Bitcoin Forum
December 15, 2017, 09:12:01 AM *
News: Latest stable version of Bitcoin Core: 0.15.1  [Torrent].
 
   Home   Help Search Donate Login Register  
Pages: [1] 2 »  All
  Print  
Author Topic: Maximum output I can use from a power supply?  (Read 1656 times)
dunand
Hero Member
*****
Offline Offline

Activity: 642



View Profile
October 22, 2012, 05:57:17 PM
 #1

I have this power supply : OCZ Z series gold 850w


Can I really use the full 850 watts from the 12 volts continuously or I'm asking for trouble?

What is the maximum power I should use if I want to be on the safe side and lowering the chance of breaking it?
1513329121
Hero Member
*
Offline Offline

Posts: 1513329121

View Profile Personal Message (Offline)

Ignore
1513329121
Reply with quote  #2

1513329121
Report to moderator
Advertised sites are not endorsed by the Bitcoin Forum. They may be unsafe, untrustworthy, or illegal in your jurisdiction. Advertise here.
1513329121
Hero Member
*
Offline Offline

Posts: 1513329121

View Profile Personal Message (Offline)

Ignore
1513329121
Reply with quote  #2

1513329121
Report to moderator
1513329121
Hero Member
*
Offline Offline

Posts: 1513329121

View Profile Personal Message (Offline)

Ignore
1513329121
Reply with quote  #2

1513329121
Report to moderator
crazyates
Legendary
*
Offline Offline

Activity: 952



View Profile
October 22, 2012, 06:11:45 PM
 #2

Typically, 80-90% of max is recommended for 24/7 usage. I go by the rule of thumb that you take the PSU's efficiency into account. For an 80Plus PSU that's only 80% efficient, I'd say 80% of it's max load. For your 80Plus Gold, which should be 90% efficient, I'd say you can go to 90% of the max load.

Brand also comes into account, but I think those OCZ ones are good.

Tips? 1crazy8pMqgwJ7tX7ZPZmyPwFbc6xZKM9
Previous Trade History - Sale Thread
exotime
Newbie
*
Offline Offline

Activity: 28


View Profile
October 22, 2012, 08:02:02 PM
 #3

I've heard 85% is a safe number for 24/7. Just make sure it stays cooled, or it's going to blow.

1ExotimeUMZ4xvGXQdT2zVNACtzGZt
ElectricMucus
Legendary
*
Offline Offline

Activity: 1596


God of the code.


View Profile WWW
October 22, 2012, 08:11:06 PM
 #4

Power ratings usually come from the available heat dissipation from the switching regulator heatsinks. But that is usually not the problem if the environment stays cool.
The problem are the quality of the built-in fans which are, in almost any case crap.

Ironically if you want to go for reliability it is best to buy a "silent" power supply because those have good fans without you changing the fan and loosing the warranty.
A failure doesn't require the fan to fully fail, just a hickup and under full load the thing will be toast.
crazyates
Legendary
*
Offline Offline

Activity: 952



View Profile
October 23, 2012, 12:59:11 AM
 #5

Power ratings usually come from the available heat dissipation from the switching regulator heatsinks. But that is usually not the problem if the environment stays cool.
The problem are the quality of the built-in fans which are, in almost any case crap.

Ironically if you want to go for reliability it is best to buy a "silent" power supply because those have good fans without you changing the fan and loosing the warranty.
A failure doesn't require the fan to fully fail, just a hickup and under full load the thing will be toast.

That's why I said efficiency is a key factor in determining how high you can run a PSU. The difference in a 1200W PSU between 80% efficient and 90% efficient is > 100W. That's a lot of extra heat inside a PSU. When dealing with a 850W unit (like the OP has) thats 90% efficient (Gold) vs one that's 85% efficient (Bronze), the difference is still 40W. Having the PSU output that extra 50% more heat makes a difference in how much you can run off this 24/7.

Tips? 1crazy8pMqgwJ7tX7ZPZmyPwFbc6xZKM9
Previous Trade History - Sale Thread
goxed
Legendary
*
Offline Offline

Activity: 1708


Mining hardware dev and reviewer.


View Profile
October 23, 2012, 03:26:56 AM
 #6

I have this power supply : OCZ Z series gold 850w


Can I really use the full 850 watts from the 12 volts continuously or I'm asking for trouble?

What is the maximum power I should use if I want to be on the safe side and lowering the chance of breaking it?

It's 80Plus Gold, it's 88% efficient @ 100% load. So it will dissipate 116Watts at max load. It's almost as much a vanilla 80Plus 650W PSU.
Make sure the PSU is well vented at max load, and use a P3 Killawatt to meter the input load, and never exceed 966Watts.

Looking to review Bitcoin / Crypto mining Hardware.
Unacceptable
Legendary
*
Offline Offline

Activity: 2212



View Profile
October 23, 2012, 03:35:15 AM
 #7

I personally like to keep a 25% margin or 200 watts.

Seems to work,cause when I don't,it bites me in the butt  Embarrassed

"If you run into an asshole in the morning, you ran into an asshole. If you run into assholes all day long, you are the asshole."  -Raylan Givens
Got GOXXED ?? https://www.youtube.com/watch?v=9KiqRpPiJAU&feature=youtu.be
"An ASIC being late is perfectly normal, predictable, and legal..."Hashfast & BFL slogan Smiley
muqali
Full Member
***
Offline Offline

Activity: 182


View Profile
October 23, 2012, 04:14:26 AM
 #8

Like others have said, if you're looking at anything over 750 watts constantly, upgrade. Go 1200W then you don't need to worry for a while. Only time I'd run at 850 is if I had ordered the other stuff and it was on the way.

donations BTC: 1CaCwo4xneTqTLEdomW76Cg5NteZyvXi1c
donations LTC: LTcasvjtLuN92ks1Pc1qtkvE9PswsXEbev
crazyates
Legendary
*
Offline Offline

Activity: 952



View Profile
October 23, 2012, 06:02:43 AM
 #9

I have this power supply : OCZ Z series gold 850w


Can I really use the full 850 watts from the 12 volts continuously or I'm asking for trouble?

What is the maximum power I should use if I want to be on the safe side and lowering the chance of breaking it?

It's 80Plus Gold, it's 88% efficient @ 100% load. So it will dissipate 116Watts at max load. It's almost as much a vanilla 80Plus 650W PSU.
Make sure the PSU is well vented at max load, and use a P3 Killawatt to meter the input load, and never exceed 966Watts.

Really? Yes, a 850W PSU that's 88% efficient will pull 966W from the wall at 100%, but he's asking what % he can run at for 24/7 use. You're not going to run ur PSU at 100% for very long. If you're using a kill-a-watt, try to keep the at-the-wall readings below the rated max, in this case 850W.

Tips? 1crazy8pMqgwJ7tX7ZPZmyPwFbc6xZKM9
Previous Trade History - Sale Thread
muqali
Full Member
***
Offline Offline

Activity: 182


View Profile
October 23, 2012, 03:32:23 PM
 #10

I have this power supply : OCZ Z series gold 850w

Can I really use the full 850 watts from the 12 volts continuously or I'm asking for trouble?

What is the maximum power I should use if I want to be on the safe side and lowering the chance of breaking it?

It's 80Plus Gold, it's 88% efficient @ 100% load. So it will dissipate 116Watts at max load. It's almost as much a vanilla 80Plus 650W PSU.
Make sure the PSU is well vented at max load, and use a P3 Killawatt to meter the input load, and never exceed 966Watts.

Really? Yes, a 850W PSU that's 88% efficient will pull 966W from the wall at 100%, but he's asking what % he can run at for 24/7 use. You're not going to run ur PSU at 100% for very long. If you're using a kill-a-watt, try to keep the at-the-wall readings below the rated max, in this case 850W.

Some of the PSU reviewers have torture tests, where they put their PSU's in an oven at 50C or some such and load them at 100% for hours. It can be done, but Murphy's law will likely kick your ass. You'd get away with it just "benchmarking", soon as you tried to do something you really needed or wanted to do, it'd cough sparks an hour in.

donations BTC: 1CaCwo4xneTqTLEdomW76Cg5NteZyvXi1c
donations LTC: LTcasvjtLuN92ks1Pc1qtkvE9PswsXEbev
AndrewBUD
Hero Member
*****
Offline Offline

Activity: 560


View Profile
October 23, 2012, 03:34:30 PM
 #11

Depends on the PSU and your rig setup..


I managed to mine successfully with 4 5800 series cards on a Antec 620watt PSU.


be careful with PSU's with multiple 12volt rails..

POPULTRADE| Create, join, or invest in any business
ICO | ANN  ❘|❘  ICO starts 11. December
dunand
Hero Member
*****
Offline Offline

Activity: 642



View Profile
October 24, 2012, 12:58:20 AM
 #12

Thanks all for your input. I will use my killawatt and try to stay below 80% of the maximum output.
hardcore-fs
Full Member
***
Offline Offline

Activity: 196


View Profile WWW
October 24, 2012, 03:35:09 AM
 #13

Double it!!!!
I.E stay BELOW 50% and have a happy life.


1. Every 10 degrees above 25 degree cent  HALFS the life of electronics.
2. Some days are hotter.
3. Sometimes the device will issue a sudden peak demand on the PSU, the closer you run to the maximum rating the more negative the effect on the internal semiconductors. (ripple increases the more you load towards the max)
4. it is a switched mode power supply, they automatically adjust for the power output required, it is not an iron cored transformer power sucker.

HC


BTC:1PCTzvkZUFuUF7DA6aMEVjBUUp35wN5JtF
AndrewBUD
Hero Member
*****
Offline Offline

Activity: 560


View Profile
October 24, 2012, 06:25:26 PM
 #14

so you will buy a 1200watt PSU instead of a 750watt for fun?  Mining rigs usually only consist of GPU's and a hard drive.

a quality 750watt PSU with 60+ amps on a single 12volt rail will go a long way when you're only running GPU's.


I thought we were here to make money. Smiley

POPULTRADE| Create, join, or invest in any business
ICO | ANN  ❘|❘  ICO starts 11. December
jjiimm_64
Legendary
*
Offline Offline

Activity: 1862


View Profile
October 24, 2012, 09:55:29 PM
 #15

so you will buy a 1200watt PSU instead of a 750watt for fun?  Mining rigs usually only consist of GPU's and a hard drive.

a quality 750watt PSU with 60+ amps on a single 12volt rail will go a long way when you're only running GPU's.


I thought we were here to make money. Smiley

Try to run 5 x 7970's...  i use 2 SeaSonic 750's on one rig. 

Althouth, haveing them clocked at   930/780/0.937, they only pull about 850w at the wall.

1jimbitm6hAKTjKX4qurCNQubbnk2YsFw
AndrewBUD
Hero Member
*****
Offline Offline

Activity: 560


View Profile
October 24, 2012, 10:03:06 PM
 #16

Well you could get away with a quality 850watter with a max output of 900+ watts.


Quality PSU's are underrated and usually have a higher max output on the 12volt rail.



POPULTRADE| Create, join, or invest in any business
ICO | ANN  ❘|❘  ICO starts 11. December
ssateneth
Legendary
*
Offline Offline

Activity: 1302



View Profile
October 24, 2012, 10:05:19 PM
 #17

Powering TEN GPU's plus a motherboard/cpu/ram/hard drivefrom a rosewill 1300W lightning all day long, and 6 from a 750W NZXT HALE90. Pretty much all my power supplies are maxxed and are trucking along all day long.

jjiimm_64
Legendary
*
Offline Offline

Activity: 1862


View Profile
October 24, 2012, 10:15:16 PM
 #18

Well you could get away with a quality 850watter with a max output of 900+ watts.


Quality PSU's are underrated and usually have a higher max output on the 12volt rail.




I agree i underuse my SeaSonics.  I started getting the 650's, cause at least they still have 2 sets of pci wires.. i HATE molex adapters

1jimbitm6hAKTjKX4qurCNQubbnk2YsFw
AndrewBUD
Hero Member
*****
Offline Offline

Activity: 560


View Profile
October 24, 2012, 10:22:24 PM
 #19

Well you could get away with a quality 850watter with a max output of 900+ watts.


Quality PSU's are underrated and usually have a higher max output on the 12volt rail.




I agree i underuse my SeaSonics.  I started getting the 650's, cause at least they still have 2 sets of pci wires.. i HATE molex adapters

Me too. I don't mind the single plug ones you get with some of the 7900 series cards, nice and long with a single plug Smiley

POPULTRADE| Create, join, or invest in any business
ICO | ANN  ❘|❘  ICO starts 11. December
crazyates
Legendary
*
Offline Offline

Activity: 952



View Profile
October 25, 2012, 09:21:42 PM
 #20

nice and long with a single plug Smiley
http://www.urbandictionary.com/define.php?term=twss

Tips? 1crazy8pMqgwJ7tX7ZPZmyPwFbc6xZKM9
Previous Trade History - Sale Thread
Pages: [1] 2 »  All
  Print  
 
Jump to:  

Sponsored by , a Bitcoin-accepting VPN.
Powered by MySQL Powered by PHP Powered by SMF 1.1.19 | SMF © 2006-2009, Simple Machines Valid XHTML 1.0! Valid CSS!