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why are my fans so noisy? - Page 2

post #11 of 31
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Quote:
Originally Posted by champyg View Post
EDIT: read original post wrong. Was thinking OP said old fans were making the noise. Disregard
THIS.
my CM R4s are the problem. they were fine until i put them vertically on the door :/
i have this

sry for the confusion lol
my slipstreams are great btw! CPU temps dropped by...um 10C+ or something like that.
    
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post #12 of 31
Quote:
Originally Posted by ehume View Post
Well, at 50% it's not a 1900 rpm fan anymore. Now it's down in the range where Slip Stream excel. I would expect your results with that fan once you get under 1500 rpm.
Technically, it is still a 1900 rpm fan running at a lower speed during a specific point in time. I mentioned that my fan was quiet at 50% because the OP mentioned that he "lowered the fan speed to 40% with ASUS AI Suite but it still makes that annoying noise".
    
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post #13 of 31
Quote:
Originally Posted by listen to remix View Post
Technically, it is still a 1900 rpm fan running at a lower speed during a specific point in time. I mentioned that my fan was quiet at 50% because the OP mentioned that he "lowered the fan speed to 40% with ASUS AI Suite but it still makes that annoying noise".
Technically you're right. But when you've had in your hands and played with the entire series of them, you realize they are all the same fan, just set to run at different speeds.

I've come to the conclusion that for every blade count and blade shape there is an optimal speed. There is probably an optimal speed for motors as well, but I can't see those.

Slip Streams are lovely fans at low rpm's.
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post #14 of 31
Thread Starter 
*cough* once again, the slipstreams are not the problem! its the R4s, see bold text in OP *cough*
    
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post #15 of 31
Were the CM fans originally horizontal? As in, blowing up or blowing down.

Sleeve bearing fans are only supposed to be used in a vertical or "standing" application.

Also, on my storm scout I have two of the same fan on my side panel. They make a terrible high pitched noise cranked up, BUT so have all the fans I put there. Its not the fans making the noise for me, its the actual side panel making the noise. If I take my fans out of the panel and crank them up, they are totally silent.
Edited by Roll Cam Tide - 4/24/11 at 9:35pm
post #16 of 31
This thread reminds me of a video I took back in 2009


8x Slipstream 1900RPM doubled up on a Rheobus in a Rocketfish.
post #17 of 31
Quote:
Originally Posted by SmasherBasher View Post
This thread reminds me of a video I took back in 2009
8x Slipstream 1900RPM doubled up on a Rheobus in a Rocketfish.
Wow that was unbearable lol. That fan controller is the most valuable piece of equipment in that box.
post #18 of 31
Thread Starter 
Quote:
Originally Posted by Roll Cam Tide View Post
Were the CM fans originally horizontal? As in, blowing up or blowing down.

Sleeve bearing fans are only supposed to be used in a vertical or "standing" application.

Also, on my storm scout I have two of the same fan on my side panel. They make a terrible high pitched noise cranked up, BUT so have all the fans I put there. Its not the fans making the noise for me, its the actual side panel making the noise. If I take my fans out of the panel and crank them up, they are totally silent.
yeah the fans were originally horizontal blowing in as intake.
idk if its door but when i used my hands and covered most of the surface area of the grill the noise stopped! strange.

is it my door or my fans????
    
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post #19 of 31
Thread Starter 
also i think one of the fans is going faster and is louder than the other. its brighter than the other too.
how can i control both of them?
btw can fully control the fans thru software? that would be great till i have money to buy a fan controller.
    
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post #20 of 31
If ones brighter and faster that means its getting more voltage. May just be the connectors they are plugged into. As far as the noise, you need to take a fan out and see if the noise is there when its not in the case. If they are quiet outside the case, you have your answer. You wouldn't believe (or maybe you would lol) the difference in noise. Somehow, the air is hitting the holes in the side panel in such a way that its "howling"or something. I have a scythe fan controller and I keep them all the way down nearly all the time cuz the noise is sooo annoying.

Oh and those fans aren't made to be layed horizontal. I dont know exactly how much damage it can cause but they deliberately say to only use them vertical....
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