overclockers.com has good article of how to tidy a case

Pjotor · Post by **Pjotor** » Wed Dec 15, 2004 11:21 pm

Cheap, Clean, Cool and Quiet Case Cooling

Actually, most of it is semi-old news to SPCR regulars, but nevertheless a good starting point for newcomers.

grandpa_boris · Post by **grandpa_boris** » Thu Dec 16, 2004 2:21 am

Pjotor wrote:Cheap, Clean, Cool and Quiet Case Cooling

Actually, most of it is semi-old news to SPCR regulars, but nevertheless a good starting point for newcomers.

7 fans?

burcakb · Post by **burcakb** » Thu Dec 16, 2004 3:25 am

I wonder how he got his sound measurements ?!?!

Post by **Ralf Hutter** » Thu Dec 16, 2004 6:28 am

Overclockers Article wrote: it measures 55 dB from 3 feet away before the cooling modification, and 39 dB after the mod.

...And I can't quite make out the PSU, but it must be a fixed speed version and the author's obviously not concerned about feeding it a steady supply of 40°C+ air.

You certainly gotta give him Brownie Points for his thought and effort though.

Pjotor · Post by **Pjotor** » Thu Dec 16, 2004 6:55 am

Brownie points -- is that good, bad, or ironic?

Post by **Ralf Hutter** » Thu Dec 16, 2004 7:04 am

Pjotor wrote:Brownie points -- is that good, bad, or ironic?

"Brownie Points" is good. IIRC, Brownies are pre-Girl Scouts and they earned these points for doing good stuff. Anyone that can help fill in the details, you're welcome to it...

Pjotor · Post by **Pjotor** » Thu Dec 16, 2004 12:26 pm

Staying off the topic -- interesting about the origin of brownie points (I'm a linguist and a translator, so I'm supposed to be). The reason I asked was that I thought it might be a derivation of "brown nosing", which would make your comment really sarcastic...

teknerd · Post by **teknerd** » Thu Dec 16, 2004 4:04 pm

While the article does have some good points, the author obviously doesnt know much about sound measurement, seeing as he noted that a 16dB drop in noise was only a 29% drop.

hvengel · Post by **hvengel** » Thu Dec 16, 2004 7:34 pm

If you think about the typical PC air flow it is much like this machine - other than the cold air CPU duct. All he really did was to use ducts and internal fans to better focus that air flow. In effect the cooling air is used in a sequence (HDD ==> GPU ==> chip set ==> PSU & CPU ==> PSU). It also seems to me that the PSU is an air flow bottle neck that results in increased air flow impedence. Thus he needs more fans to have enough air flow. Would it not be better to use ducts to divide the cold intake air into seperate streams for each device that needs cooling and then vent that warm air from each device out of the case?

Sleeper · Post by **Sleeper** » Fri Dec 31, 2004 1:43 pm

teknerd wrote:While the article does have some good points, the author obviously doesnt know much about sound measurement, seeing as he noted that a 16dB drop in noise was only a 29% drop.

teknerd, you may need to check your math.
A 29%dB reduction from 55dB is 16dB

peteamer · Post by **peteamer** » Fri Dec 31, 2004 1:50 pm

He He He

... [sits quietly on sideline and watches... further discussion...] ...

teknerd · Post by **teknerd** » Fri Dec 31, 2004 1:52 pm

Sleeper wrote:teknerd, you may need to check your math.
A 29%dB reduction from 55dB is 16dB

Sleeper:
Sound measurement in dB is not linear. An increase of 10dB doubles the sound while a decrese of 10dB cuts the sound in half,

nici · Post by **nici** » Fri Dec 31, 2004 1:54 pm

Yes well, not really. Each 3dB sound pressure doubles/halves.. I wont bother countinng how many percent that is..

*lazy* Oh, Happy new year! 0:05 here.

teknerd · Post by **teknerd** » Fri Dec 31, 2004 1:57 pm

nici wrote:Yes well, not really. Each 3dB sound pressure doubles/halves.. I wont bother countinng how many percent that is.. *lazy* Oh, Happy new year! 0:05 here.

the 3dB figure is when you add a second identical noise source (ie: two identical fans), then sound pressure incrases by 3dB

peteamer · Post by **peteamer** » Fri Dec 31, 2004 1:59 pm

nici, Happy New year !!!

(Oh.... and the_scarf )

nici · Post by **nici** » Fri Dec 31, 2004 1:59 pm

Okay..

Im stuck in hi-fi here..

You know, to increase SPL 3dB you need double the power.(hurray! i know something

) Oh well, you learn something new every day

teknerd · Post by **teknerd** » Fri Dec 31, 2004 4:04 pm

I believe that still holds true in this area. However i think there is a difference between the power and the volume.

Bill Dunsmore · Post by **Bill Dunsmore** » Fri Dec 31, 2004 7:46 pm

There seems to be some confusion here. Twice the electrical power is +3 dB, half power is -3 dB. However, the human brain/ear subsystem responds logarithmically, so to takes a 10 dB increase to SOUND twice as loud, a 10 dB decrease SOUNDS half as loud. That is why two identical fans don't SOUND twice as loud as one.

nici · Post by **nici** » Fri Dec 31, 2004 8:52 pm

ok

im a bit confused here.. so it is 3dB, but the human ear doesnt understand that and it thinks its 10dB?

Yeees, maybe ill just shut up and go home.

Tephras · Post by **Tephras** » Sat Jan 01, 2005 12:33 am

No, it is not that the human ear perceives an increase of 3dB as an increase of 10dB. What Bill means is that the human ear doesn't perceive an increase of 3dB as twice as loud even though it is (in power), it's not until the sound has increased 10dB that the human ear perceives it as twice as loud.

Sleeper · Post by **Sleeper** » Tue Jan 04, 2005 7:33 pm

teknerd wrote:
Sleeper wrote:teknerd, you may need to check your math.
A 29%dB reduction from 55dB is 16dB
Sleeper:
Sound measurement in dB is not linear. An increase of 10dB doubles the sound while a decrese of 10dB cuts the sound in half,

Holy CR_P!
Man I did not mean to start something here.

I only meant to point out that the author does not compare dB to noise.
Since dB is used exclusively here, it is linear.

Peace man!

Chart · Post by **Chart** » Tue Jan 04, 2005 11:41 pm

Now the author have fixed sound reduction to 97%.

burcakb · Post by **burcakb** » Wed Jan 05, 2005 12:13 am

*sigh* http://www.blanket-insulation.com/Acous ... sound.html

So a 16 dBA reduction corresponds to more than %82 absolute reduction

overclockers.com has good article of how to tidy a case

overclockers.com has good article of how to tidy a case

Re: overclockers.com has good article of how to tidy a case

Isnt it just Math?

Re: Isnt it just Math?

3 dB versus 10 dB

Re: Isnt it just Math?

Re: Isnt it just Math?