Tip-Magnetic Fans

[tuesday630]

Tip-Magnetic fans seem to make a lot of sense - more air volume and less noise. Here's a link if you're not familiar with them <A HREF="http://www.tmdfan.com/" target="_new">http://www.tmdfan.com/</A>

Does anyone know why Swiftech stopped selling their MCX line of heatsinks with this fan? Actually, they dropped adding any fan at all. I'm just wondering if there was a problem with the tip-magnetic fans or some other reason.

Here's a link to Swiftech's note on this (with very little info) <A HREF="http://www.swiftnets.com/TMDfanalert.asp" target="_new">http://www.swiftnets.com/TMDfanalert.asp</A>

<P ID="edit"><FONT SIZE=-1><EM>Edited by tuesday630 on 01/20/03 04:48 PM.</EM></FONT></P>

 

[svol]

There where some problems with the fans that make them fail or something. I can try to find the news article about it if you want.

My dual-PSU PC is so powerfull that the neighbourhood dimms when I turn it on

 

[tuesday630]

Sure, if you can find info, that would be great. I have not been able to find anything on this. Thanks.

 

[Lonemagi]

No need for an article, I got one of the 70 mm ones for my swiftech heatsink, it worked as good as I thought it would.... until it decided to not start spinning one day on startup. It still works, but I don't trust it for my CPU anymore. I have also heard that these are not that great for cpu use as the amount of torque generated when it starts up is many times more than your average fan.

I also have been told of them drawing too much power from the motherboard, so if you do go with one, connected to a PSU lead.

<font color=green>::: Sir, I'd like to return this cpu, it is dead.</font color=green> <font color=blue>::: Its not dead, its resting...</font color=blue>

 

[phsstpok]

I've got a TMD fan, the 40 CFM 70mm version, on my CPU now.

Here are the two stories (rumors) that I have heard.

1. The TMD fans can draw 0.8 amp at initial spin-up. If this is true this would burn out the fan header on most motherboards which can only handle 0.35-0.5 amp.

2. There is a pontential ground problem with the fans. The fan is plastic body with metal cover. Supposedly if the cover is grounded the fan will short out. I suspect this can only happen if the screws are over tightened pressing the metal cover against internal wiring.

Anyway, I've been using one of these fans for 4-5 months. I power it from a molex connector just in case that theory 1 is true. No problems so far except it seems to spin at 6200 RPM not 5500 as specified. Despite the high noise spec, 39 dBA, this fan is fairly quiet. It seems about 1/3 as loud as the 7000 RPM Delata fan I previously used. Not sure about this but I can definitely listen to television while this fan is running. I couldn't when the Delta fan was in place.

<b>99% is great, unless you are talking about system stability</b><P ID="edit"><FONT SIZE=-1><EM>Edited by phsstpok on 01/20/03 08:50 PM.</EM></FONT></P>

 

[lhgpoobaa]

Yeah, an interesting idea, but needs more work, especially with reliability.

And the problem lies with having the magnets located on the outside edge. As the fan spins you are going to generate ALOT of angular momentum which will limit its speed, and as its going so fast you cant have the bearings on the outside, they still are in the middle, abeit alot smaller.



<b>Despite the huge top speeds, amazing acceleration and incredible G-Forces of Top Fuel Dragsters, a standed riced up Lancer often has a larger rear wing.</b>

 

[tuesday630]

Thanks. These are all interesting. I sent an email to YS Tech inviting them to set us straight if this info is wrong. We'll see if they show.

---There may be more than one way to do it, but why would anyone want to remove the fur from a feline?---

 

[phsstpok]

You'll find the answer at <A HREF="http://www.overclockers.com" target="_new">http://www.overclockers.com</A>. (I'll get back with an exact link, have to excuse myself for the moment).

I was right, YS Tech seems to be claiming that it is a installation issue and that the fans are not defective but tighten the screws too much and you damage the fan causing a short.

No confirmation on the inrush current issue.

<b>EDIT</b>

OK, I'm back.

Here's the <A HREF="http://www.overclockers.com/articles639/" target="_new">link</A>. It contains accounts of individuals who had problems with TMD fans. At the end someone provides an alleged response from YS Tech.

<b>99% is great, unless you are talking about system stability</b><P ID="edit"><FONT SIZE=-1><EM>Edited by phsstpok on 01/21/03 02:44 PM.</EM></FONT></P>

 

[svol]

Can't find the original article... but I can give you a cut-out from a newssite that linked to the article.

Update: After our discovery of the Y.S. Tech TMD fans getting recalled last night, Swiftech is the first reseller to make a statement. In their news release, they will be returning all units to Y.S. Tech, just as we reported, and refunds are possible. It is highly recommended to those using this fan to refrain from using them any further. (that is my personal opinion, as only defective units will be returned)

[...]

Defective fans are to be sent back to the original point of purchase, either for refund or exchange against a fan of similar value, at the discretion of the retailer.

---

The cause is that the fan spins so hard that the copper wires melt. This news is from september 2002... so it could be that everything is solved by now.

My dual-PSU PC is so powerfull that the neighbourhood dimms when I turn it on

 

[lhgpoobaa]

Put simply, standard ball and slieve bearing fans arnt going anywhere. they have their drawbacks, but are relaible and long lasting.

<b>Despite the huge top speeds, amazing acceleration and incredible G-Forces of Top Fuel Dragsters, a standed riced up Lancer often has a larger rear wing.</b>