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Old 1st May 2013, 11:23   #261
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well, if you hide in Bindi's cupboard, of course you can't hear it

It's not in the same room I sleep in, but it's in my "recreational" room. My computer is silent with all fans no faster than 400 RPM. Having it on or off makes no difference at all. I would like similar thing for the Microserver, at least at the 3 to 4 meters distance between where I sit and it.
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Old 1st May 2013, 11:40   #262
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Oh - if it's any help, I found this: http://homeservershow.com/hp-prolian...revisited.html
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Old 1st May 2013, 11:42   #263
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Originally Posted by wuyanxu View Post
Just wondering any good fan recommendations, I've done my research and ordered the fan model mentioned by the SilentPC review. BUT I received Email today saying it's discontinued and they are not able to get more in.
I personally used the Enermax Cluster while i had my Microserver, but only because i had few of them at home . Considering the thermals of the case, any slow (but higher than 500RPM) 3-pin fan will do, the case is relatively open and the CPU doesn't make much heat either.
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Old 1st May 2013, 13:16   #264
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Think I'm going to go with fixed fan speed version as SilentPC review mentioned, PWM fans behave quite differently depending on the fan being used, so I don't want to risk it dropping below 500RPM.

I've looked around, this one seems nice: "Scythe Glide Stream 800RPM 120mm"? 40 odd CFM airflow, 14 dBa noise and 800 RPM at 12v, just plug and play.
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Old 16th May 2013, 08:46   #265
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120mm fan replaced, slightly quieter than before. But it's still louder than I wanted, I'm looking at the PSU now.

Anyone done the PicoPSU mod to it?
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Old 16th May 2013, 08:50   #266
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Quote:
Originally Posted by wuyanxu View Post
120mm fan replaced, slightly quieter than before. But it's still louder than I wanted, I'm looking at the PSU now.

Anyone done the PicoPSU mod to it?
Info

"Replacement Power Supply - PicoPSU

HP claim a maximum of 24dBA for the Microserver, which should be relatively quiet. However, mine is a lot louder than this and several others on the internet claim the same. A lot of this noise comes from the power supply fan. I've got the N40L version of the Microserver, which is an upgrade over the original. It's possible that HP switched the power supply to a noisier model with this version but have kept the low-noise claims from the original. Either way, even 24dBA would be too loud - I want this thing to sit in my dining room!

Mini-Box.com make a tiny, fanless power supply: the PicoPSU. This is a DC-DC power supply so has an external AC-DC adapter, like a laptop charger. I had a spare of the 120W version so have used this - 120W is fine for my needs, but probably wouldn't work if I was using four HDDs as the power-on spike as they all spun up would likely be too much. The PicoPSU fits into the Microserver's ATX connector beneath the drive bays with about 2mm to spare! With this installed along with the new fan, the server is silent!

In order to properly fit the PicoPSU, a little bit more tweaking is needed. The power cables that come with it will not reach the disks and the 12V input cable from the external AC-DC adapter won't reach the outside of the case. This is easily fixed using a few extension cables. To take the power from the PicoPSU to the disks, I used a 30cm Molex extension cable (Akasa AK-CBPW02-30). I then used a Molex splitter cable to connect this to my SSD and HDD - you'll need more splitters if you want to use more HDDs. For the SSD, I also needed a Molex to SATA power apapter cable.

To run the PicoPSU's 12V input cable to the outside of the case, I used a 30cm, 4 pin 12V ATX power extension cable. The existing cable on the PicoPSU simply unclips into two parts and you can then fit the extension cable in between. I drilled a hole in a spare PCI-E blanking plate and fitted the AC-DC barrel connector to this. This gives a very neat external finish whilst leaving the entire fit reversible if necessary. However, you can just as easily feed the cable through the Microserver's flip-down expansion cover on the back - the cables will be slightly messier, but they are out of site at the back of the server anyway.

All of these cables are available easily and cheaply on the internet."
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Old 16th May 2013, 09:12   #267
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Thanks Parge. But has anyone done it with 5 HDD's running?

A 150w picoPSU with power brick (power brick of unknown quality mind you) costs £90. Considering the box only costed £100, that's a huge investment with possible HDD problems down the line if the power brick isn't stable.

So what I'm really asking is where to source a good quality 12v 150w power supply? and will it be enough for 5 HDD's?
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Old 16th May 2013, 09:14   #268
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Would love to put a PicoPSU into mine but it wouldn't survive 6 HDDs spinning up!

Looking to mod the PSU to take a side mounted 80mm fan when the warranty is up in October.
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Old 16th May 2013, 10:42   #269
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The sideways mount is a good idea in theory, but there is really no space for it, it's right up against the HDD cage.

Another idea is to invest in another PSU, they are FlexATX sized. but that still begs the question how loud is it going to be with the same sized 40mm fan.

PicoPSU is guaranteed to be silent, but the quality of those AC-DC bricks are questionable with such a small number of selections and no tested reviews for them.



I think I'm going to wait until the warranty is up before doing anything else. For the record, I don't recommend changing the fan, as the main source of the noise is from the tiny PSU fan.
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Old 16th May 2013, 11:24   #270
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Quote:
Originally Posted by wuyanxu View Post
I think I'm going to wait until the warranty is up before doing anything else. For the record, I don't recommend changing the fan, as the main source of the noise is from the tiny PSU fan.
I had the same issue with an old shuttle PC.

How about opening up the PSU and changing the fan in that?
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Old 16th May 2013, 12:07   #271
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I had the same issue with an old shuttle PC.

How about opening up the PSU and changing the fan in that?
at 40mm, most fans are rated at similar noise level of 25-30dB. I did have a look at a few 20mm thick fans.


Another way is to buy 250 or 270w FlexATX power supplies and like my 850w in my main machine, over spec it so it runs at around 30% load, getting the fan to spin lower. But that's also an unknown since there isn't much FlexATX power supply or its reviews.
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Old 16th May 2013, 13:07   #272
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Old 16th May 2013, 13:15   #273
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That's a 10mm fan at 4.83 CFM.

HP microserver needs a 20mm fan (for more static pressure I presume) at 8 CFM.

http://www.avforums.com/forums/16626898-post686.html
Quote:
I've now whipped out my PSU and discovered the fan is a T&T 4020HH12S-ND1, which - according to this data sheet (PDF) - means it's a DC fan, 40(w)x40(h)x20(d), HH (super high speed 7000 RPM), 12V, S (sleeve bearing), with protection device (whatever that is), Normal function (no special options) and no special electrical options. It's rated at 8.36 CFM and 31.9dBA
Any high quality 40x40x20mm fans that can do 8 CFM at lower than 20 dBA?
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Old 16th May 2013, 13:32   #274
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There is a huge difference between "uses" and "needs".
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Old 16th May 2013, 15:07   #275
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What would be the minimal airflow needed to keep the PSU cool?
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Old 16th May 2013, 15:22   #276
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Quote:
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What would be the minimal airflow needed to keep the PSU cool?
Well, according to post the original fan is :
Quote:
So, given the original fan specs rated at 12 volts, assuming straight-line performance over 5V-to-12V*, the original fan may have been running at about 2900 RPM, pushing just under 3.5CFM at 13.3dBA.
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Old 16th May 2013, 15:53   #277
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hum, 13 dBA shouldn't even be audible. But as he said, it's assuming linear performance.

If it only requires 3.5 CFM, then the Noctua with their in-line resistor will work well. Many thanks!
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Old 16th May 2013, 16:13   #278
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Well, in worst case scenario you will put the original fan back. Maybe monitor the power supply temperature using a probe for a while ?
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