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Power supply and wattage

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January 16, 2013 1:13:20 PM

Building a NAS / server having problems picking out the PSU, using a regular mobo and CPU (I7 950) (mobo's not sever specific) putting everything in a tower, Antec P280

These are the drives that I want to use. probably going to go with between 6 and 8 of them depending if I go with the 2 or 3TB version drives
http://www.newegg.com/Product/Product.aspx?Item=N82E168... ------WD RED

Can anyone tell me what size of PSU i should get and if I can get a regular PSU or do I have to get one that is made for a server or NAS system

I'd appreciate any help I can get thank you

More about : power supply wattage

a b ) Power supply
a b G Storage
January 16, 2013 1:32:17 PM

If this is for NAS use, then plan on:

0.6A x 5V + 0.45A x 12V = 8.4 Watts per WD RED Drive (max), so for 8, rounds up to 70 watts (actual consumption numbers taken directly from WD RED Drive casing).

250 Watts (max) for your board+CPU (100% CPU load, board losses, various onboard devices and powered ports).

50-150 Watts (typical) for your GPU (not sure what you are going to use, if you use one at all, something low powered is preferable)

Total so far:

70+250+(0,150) = 320 to 470 Watts (max) for main components, minimum load probably about 50 to 100 watts.

If you want to size your PSU given today's PSU efficiency curves, I would aim for about 500 Watts, so your minimum load is about 10% to 20% of PSU's max output, and max is ~90%, so most of the time, your NAS is operating in a very efficient % zone of your PSU's max output.

Seeing as how this is a NAS, you can and likely will be able to get away with a lower wattage power supply, since the CPU is not expected to get 100% load (you can even specify this in Windows Server, or whatever you use, to explicitly NOT load the CPU to 100%, any core), and the GPU is not expecting load (if you go with a headed NAS).
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a b G Storage
January 18, 2013 7:07:13 PM

Terry99 said:
Building a NAS / server having problems picking out the PSU, using a regular mobo and CPU (I7 950) (mobo's not sever specific) putting everything in a tower, Antec P280

These are the drives that I want to use. probably going to go with between 6 and 8 of them depending if I go with the 2 or 3TB version drives
http://www.newegg.com/Product/Product.aspx?Item=N82E168... ------WD RED

Can anyone tell me what size of PSU i should get and if I can get a regular PSU or do I have to get one that is made for a server or NAS system

I'd appreciate any help I can get thank you



For NAS you don't need i7, i5 or even i3... these are over kill and cost energy for nothing.
Atom or AMD E-350 is plenty good...
Just make sure the storage have plenty Random read/write - you are good to go.

I built 40TB NAS consumption only 180W and transfer 94MB/s in 1x GbE and over 200MB/s in bonding 2x GbE
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a b ) Power supply
a b G Storage
January 19, 2013 12:37:02 PM

FireWire2 said:
For NAS you don't need i7, i5 or even i3... these are over kill and cost energy for nothing.
Atom or AMD E-350 is plenty good...
Just make sure the storage have plenty Random read/write - you are good to go.

I built 40TB NAS consumption only 180W and transfer 94MB/s in 1x GbE and over 200MB/s in bonding 2x GbE


I have a feeling that the OP is trying to reuse/recycle some parts from an existing rig...
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a b G Storage
January 26, 2013 4:41:37 PM

Maxx_Power said:
I have a feeling that the OP is trying to reuse/recycle some parts from an existing rig...


You may be right about that, but in the long run, low power system will save lots of $$$ :-)
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