SPCR

I see where at Silocon Acoustics the Pabst 80mm are rated at 12dba and the panaflo at 21dba I know if you devolt the panaflo they are silent at 7 but some of my panaflos won't devolt from my current psu, I know the pabst fan is 17.00 US $ but are they trly that much quieter than panaflo's at 12v?

I am thinking of using the pabst on my psu since it stinks too much at 5v and also using the pabst on my front case fan too at 12volts and leaving my cpu fan w/ the panaflo at 12v.

I tried wiring two panaflo's in series but sometimes they were not starting up all the way, plus I don't really want a fan controller sticking out the front of my bays.

Any thoughts?

frosty wrote:Any thoughts?

Yeah, firstly, I don't believe the 12dB figure - I;ve never tried one of these fans but I seem to remember people here and elsewhere say that it ain;t 12 dBA.
Secondly, in my PSU I wouldn't use a fan which at 12V has low cfm. The reason for this is when you get hotter than average weather (like there was in Europe recently) it's always good to have the extra emergency cfms to stop the PSU from overheating.

Just a few thoughts.
DonP.

frosty wrote:Any thoughts?

1. Some people remarked that different batches of Papst fans may perform differently.

2. Some people remarked that certain Papst fans click when undervolted. Seems that fewer people have this problem with Panaflos.

3. Try a fanmate if you have no need for external controls. I noticed that some of my 80mm Panaflos will not start / run when turned down all the way (approx 5V).

4. Pabst is a beer, I believe

Having just replaced "12dB" Papst fans with Panaflo L1A's, I say Panaflos are way to go. They are much quieter and the sound frequency is also much lower. I'm finally happy of my computer noise level. I am using Zalman MFC-1 fan controller with them.

Papst are overpriced and their quality has gone down LOT once they started to manufacture them in Hungary.

Just out of curiosity...are any of you using these fans for on a dual xeon machine?

I've just built a dual 2.4 and am looking to replace both CPU fans.

Panaflo should be quieter at same airflow than Papst, according to this new test: http://murobbs.muropaketti.com/thread.j ... msRange=15. That guy says that YS TECH FD1281252B-2A http://www.web-jussi.com/cgi-bin/sql/tu ... l?id=23735 is a little quieter than Panaflo L1A. Interesting, I will try that YS Tech some day.

tonalt wrote:Panaflo should be quieter at same airflow than Papst, according to this new test: http://murobbs.muropaketti.com/thread.j ... msRange=15. That guy says that YS TECH FD1281252B-2A http://www.web-jussi.com/cgi-bin/sql/tu ... l?id=23735 is a little quieter than Panaflo L1A. Interesting, I will try that YS Tech some day.

Could it be possible that the vendor hand-picked some of the fans?

Price is nice (~40% less than Papsts here), and I think that YS TECH has RPM monitoring.

Jan

lenny wrote: 4. Pabst is a beer, I believe

LoL! Indeed it is!

I've used both the Panflos and Pabst. Good panflos are quieter than Pabst, but I've found the quality of the Pabsts more consistent than the Panaflo.

Re: dual Xeon- I use the the 80 cm fans on 2 dual P3 set ups. Panaflo on one, pabst on the other. Undervolted using a Zalman MC-1, the Pansflo are notciably quieter.

UrbanVoyeur, LOL

Have a look at http://www.cpemma.co.uk/
The first graph is very interesting. Each manufaturer seems to keep a rather linear noise vs flow ratio. Note that values are from manufaturers figures.

From what I have read it seems that Papst nowadays have less quality in production, so noise varys a bit from fan to fan, where Panaflows fans have more tolerance (due to other bearing system). This makes panaflows more consistent from fan to fan and easy to manufacture at a lower cost.
The drawback with Panaflows is that the hub is bigger (giveing more dead space). This becomes more important the smaller the fan gets.
At 80mm the panaflows are great. For low noise fans (and low CFM) I personally recommend the 24V version (running at 12V or less).
I would say this is a better option than going for the low CFM Papst fans.

In general if you have the option to put in more fans and reduce the speed of fans it is better to have more fans at lower speed to get the same CFM (you can achieve lower noice levels).
Example:
1 single fan doing 30 CFM at 25 dBA.
2 fans doing 15 CFM each (total 30 CFM) at 15 dBA each (total 18 dBA).
This comes from the fact that CFM to dBA for a fan is a near linear curve while the decibel curve is logarithmic.
18 dBA is percieved as approximately half as loud as 25 dBA, so to put things simply if you replace a single fan with two fans you can get the same airflow with half the noice.
Perhaps I should say that the above is true for 80 mm fans. Reality might be slightly different for other sizes of fans, but I guess it should be pretty close.

Silvervarg

Bought a 8412NGL a year ago and was extremely impressed
with it's performance/noise ratio. So I bought another one and
guess what: CLICK-CLICK-CLICK-CLICK.....I can't use it
Still happy with the first one though.

During the same period I also bought five 4412NGL, and they
all worked very well (at 5.5V).

All my 80mm Panaflo L1A's chatter when mounted blowing side to side.

It's slight, but noticeable.

I've found the Papst fans to have no chatter, but they have a higher pitched noise to them. Plus their air flow is about the same as a 7volted Panaflo.

My personal favorites are PCPowerandCOoling's 80mm Thermasense and Verax 80mm. But the Verax is hella expensive.

-Ed

The ystech is definately very quiet. I'm using one of these 7-volted on my 1.8+ AMD oc to 2.6+ and it's survived 24hrs of prime95. This is in an unmodded Sonata!!!

At 12v you can hear wind but at 7v it's silent.

Gotta now decide if the L1A has enough flow to replace the 380S without overheating too much.

Panaflo L1A's should be enough, but definitely won't be @7volts.

-Ed

Doomer wrote: Papst are overpriced and their quality has gone down LOT once they started to manufacture them in Hungary.

I had Papst from Hungary and Germany. They did not differ.

Doomer wrote: Papst are overpriced and their quality has gone down LOT once they started to manufacture them in Hungary.

I had Papst from Hungary and Germany. They did not differ.

Doomer wrote: Papst are overpriced and their quality has gone down LOT once they started to manufacture them in Hungary.

I had Papst from Hungary and Germany. They did not differ.

Thanks all for adding to this request.

I am planning to somehow mount two 80 L's as intakes and run them a 6v each and watch temps compared to one at 12v, hopefully if I drop from 25 dba to 18 that way the last humming will disappear.

Then after totally finishing lining the case with roofers tape and foam I will check my temps before and after I isntall a SLK with artic siver. Why?
I dunno, its an obsessive compulsive kinda thing. :}

Thanks all for adding to this request.

I am planning to somehow mount two 80 L's as intakes and run them a 6v each and watch temps compared to one at 12v, hopefully if I drop from 25 dba to 18 that way the last humming will disappear.

Then after totally finishing lining the case with roofers tape and foam I will check my temps before and after I isntall a SLK with artic siver. Why?
I dunno, its an obsessive compulsive kinda thing. :}