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Low noise solution for mirrored G4's coming
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Addicted to MacNN
Join Date: Apr 2001
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Nasrudin sat on a river bank when someone shouted to him from the opposite side: "Hey! how do I get across?" "You are across!" Nasrudin shouted back.
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Senior User
Join Date: Sep 2000
Location: Torrance, CA
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Looks nice but isn't the bulk of the noise coming from the Power Supply? My 120MM fan kicks in occasionally but not a lot, it's the constant "whine" from the power supply fans that I hear all the time.
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Mac Elite
Join Date: Mar 2000
Location: Cambridge
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Verax replaced the 60 mm fans on the PSU with 65 mm fans if their own design. Total noise output from a modified MDD is said to be around 20 dB. Wow.
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Dedicated MacNNer
Join Date: Feb 2003
Location: Olympia, WA
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What's the output on an ummodded MDD?
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Senior User
Join Date: Sep 2000
Location: Torrance, CA
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I think it's around 65db or something. There was a movie posted comparing the new FW 800 MDDs to a Sawtooth and the amount of "air" noise was less on the MDD. But the frequency was louder which is where the noise is coming from. You can to g4noise.com and read up on the whole issue. If they did manage to get it to 20 that's pretty good.
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Senior User
Join Date: Sep 2002
Location: Canastota, New York
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Originally posted by TimmyDee51:
Verax replaced the 60 mm fans on the PSU with 65 mm fans if their own design. Total noise output from a modified MDD is said to be around 20 dB. Wow.
I believe the noise is 20 db LOWER than the stock PSU.... which would be 40-something decibels.
http://www.g4noise.com/mods/Verax_REAL/index.htm
20 db total noise is unrealistic for a PSU. The quietest I've seen are high 20's to low 30's
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Mac Elite
Join Date: Jan 2001
Location: L.A., CA
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Well it's odd that they focus on the large 120mm fan more than the PS fans. Going from a larger fan to a smaller one is also an odd move to lower noise! Hmmm...
And making the CPU fan housing out of copper would be tastier. 
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Fresh-Faced Recruit
Join Date: Oct 2001
Location: sweden
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They only talk about a new quiet solution for the dual processor mdd. What about the single 1 GHz G4? It also needs to be a lot more quiet.
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Join Date: Apr 2001
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Originally posted by galarneau:
I believe the noise is 20 db LOWER than the stock PSU.... which would be 40-something decibels.
On their products page they state that PCs with their fans have been measured at 20 db.
I wonder why Apple puts no effort in making silent Macs any more. 
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Nasrudin sat on a river bank when someone shouted to him from the opposite side: "Hey! how do I get across?" "You are across!" Nasrudin shouted back.
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Dedicated MacNNer
Join Date: Mar 2001
Location: Iowa City, IA
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Originally posted by JB72:
Going from a larger fan to a smaller one is also an odd move to lower noise!
Not really. Large fans don't have to spin as fast to move the same amount of air, and a lot of the noise problem has as much to do with the frequency of hte noise as with the amplitude: 40dB at 200Hz is much more tolerable than 40dB at 4000Hz - most people are more comfortable with a purr than with a whine.
Also, the PSU fans in the rev 1 MDDs could apparently touch the case, causing a really unpleasant buzz.
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James
"I grew up. Then I got better." - Sea Wasp
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Mac Elite
Join Date: Apr 2002
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Apparantly, Verax is showing one of these silent PowerMacs at CeBit and given that I'm going to Hannover this weekend, I'll try to gather some additional information about it.
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"Life is not a journey to the grave with the intention of arriving safely in one
pretty and well preserved piece, but to skid across the line broadside,
thoroughly used up, worn out, leaking oil, shouting GERONIMO!"
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Mac Elite
Join Date: Jan 2001
Location: L.A., CA
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Originally posted by Amorph:
Not really. Large fans don't have to spin as fast to move the same amount of air, and a lot of the noise problem has as much to do with the frequency of hte noise as with the amplitude: 40dB at 200Hz is much more tolerable than 40dB at 4000Hz - most people are more comfortable with a purr than with a whine.
That's exactly my point.
Going from a larger fan to a smaller one is also an odd move to lower noise!
As you pointed out, the noise generated by a slower frequency yet larger fan is generally more tolerable. Thus, odd choice to replace a larger fan with a smaller one (as they seem to have done with the 120mm: "Replacement of the 120 mm fan with an 80 mm Verax fan") when the object is noise "reduction."
Also, the PSU fans in the rev 1 MDDs could apparently touch the case, causing a really unpleasant buzz.
True. I plan on using dual sided tape or thin rubber "fabric" to cushion the vibration between the PS (and fans) and the case. Also a good idea for the drive bracket, as they are mounted in a simlar fashion that may allow for some vibration.
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Senior User
Join Date: Nov 2000
Location: New Orleans, LA
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will this kit be quieter than the new MDD G4's or just the older ones?
I'm getting the new psu fan and case fan replacement kit from apple, so I'm wondering if it's worth it to get this other kit.
Will it be *that* much quieter?
-vasu
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