Hi,
The stock CPU cooling fan in my media server is as noisy as a jet engine. What makes the noise? Mechanical? Air whooshing through the fan or cooling fins? I can't believe such small object can make so much noise just by spinning.
Thanks, Gary
Are they old and worn out? Has the manufacturer not used the emulation of an owl's wing which has been known and used for decades?
"JeffM"
** The first hit in the above link is hysterical.Must be translated from the original Chinese by software.
Probably entirely bollocks anyway.
Note the date is April 1.
.... Phil
"Abby Brown"
** Never head a siren ??There are many similarities.
.... Phil
Trailing edge blade design. Some have little notches cut into them to quiet them down. Also, there is a minimum amount of clearance that is needed in the front of the fan. I think PC power and cooling has some info on their web site.
Cheers
Ball bearings are much noisier than sleeve bearings. They also last longer, so get used in server-class machines.
Small fans spin at much higher speeds, and also make much more noise than big slow fans. Because server machines are often made for rack mounting, they also tend to use very small fans (1" rather than 3"). They're also often more reliant onhigh airflow because the cases are packed tightly, so need more air from those fans.
Server machines tend to have noisy fans because they're not required to be quiet, being intended for operation in a dedicated machine room.
Clifford Heath.
It is actually the leading edge that matters, dingledorf.
Gratings are responsible for a lot of noise.
Also, there are SEVERAL different versions of any given form factor from ultra-silent BUT barely a woosh, to very noisy, but very high output as well.
It is all application specific.
The media server needs no hands on to operate, so put the damned thing in a closet and forget about it.
get used in server-class machines.
"media server" in a consumer class product is merely a gimmick name.
SOME do.
LINE LENGTH IN USENET IS 72 CHARACTERS, YOU IDIOT!
You are mixing form factor and prop velocity, and at a very poor juncture, since it deflates your entire incorrect argument.
When was the last time you entered "media server" in google? And to that, when did it bring up rack mounted modules? No, idiot. It brings up consumer level CRAP. Get a clue.
ONE inch fans? YOU are an IDIOT. Give us even ONE citation (link) for one inch form factor fans.
You cannot. You are an idiot. A one inch fan would be like placing an additional heat source in your system.
tightly, so need more air from those fans.
Your common sense level exposes your low IQ level.
quiet,
COMMERCIAL server fans. So, it was ALMOST the ONLY thing you have said so far that is close to being correct.
Unlike what 'operates' within your skull cavity.
It makes one think that your PC must be at least ten years old, since you have no clue about floks' homes and the MILLIONS of "media servers" in place in them.
"TheGlimmerMan" wrote in message news: snipped-for-privacy@4ax.com...
Hey - Glimmerman,
(or is it Dimmerman ?)
You need to lighten up a bit - it's only a discussion !
Link to 1" fan:
(first I found but Farnell do Micronel D241L-006GK-1 and others).
MK
Oh?
What is hysterical? If it is the English please tell me what is wrong with it?
I must say their second language skill is much better than mine. Is it better than yours, Phil?
Did you do any research at all before you dismissed it as "entirely bollocks"? Did you previously know anything about that subject at all?
You of course understand that April 1 as a day of pranks only has relevance in Western cultures and you understand that Eastern cultures are not the same thing. Therefore, can you explain comment about April 1
- or was that just a part of your ill will trying to trash something you don't understand?
On a sunny day (Thu, 13 Jan 2011 18:40:51 -0500) it happened "Abby Brown" wrote in :
Cheap mechanical sirens work the same way.
TheDimMan wrote in :
No it is not No it is not No it is not No it is not No it is not No it is not No it is not No it is not No it is not No it is not No it is not No it is not No it is not No it is not No it is not No it is not No it is not No it is not No it is not No it is not No it is not No it is not No it is not No it is not No it is not No it is not No it is not No it is not No it is not No it is not No it is not No it is not No it is not No it is not No it is not No it is not No it is not No it is not No it is not No it is not No it is not No it is not No it is not No it is not No it is not No it is not No it is not No it is not No it is not No it is not No it is not No it is not No it is not No it is not No it is not No it is not No it is not No it is not No it is not No it is not No it is not No it is not No it is not No it is not No it is not No it is not No it is not No it is not No it is not No it is not No it is not No it is not No it is not No it is not No it is not No it is not No it is not No it is not No it is not No it is not No it is not No it is not No it is not No it is not No it is not No it is not No it is not No it is not No it is not No it is not No it is not No it is not No it is not No it is not No it is not No it is not.
r, so get used in server-class machines.
big slow fans. Because server machines are often made for rack mounting, t= hey also tend to use very small fans (1" rather than 3"). =A0They're also o= ften more reliant onhigh airflow because the cases are packed tightly, so n= eed more air from those fans.
e quiet, being intended for operation in a dedicated machine room.
Sleeve fans will get noisier with age.
What do you expect. All my vacuum cleaners are noisy.
I should have measured the spl of a Gateway server I threw out. I had a transmitter unit in the Army, sounded like a vacuum cleaner. I think that when you start to exceed some threshold, the air gets stretched out too much and screams. I know some new outdoor air compression units now have the fan blades go in reverse of standard to cut down noise.
greg
A too small fan is used and in order to pump the required amount of air through the cooling fins, the air flow speed must be increased.
The power required to drive the fan is proportional to the third power of air speed, thus doubling the air speed (and hence doubling the heat removal capacity) requires 8 times the fan power.
Much of that fan power is dissipated in turbulent flow, creating a lot of noise.
Reducing the fan rotational speed by 30-50 % would significantly reduce the noise, but of course you would need a thermostat to control between half and full power, in order to avoid overheating.
Cheap mechanical sirens work by alternately blocking and opening air flow passages. Fan noise is mostly the result of differences in the velocity of the air leaving the top and bottom surfaces of the blades at the trailing edge, and can be mostly designed out for a price. The fans in the PC I am typing on now cannot be heard at all from more than about 5 feet away; they make less noise than the vibration isolated low speed HDDs. IIRC the brand is Silenex or something similar, fine German engineering, $30 each and well worth it for those of us who think that computers should be seen and not heard. If you like noise and periodic fan replacement you can get the same airflow from the $3 Chinese fans used by major computer manufacturers. If you don't like noise build your own in a Sonata case with good fans (toss the cheap fans that come with the case).
The CPU fan is harder to find in a quiet version, but if run variable speed based on CPU temperature in a case with very good airflow (all optional fans installed and filter kept clean) they will usually be quiet enough not to aggravate. A CPU fan which sounds like a jet engine is however a piece of shellac which needs to be replaced with something from a reputable manufacturer. All quality computer fans I have seen were of either German or Japanese manufacturer, advertised as being very quiet, and cost at least $20 for a size and airflow otherwise available for less than $5.
On a sunny day (14 Jan 2011 22:20:33 GMT) it happened Glen Walpert wrote in :
I am using an 'arctic cooling' CPU fan, IIRC that is Swiss made, and it has ceramic bearings. This is the third one in this server, last time I replaced the bearings only, as the new fan was not in balance :-) Took the bearings from the new fan. About 3.3 years per fan. Some newer smaller mobos that can be used for low traffic servers come fan-less.
In Usenet, yes it is.
It is also true that you are a goddamned utter retard, boy.
I think you should take your 4th grade grasp of physics and f*ck off.
No, dumbfuck. It was a few lines of facts about idiots that buy CRAP.
Then, there is that thing where you have zero grasp of physics.
Perhaps an obstruction in the airflow that makes the flow uneven across the face?
Unless the bearings are bad so the fan is rattling on its shaft or against its case, there is not much that can make noise except irregularities in the airflow.
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