supermicro 1280W SQ $85 + BO

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PnoT

Active Member
Mar 1, 2015
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I wonder how these compare to the PWS-920P-SQ which are supposed to be the quietest of the SM power supplies.

I don't need 1280W worth but it can't draw more than a 920P at idle can it?
Nice find!@
 
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T_Minus

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Feb 15, 2015
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I have these they are quiet, I hear the air sucking in the front over these.

BUT you are wrong sadly, 1280w does idle higher than 900 watts, and deff. more than 500 watts. The difference for you depends on your total draw at idle. The lower your idle draw the more inefficient this will be.

If you're using mostly SSD or not HDs then you really want the 500w drive or one lower, even something not platinum but quality 300w-400w will be more efficient.
 

PnoT

Active Member
Mar 1, 2015
650
162
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Texas
I have these they are quiet, I hear the air sucking in the front over these.

BUT you are wrong sadly, 1280w does idle higher than 900 watts, and deff. more than 500 watts. The difference for you depends on your total draw at idle. The lower your idle draw the more inefficient this will be.

If you're using mostly SSD or not HDs then you really want the 500w drive or one lower, even something not platinum but quality 300w-400w will be more efficient.
My SC846 has 18 drives in it now all 4-5TB spinners but I doubt the draw is that high but I haven't checked. I'm not sure how to check the consumption thou.
 

T_Minus

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Feb 15, 2015
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I don't think you'll make the $ back anytime (years) soon. Even if you got them for $50 each that's a lot of power. With likely 300w or less at idle your sysstem would have 1000w in excess :X
 

canta

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Nov 26, 2014
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easy to read on chart from SM

the sweet spot is 647W load :D

upload_2015-11-2_19-54-48.png
 

briandm81

Active Member
Aug 31, 2014
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Any idea if these are as quiet as the 920W?
I'd like to know as well. These are considerably cheaper than the 920W SQ's that are available right now and I'm pretty sure when I fire up my new SC846 I'll be ordering an SQ.
 

Aluminum

Active Member
Sep 7, 2012
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Sorry but this makes no sense:

With likely 300w or less at idle your sysstem would have 1000w in excess :X
Its over 90% efficient at 10% load, far better than typical older crap.

If your server pulls 130W it wastes a big fat 13W. A 500W platinum at 130W would be around 95% and waste 6W or so, at 10 cents/KW/h it would be ~$6/year difference in efficiency.

Unless your server is massively under-powered (way under 100W) for the big supermicro rackmount case it is in, I would not give two flips about finding a lower wattage PSU and jump on a good deal if you need one.
 

hd2012

Member
Jan 18, 2014
56
8
8
AL is right .. 1280w efficiency variation is 5%. if you were to get the 920w SQ, differential efficiency variation may be less than 2%. which means at a nominal load of 300W, you're talking 6W. who cares about power costs at this point? primary objective is audible comfort. i can't answer that as i don't own either.
 

canta

Well-Known Member
Nov 26, 2014
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If you see the chart..
Sm provide eff from 25% to up..

Below from 20% is not 90% and less than 90%.

I am talking on eff only not noise..

I would assume 920sq would more quite..

I switch to 500w platinum and save 20w on each psu..from gold 1000w.

And I have 3 machine running 24x7
 

T_Minus

Build. Break. Fix. Repeat
Feb 15, 2015
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I don't think you'll make the $ back anytime (years) soon. Even if you got them for $50 each that's a lot of power. With likely 300w or less at idle your sysstem would have 1000w in excess :X


BUT you are wrong sadly, 1280w does idle higher than 900 watts, and deff. more than 500 watts. The difference for you depends on your total draw at idle. The lower your idle draw the more inefficient this will be.
Sorry but this makes no sense:



Its over 90% efficient at 10% load, far better than typical older crap.

If your server pulls 130W it wastes a big fat 13W. A 500W platinum at 130W would be around 95% and waste 6W or so, at 10 cents/KW/h it would be ~$6/year difference in efficiency.

Unless your server is massively under-powered (way under 100W) for the big supermicro rackmount case it is in, I would not give two flips about finding a lower wattage PSU and jump on a good deal if you need one.
...Expand the above.

I highlighted in red where you said the same thing I did after arguing against my point... ?
 
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briandm81

Active Member
Aug 31, 2014
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So outside of the efficiency argument...which I don't care about at all. How much quieter is the 920W vs the 1280W? My SC846 came with the 1400W which I haven't powered on yet...but I'm virtually certain I'll need something quieter.
 

T_Minus

Build. Break. Fix. Repeat
Feb 15, 2015
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I can get you DB measurement but it will be ~ 1 week.

Either one you could work 3-4' away from IMHO.
 

sfbayzfs

Active Member
May 6, 2015
259
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SF Bay area
Make sure these are compatible with your chassis before ordering them!

I got a few from another seller for about 75 each after shipping, only to find that they only fully plug into my SC847 36-bay 4U chassis, but not sc836 or sc846 or the 2U chassis. It all depends on the power distribution backplane the PSUs connect to - the 920p-1R and -SQ PSUs all have a narrower card edge - the 1.2K 1R gold PSUs also have the narrower card edge, but these 1.2K SQs and the 1.4K 1R golds all have a wider card edge which goes to roughly 1/4 inch from the edge of the PSU vs roughly 1/2 an inch from the edge for the lower wattage PSUs.
 

canta

Well-Known Member
Nov 26, 2014
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Make sure these are compatible with your chassis before ordering them!

I got a few from another seller for about 75 each after shipping, only to find that they only fully plug into my SC847 36-bay 4U chassis, but not sc836 or sc846 or the 2U chassis. It all depends on the power distribution backplane the PSUs connect to - the 920p-1R and -SQ PSUs all have a narrower card edge - the 1.2K 1R gold PSUs also have the narrower card edge, but these 1.2K SQs and the 1.4K 1R golds all have a wider card edge which goes to roughly 1/4 inch from the edge of the PSU vs roughly 1/2 an inch from the edge for the lower wattage PSUs.
you can cut the pcb to make fit on the PS slot