curves on the shaft so most likely Young Lin Tech is right about this.
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Technically, the chamber has to be sealed for it to be an HDB. Like I said, it's more like a Rifle bearing than an actual FDB/HDB.

The bearing type is Hysint, which is their own name for the bearing type.
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Hm yeap it is not sealed indeed. I posted more photos of the fan.
This shaft also doesn't have spiral curves but straight ones so it isn't riffle bearing. Hysint bearing isn't supposed to be a riffle variant one?
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It's supposed to be an upgrade over a traditional rifle design, but cheaper than an FDB/HDB fan.

Like I said, it's got more in common with a rifle bearing, but it's not a rifle bearing.

There's a lot of these "sleeve 2.0" designs out there, where they make minor tweaks to a sleeve or rifle design, then give it a fancy name. It's just easier to group them with the design they most closely resemble.

There's only a limited number of guys making FDB fans.
Delta, Panaflo Protechnic, & ADDA are the big ones.

I think there may be two guys who I'm forgetting, but those 4 are the big ones who get rebranded into the market the most.
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thanks again for helping me out in this! I will use the official naming scheme in my review then, Hysint bearing.
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No prob.

I just wish YLT would use DFH as the part number for the fan, instead of DFS. As that would keep confusion down.
Though, I also wish certain companies (Cougar & Cooler Master specifically) would stop calling their fans HDB / FDB when they're not.
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Does this fan make significant bearing noise in low RPM situations?
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Quote:
Originally Posted by rafal_iB_PL View Post
Does this fan make significant bearing noise in low RPM situations?
From my experience, the noise isn't significant but it's definitely there. Though, it's low enough that encased in a case, you won't really notice it. (Even all mesh cases like the Fractal Design Arc series, or Antec Gamer series.)
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