Question for fan Gurus

[crmaris]

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?

[Tator Tot]

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.

[crmaris]

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.

[Tator Tot]

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.

[crmaris]

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?

[Tator Tot]

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.

[crmaris]

thanks again for helping me out in this! I will use the official naming scheme in my review then, Hysint bearing.

[Tator Tot]

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.

[rafal_iB_PL]

Does this fan make significant bearing noise in low RPM situations?

[Tator Tot]

Originally Posted by rafal_iB_PL

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.)