Go Back   Hardware Canucks > HARDWARE > Power Supplies

    
Reply
 
LinkBack Thread Tools Display Modes
  #1 (permalink)  
Old October 13, 2009, 11:50 AM
MVP
F@H
 
Join Date: May 2009
Location: Calgary, AB
Posts: 377

My System Specs

Default Power Consumption Question

If I had a 750W power supply and my system only draws around 500W, the power supply only draws the 500W from the wall, correct? It wouldn't be using 750W all the time, just 500W?
__________________

Last edited by redwagon; October 13, 2009 at 12:33 PM. Reason: Typo
Reply With Quote
  #2 (permalink)  
Old October 13, 2009, 12:04 PM
Hall Of Fame
F@H
 
Join Date: Oct 2008
Location: Ottawa
Posts: 2,026
Default

Only uses what it needs.
__________________
"What is the colour when black is burnt ?" - Neil Young
Reply With Quote
  #3 (permalink)  
Old October 13, 2009, 12:07 PM
MVP
F@H
 
Join Date: May 2009
Location: Calgary, AB
Posts: 377

My System Specs

Default

Quote:
Originally Posted by crazyhorsejohnny View Post
Only uses what it needs.
Thanks johnny! Just making sure so I won't be wasting electricity if I upgrade my power supply.
__________________
Reply With Quote
  #4 (permalink)  
Old October 13, 2009, 12:14 PM
Jake_HT's Avatar
Hall Of Fame
F@H
 
Join Date: May 2008
Location: Calgary, AB
Posts: 1,986

My System Specs

Default

Well at about 80% efficiency, if it needs 500w to the PC, it will actually be taking 600w from the wall... but yes it only uses what it needs.
__________________
http://jakeht.deviantart.com/
Reply With Quote
  #5 (permalink)  
Old October 13, 2009, 12:25 PM
bissa's Avatar
Hall Of Fame
F@H
 
Join Date: Jun 2009
Location: Kelowna BC
Posts: 1,160

My System Specs

Default

I'm pretty sure you just mean W not kW, because if a computer is using 500kW there is something VERY wrong.
it will only draw requirement/efficiency as a decimal. so if you have a low efficiency PSU like 50-60 you will be using close to twice the needed power while if you have a high efficiency PSU like 85-95 that it will only consume a small amount more than your hardware.
__________________
Strong like hummingbird, swift like oak.

I'm sorry july, I couldn't see you behind all that feruary.
Reply With Quote
  #6 (permalink)  
Old October 13, 2009, 12:34 PM
MVP
F@H
 
Join Date: May 2009
Location: Calgary, AB
Posts: 377

My System Specs

Default

Quote:
Originally Posted by bissa View Post
I'm pretty sure you just mean W not kW, because if a computer is using 500kW there is something VERY wrong.
it will only draw requirement/efficiency as a decimal. so if you have a low efficiency PSU like 50-60 you will be using close to twice the needed power while if you have a high efficiency PSU like 85-95 that it will only consume a small amount more than your hardware.
Oops, yes, meant Watts. Fixed. Thanks for the replies.
__________________
Reply With Quote
  #7 (permalink)  
Old October 13, 2009, 05:29 PM
rjbarker's Avatar
Hall Of Fame
 
Join Date: Feb 2008
Location: Courtenay, B.C
Posts: 5,932

My System Specs

Default

1kW = 1000W
1.2kW = 1200W

Amazing the PSU's that are now required in this day and age eh?!
__________________
Introducing me n my OCD to Watercooling, is like taking an Alcoholic to an "all you can drink" Beach Bar in Mexico

.
Reply With Quote
  #8 (permalink)  
Old October 18, 2009, 03:39 AM
Lima's Avatar
Allstar
 
Join Date: Feb 2008
Location: Laval, Qc
Posts: 588

My System Specs

Default

Didn't know that bit about efficiancy and how it plays a role in power consumption. But... Is that extra 100w being wasted or lost?

Thanks guys.

Last edited by Lima; October 18, 2009 at 03:44 AM.
Reply With Quote
  #9 (permalink)  
Old October 18, 2009, 05:27 AM
Gellidius's Avatar
MVP
F@H
 
Join Date: Dec 2008
Location: Quebec
Posts: 349

My System Specs

Default

the 15% lost power in a 85% efficiency PSU is dumped as heat.
__________________
Jacques


Ego cogito, ergo deus non est.
Reply With Quote
  #10 (permalink)  
Old October 18, 2009, 02:18 PM
Lima's Avatar
Allstar
 
Join Date: Feb 2008
Location: Laval, Qc
Posts: 588

My System Specs

Default

Aha! So it goes to a complete waste only half of the year.
Reply With Quote
Reply


Thread Tools
Display Modes

Similar Threads
Thread Thread Starter Forum Replies Last Post
PC Power Consumption Analysis MpG Reviews & Articles from the Web 29 June 11, 2009 04:23 PM
48xx Powerplay and idle power consumption? superj Video Cards 0 March 6, 2009 06:24 PM
Folding power consumption Alwaysrun HardwareCanucks F@H Team 10 February 23, 2009 05:15 AM
I DID IT!!!! Serious power consumption SKYMTL Power Supplies 10 February 16, 2008 06:16 PM
F@H vs. Power Consumption cujo HardwareCanucks F@H Team 14 August 8, 2007 07:32 AM