It is currently Thu Nov 20, 2014 2:15 pm

All times are UTC - 8 hours




Post new topic Reply to topic  [ 8 posts ] 
Author Message
 Post subject: Best fan with SLK-800
PostPosted: Sat Nov 09, 2002 8:34 pm 
Offline

Joined: Sat Nov 09, 2002 1:45 pm
Posts: 149
Hey guys!

what's the best fan to use with SLK-800?

I have P3 1ghz running at 133mhz.

Quietness is the utmost priority over performance.

Actually, I wanted to clear out something. Is bigger fan rotating slower quieter than smaller fan rotating faster?

If so, I was thinking of getting couple of those 120mm fans (one for SLk-800 and another for intake).

let me know what you guys think!


Top
 Profile  
 
 Post subject:
PostPosted: Sat Nov 09, 2002 10:15 pm 
Offline

Joined: Sun Aug 11, 2002 3:26 pm
Posts: 333
Location: Melbourne, Australia
probably a Panaflow FBA0812L1A (have I got the number right guys?) the low speed panaflow........
- Bigger fan rotating slower is quieter cause less RPMs = less air turblence
:) have fun welcome to the world of quiet computing

_________________
Nothing is impossible: Somethings are not worth the effort to achieve.


Top
 Profile  
 
 Post subject:
PostPosted: Sat Nov 09, 2002 10:40 pm 
Offline
Site Admin

Joined: Sun Aug 11, 2002 3:26 pm
Posts: 11936
Location: Vancouver, BC, Canada
Quote:
Is bigger fan rotating slower quieter than smaller fan rotating faster?

I don't believe you can generalize; the noise/airflow/cooling is specific to the components & situation. In yours a Panalfo even at 5V will probably work OK. And it will be silent.


Top
 Profile  
 
 Post subject:
PostPosted: Sun Nov 10, 2002 6:40 am 
Offline

Joined: Sat Nov 09, 2002 1:45 pm
Posts: 149
heymike,

what do you suggest? i think my cpu (p3 1ghz w/ 133mhz bus) will dissipate about 50w. which fan should i put on top of the heatsink? one in particular? dang... these fans are pretty expensive... any good sites where you get them?

thanks alot mike. i love your work!


Top
 Profile  
 
 Post subject:
PostPosted: Thu Nov 21, 2002 11:17 pm 
Offline
Patron of SPCR

Joined: Sun Aug 11, 2002 3:26 pm
Posts: 428
Location: San Francisco, CA
I must jump in. Bigger fans are LOUDER at the same RPM. For example, the famous black label 60mm delta (38cfm) was about 6800rpm and 48.5db. The 80mm 68cfm I believe is 4700rpm and around 48.5db as well (approximate off the top of my head guesses). As you can see, the rated noise is the same yet the bigger fan rotates slower. Do not confuse bigger fans = more cfm for the same noise (true) with bigger fans = quieter because they spin slower. Bigger fans are louder per spin, but create more cfm per db. So in actuality, bigger fans are louder per rpm, and therefore harder to silence as much as smaller fans.

There may be flaws in my argument but I believe most of what I said to make sense. Please comment if you think otherwise.

-Ken

P.S. To answer the question, since you said quietness is the most important aspect, I would go with a panaflo 80mmL1A @5v over your slk-800. Any similar easy to find fan will do as well (silencer, stealth, papst, ect.)


Top
 Profile  
 
 Post subject:
PostPosted: Fri Nov 22, 2002 1:03 am 
Offline

Joined: Sun Aug 11, 2002 3:26 pm
Posts: 333
Location: Melbourne, Australia
I'd agree that some of the bigger fans are louder at the same RPM Ken but I think there's a optimal fan size for the best balance of noise and the size of the blades
but bigger fans you get to spin slower if they have good bearings on them to the point where they pump out a lot of air and VERY low RPMs.......
Personally I think 80MM is the best size for the fans for a balance between the two.... 60MM is too whiny and 92MM is too loud.... :)

_________________
Nothing is impossible: Somethings are not worth the effort to achieve.


Top
 Profile  
 
 Post subject:
PostPosted: Sun Nov 24, 2002 4:51 pm 
Offline

Joined: Fri Nov 01, 2002 11:31 am
Posts: 20
Location: San Jose, CA USA
[quote="Gxcad"]I must jump in. Bigger fans are LOUDER at the same RPM. For example, the famous black label 60mm delta (38cfm) was about 6800rpm and 48.5db. The 80mm 68cfm I believe is 4700rpm and around 48.5db as well (approximate off the top of my head guesses). As you can see, the rated noise is the same yet the bigger fan rotates slower. Do not confuse bigger fans = more cfm for the same noise (true) with bigger fans = quieter because they spin slower. Bigger fans are louder per spin, but create more cfm per db. So in actuality, bigger fans are louder per rpm, and therefore harder to silence as much as smaller fans.

[quote]

Actually there are several factors that contribute to the noise of a fan. What makes fan noise unacceptable is a combination of pitch and volume. Much of the noise is created by the air hitting obstructions in the flow path, by imperfections in the blades, and by the tips of the blades themselves. Larger fans create sound that is lower in pitch by virture of the longer path the air takes through the blades. Larger fans have a smaller % of restriction caused by the fan case and the supports which means lower noise per rpm from that cause. Your general statement that "bigger fans are louder per spin" is not necessarily true. They are much easier to silence than smaller fans to product the same work (CFM) with more pressure through the system. If you would like to learn more about the general subject, read http://www.amdmb.com/print-article.php?ArticleID=132.


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 8 posts ] 

All times are UTC - 8 hours


Who is online

Users browsing this forum: No registered users and 3 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
Powered by phpBB © 2000, 2002, 2005, 2007 phpBB Group