It is currently Sun Dec 21, 2014 8:35 pm

All times are UTC - 8 hours




Post new topic Reply to topic  [ 5 posts ] 

Do you actively use wake-on features?
Yes 63%  63%  [ 5 ]
No 38%  38%  [ 3 ]
Total votes : 8
Author Message
 Post subject: +5VSB: a waste of power?
PostPosted: Thu Dec 20, 2012 1:58 am 
Offline

Joined: Mon Mar 17, 2008 1:49 pm
Posts: 1256
Location: UK
I've recently got hold (for free!) of an old system from a friend based on an AS-Rock K7NF2 motherboard. On it it has a jumper called PS2_USB_PW1. I've never noticed one of these before but from what I've read it controls whether or not +5VSB is used to power devices while the system is in soft off. This can be used for things like Wake-on LAN which I never use.

Soft off power consumption has often been mentioned here before and measuring this system came to 7W. Disabling this jumper brought the number down to 6W. The margin of error may be +/-1W but I have repeated these measurements several times switching the jumper back and forth and it is quite consistent, I can say that using +5VSB to power devices while the system is off wastes power.

Now, assuming that other motherboards may have such a jumper setting, is it worth comparing the effects of this on different boards? Imagine how many systems this effects across the world and the potential power savings add up! Maybe I have solved the impending energy crisis. :lol:

I am going to check other systems I have for similar settings and try and minimise the soft off power where possible.

_________________
Silverstone SG03B: E8200, Asus P5E-VM HDMI, 2Gb RAM, Leadtek 9600GT+S1 rev. 2, Samsung 500Gb, Seasonic X-400, 2x Akasa 120mm, Scythe Zipang 2 fanless


Last edited by edh on Thu Dec 20, 2012 3:39 am, edited 2 times in total.

Top
 Profile  
 
 Post subject: Re: +5VSB: a waste of power?
PostPosted: Thu Dec 20, 2012 2:41 am 
Offline
*Lifetime Patron*

Joined: Thu Apr 10, 2003 7:16 am
Posts: 1302
Location: en.gb.uk
It also powers USB devices that can be used to wake the system, for example keyboards. I have my system set to resume from S3 sleep at the press of a key - I couldn't achieve this without +5VSB. For the sake of 1W I think I can live with this. Each to their own I guess.


Top
 Profile  
 
 Post subject: Re: +5VSB: a waste of power?
PostPosted: Thu Dec 20, 2012 2:56 am 
Offline

Joined: Mon Mar 17, 2008 1:49 pm
Posts: 1256
Location: UK
nutball wrote:
It also powers USB devices that can be used to wake the system, for example keyboards.

Yes, that's where I guessed it was going.

I have tried resume on keyboard or mouse but I found it too easy to set off accidentally. Keyboards sit on desks and they're easy to knock so its not suitable if you use your desk for other things too. As you say each to their own but I find the power button serves me fine. ...and it's not just 1W, it's 1/7 of the power! :wink:

Edit: How many people use wake on keyboard? Added a poll to the original post to see where other people lie on this and whether there is power to be saved.

_________________
Silverstone SG03B: E8200, Asus P5E-VM HDMI, 2Gb RAM, Leadtek 9600GT+S1 rev. 2, Samsung 500Gb, Seasonic X-400, 2x Akasa 120mm, Scythe Zipang 2 fanless


Top
 Profile  
 
 Post subject: Re: +5VSB: a waste of power?
PostPosted: Thu Dec 20, 2012 4:46 am 
Offline
*Lifetime Patron*

Joined: Thu Feb 13, 2003 6:53 am
Posts: 1544
Location: Sweden
Usually I have my system set to go to sleep after a time of inactivity. It's nice to be able to wake the system by pressing a key. When I shut down my system manually I afterwards switch off the power strip that powers everything, to reduce wasted power.

_________________
Main: ASRock B85M-ITX | i3-4330 | 16GB DDR3 | Intel 730 240GB | HDPLEX H1-S | picoPSU | No moving parts | Idle 13.9W
HTPC: ASRock H81M-ITX | Pentium G3420 | 4GB DDR3 | Intel 520 120GB | HDPLEX H1-S | picoPSU | No moving parts | Idle 11.2W
Gaming: Intel DH77EB | i5-3570K | GTX 750 Ti | 16GB DDR3 | Intel 520 120GB | TJ08-E | G-360 360W
Server: Intel DH77DF | i3-2100T | 4TB+3x3TB | picoPSU | Idle 24W AC


Top
 Profile  
 
 Post subject: Re: +5VSB: a waste of power?
PostPosted: Thu Dec 20, 2012 9:22 am 
Offline
Moderator

Joined: Thu Oct 06, 2005 4:36 am
Posts: 4772
Location: Monterey Bay, CA
My system wakes on mouse click. System sleeps/hibernates at ~1W. Soft off is <1W. It's down in the mud for a P3 Kill a Watt's accuracy. Tested with a Corsair HX520W and a Seasonic X-560.

_________________
1080p Gaming build: i5-4670K, Mugen 4, MSI Z87-G45, MSI GTX 760 2GB Gaming, 8GB 1866 RAM, Samsung Evo 250GB, Crucial MX100 256GB, WD Red 2TB, Samsung DVD burner, Fractal Define R4, Antec True Quiet 140 (2 front + rear) case fans, Seasonic X-560. 35-40W idle, 45-55W video streaming, 170-200W WoW, 200-230W Rift, 318W stress test (Prime95 + Furmark)

Support SPCR through these links: NCIX, Amazon and Newegg


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 5 posts ] 

All times are UTC - 8 hours


Who is online

Users browsing this forum: Yahoo [Bot] and 4 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
Powered by phpBB © 2000, 2002, 2005, 2007 phpBB Group