It is currently Thu Dec 25, 2014 5:35 pm

All times are UTC - 8 hours




Post new topic Reply to topic  [ 6 posts ] 
Author Message
 Post subject: Running a 200W psu without fans.
PostPosted: Sun Mar 10, 2013 6:23 am 
Offline

Joined: Sun Mar 10, 2013 6:19 am
Posts: 2
I'm building a HTPC with a dual core celeron ivy bridge processor. I'm guessing the whole system will take up like 50 watt on load since its also using onboard graphics.

I have the following PSU coming in soon http://www.lc-power.de/index.php?id=366&L=1

I want to run the PSU without the fan. It's only 200w I doubt it'll get hot right?

What's your thoughts on this?


Top
 Profile  
 
 Post subject: Re: Running a 200W psu without fans.
PostPosted: Sun Mar 10, 2013 8:03 am 
Offline

Joined: Mon Mar 17, 2008 1:49 pm
Posts: 1259
Location: UK
Welcome to SPCR!

If you look through the SPCR PSU articles there were some early experiments with running standard PSUs passive. They were generally pretty risky. A modern PSU might be more efficient but you are dealing with heat in many small components, not just the large MOSFETs which are attached to a heatsink.

What sort of case will this go in?

It seems perhaps a bit extreme unless the rest of the system has no moving parts already. Rather than going straight in and trying this with a new build I would first put the system together, listen to the noise level of individual components, measure the power consumption and then experiment with making changes. If the PSU fan is not thermally controlled and runs at 12V all of the time then you should be safe to try running the PSU fan at 7V, 5V or even 3.3V. You could also try removing the fan grill to improve airflow. These steps are not as extreme as running fully fanless and more likely to be successful.

_________________
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: Running a 200W psu without fans.
PostPosted: Sun Mar 10, 2013 8:06 am 
Offline
Moderator

Joined: Thu Oct 06, 2005 4:36 am
Posts: 4775
Location: Monterey Bay, CA
Short answer: Don't do it.

Longer answer:

The manufacturer doesn't list this PSU's efficiency and it doesn't appear to be 80 Plus rated. So, chances are, it's 80% efficient at best and they just didn't bother spending the money and time to get it 80 Plus rated. At worst, it's an old school 70% efficient supply.

50W load under what scenario? Idle? video playback? h.264 encoding? You don't mention the other system components, so it's hard to know what your true idle/load scenarios will be. If you take the components in Hardware.info's mobo roundup, the best case idle, 3DMark Vantage, and Cinebench measurements are 24W (AC), 61W, and 84W. Replace the quad with your Celeron, and it would go to roughly 24W, 55W, and 62W. If your PSU met 80% at low loads (doubtful), the internal heat is ~5W at idle to ~12.5W running Cinebench.

If your PSU is closer to 70%, this could go up to ~ 26W, 61W, and 68W. That's 7.5W to 20W of heat dissipation inside the PSU. If your mobo uses more power than the most efficient one I used here, then this could make your idle and load go up another 20-30W with commensurate heat load.

So, no, I wouldn't kill the fan. If you want quiet and SFX form factor, consider getting an 80+ Gold rated PSU.

_________________
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  
 
 Post subject: Re: Running a 200W psu without fans.
PostPosted: Tue Mar 12, 2013 6:21 pm 
Offline

Joined: Sun Mar 10, 2013 6:19 am
Posts: 2
How dos running a fan on a lower voltage work.
Do I cut the white and red wire and twist the red to the white one going in the circuitboard?

Would this work even if its not the best option?


Top
 Profile  
 
 Post subject: Re: Running a 200W psu without fans.
PostPosted: Tue Mar 12, 2013 8:00 pm 
Offline
*Lifetime Patron*

Joined: Sun May 21, 2006 9:09 am
Posts: 1935
Location: Northern California.
what mobo are you (going to be) using?
unkletom wrote:
How dos running a fan on a lower voltage work.
Do I cut the white and red wire and twist the red to the white one going in the circuitboard?

Would this work even if its not the best option?

http://www.silentpcreview.com/article6-page1.html


may i sugest an alternative to your choice in psu?
http://www.silentpcreview.com/article601-page1.html

_________________
Please support SPCR by buying your gear through these links: NCIX, Amazon and Newegg


Top
 Profile  
 
 Post subject: Re: Running a 200W psu without fans.
PostPosted: Sat Mar 23, 2013 1:47 pm 
Offline

Joined: Mon Feb 04, 2013 9:56 am
Posts: 51
Run the fan slower by adding a resistor in the cable. Depending on the fan, about 100ohm 1W is about right. Make sure to insulate the connections, I use heat-shrink.

_________________
Workstation: i5-4690K@4.7GHz, Asus Z97I-Plus, 8GB Kingston DDR3-1600, Crucial M500 480GB, WD1003FZEX, Win7
Server: i3-4350, AsRock E3C224D2I, 16GB ECC, Intel 520 180GB, 2x Toshiba 5TB, 2xWD50EFRX, Server 2012R2, Stablebit Drivepool
HTPC1: TranquilPC ABEL H2, i3, 4GB DDR3L-12800, Crucial M4 128GB mSATA, Win7
HTPC2: Akasa Euler, DH61AG, Pentium G620, 4GB DDR3L-10666, Crucial M4 64GB mSATA, Win7


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 6 posts ] 

All times are UTC - 8 hours


Who is online

Users browsing this forum: No registered users and 2 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