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quiet SSI Power supply

D

DeFex

[H]ard|DCer of the Month - June 2011
Joined
Feb 13, 2001
Messages
5,248
I am looking for a power supply that is quiet for a dual xeon machine to be used for music production. the CPUs will be water cooled so no noise prob there but power supply has to be pretty strong, and i think a quiet one may be hard to find.

btw "quiet" means "barely audiable", not " slightly less noisy than a delta fan"
 
antec true power 550 EPS

take note the EPS version is the one with the 24pin SSI power header you need

running a couple with my tyan boards

very very quiet
and can also manage the other case fans in the system
 
unfortunately none of those fanless ones are SSI (24 pin +8 pin connector rather than 20 +4) and one is made by thermaltake which means it probably would fry your system, burn down your house, and trigger a continent wide blackout which causes a depression leading to nuclear war killing 5 billion people(not reccomended)

a water cooled one would be ideal if such a thing exist in SSI flavor. otherwisw the antec sounds good, thanks.
 
Id recommend a little case modding with a quite fan rerplacement push pull setup and a dedicated cool air duct (see cut and paste below)
Id get a supply you know will do the job, then mod to get it as quite as you need


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here is a great thread about ducting for a PSU
> http://forums.silentpcreview.com/viewtopic.php?t=8450
and some thermodynamics\aerodynamics infor
Ice Czar said:
Lee Garbutt did a push>pull fan mod on a Turbo Cool 425
http://www.leesspace.com/quiet_psu.htm
and this thread at spcr can give you lots of ideas about ducting (again)

but do to the design of the heatsinks and the density of the component package
as mentioned above, I wouldnt do the top fan mod on a Turbo Cool

boning up on Fans might be helpful as well
its not just the airflow that is important, but the static pressure
a supply with a greater resistance will benefit from a higher static pressure

a few links :p

Air Flow Vs. Pressure Characteristics
Parallel & Series Operation
Stall of Axial Flow Fans

Basic Fan Laws
How to measure Airflow vs Pressure
How to Achieve Low Noise
Accoustic Noise
EMI
Introduction: Forced Convection Cooling
How to select the right fan or blower
Step 1: The Total Cooling Requirements
Step 2: Total System Resistance / System Characteristic Curve
Step 3: System Operating Point
Click to expand...

here are three basic components to any thermal solution:
the heat transfer interface
(in this case the heatsinks total area)

the heat transfer medium's volume\pressure to time
(in this case airflow, with additional variables like airflow resistance)

and the temperature differential
(where using cooler air has a huge impact)
while the efficiency of a given supply at a given load will determine the high side of a temperature differential, by employing a cooler airstream you have the option to lower the lower side of the differential

a real good computer oriented guide to thermodynamics
General Heat Transfer Guide

Heat transfer is all about temperature differentials. Conduction through materials and convection away from surfaces is proportional to the temperature differential that exists. Basically the thermal resistance of a given solution changes with the temperature differential, which is why thermal solutions are rated in °C/W which leaves that variable ambient open but gives you a formula

The heat transfer through the wall follows a simple equation:
Q=k/L(T1-T2)


We can draw some interesting conclusions from this equation. First, heat transfer is proportional to the temperature difference on the object. If the temperature differential doubles, the heat transferred doubles. Second, the conduction coefficient "k" is proportional to heat transfer. If the conduction coefficient doubles, the heat transfer doubles Alternatively, for the same differential temperature, twice as much heat may be transferred. The final observation is "L". As thickness increases, heat transfer decreases. Alternatively, to maintain the same heat transfer through a material twice as thick requires twice the temperature differential.
Click to expand...

while that addresses conductance, there is a corrallary for convection (transfer from the heatsink to a fluid (air\water\ect)
its known as Newton's Law of Cooling

your pretty much stuck with the heatsink a supply has, but altering the airflow isnt the only tool left to you
a few simple mods and that supply will increase its range, edit > or you can use less airflow and thus quiter fans for the same capacity\temperature
the main objective being not to draw the hot air from the heatsink through the supply and getting it its own cool airstream, you do of course still need to exhaust the case ;)


I would mention that its only under truely adverse conmditions youd likely have a problem, and that, any alterations you do to the case could be likely used for the next upgrade and are infrastructure investments of both time and $$$
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limiting youself to just the PSU as a solution, is quite a constraint, whereas if you intergarte the solution throughout the case, you could employ a whoppin big but quite 120mm fan and a duct

I have basically that setup with my PCP&C 510, only its not a "quite" 120, its actually one of 3 roaring 120s in the midcase hotswap position of a 4U rackmount
 
this is good info Ice Czar i will probably be adapting this system into a now unused Al/steel 4u rack case same as this one.

5.jpg


ther is an almost completely unmodded version of the same case below it.they are both on drawer slides and isolation dampers. the system in the second case is becoming a file server in the basement (normal case) anyhow i thing it shouldnt be too much trouble to make a duct for it i have done enought with this one :)

putting a dual xeon in it may be a bit of a squeeze but NCCH-DL is atx size, the rest of it will be water cooled (2x CPU and VID)
 
Nice job on that 4U ;)

you like your RD2 Pro?
Ive had mine for about 2 years now.
 
well spotted!

heh thanks. i like the RD2 pro esp when testing audio production PC normally i bring it with me to troubleshoot studio PCs that are using older motherboards and showing them why they need to get an upgrade. nothing like "oh my super disc system and why arent i able to play so many tracks since i implimented "promise" raid" ..you can actually PROVE it to them with the PCI bandwith meter. and make a sale.
 
LOL
well if you have one they are easy to spot
damn nice displays on those things, makes everything else seem weak
they are very handy, though over time Ive come to dislike the port & button layout
doesnt seem all that well thought out

Ive never actually hooked up that firewire port
only place that might be useful would be the rig in my sig
and it only has one 32bit33MHz slot :p
besides like you I use it more as an analyzer and post card
 
how noisy is the pc power and cooling 510? to me it follows a lot of things i believe in (if they are true in this case) for audio equipment. stady stable power seems good to me and it would be worthwhile to me to use one of those PSU if i could silence it a bit. apparently it is a bit loud. but since it has a "straight through" airflow design i may be able to do a few things to quiet it a bit. (duct from outside case and slightly quieter fan)

noone ever seems to say much bad about that PSU but i have heard people say it is quiet and others say it is loud.

for ice Czar: when i got this thing i had to special order it from korea or something there were 0 reviews on google. now there are quite a few :) soon it will be obsolete unless they can make one that monitors chipsets directly (c2c protocol, lots of mobos have it) and not just the "pci bus" but for what i use it for (luddites) it will last a while :)
 
LOL luddites :p

sound is such a subjective thing when it comes to an individual
I dont have a db to give you

but If I wanted to actually silence it, and I had a Rackmount to work with
It wouldnt be all that hard to settup a baffle system both in front and hanging out the back
so there is no direct path for a sound wave of course the baffles would be sound abosorbant

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