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Curious about PSU fan placement

Poll Results: Does your PSU fan face up or down?

Poll expired: Aug 23, 2013  
  • 33% (1)
    Up - PSU fan faces the motherboard cavity, GPU, etc.
  • 66% (2)
    Down - PSU fan faces the bottom case vent
  • 0% (0)
    I don't have a case vent, so of course if faces upward!
  • 0% (0)
    My PSU has the fan in the back, so Up/Down doesn't matter.
3 Total Votes  
post #1 of 5
Thread Starter 
So I've been running my Corsair AX1200i since the winter, and the fan doesn't usually turn itself on because the system load isn't high enough. Whenever I have my case opened, I usually put my hand on the PSU cabinet and it feels quite warm. I've been running the AX1200i with the fan facing downward, pointing at the bottom case filter. Doing so places the components inside the PSU upside down, in a pocket of warm air with very little flow. My idea is, flip the PSU upside down so that the fan grille faces the motherboard and GPU, which would at least allow convective cooling while still keeping the fan from turning on.

How do you do it? With cases that have a bottom PSU vent grille, do you run your PSU facing down or up? Or are you running an older style PSU with the fan on the back?


Greg
post #2 of 5
the only problem you have is you have to be EXTREMELY careful because a screw can fall into the PSU if you mount it that way. fan grills are too wide to catch screws and screws are made from conductive material. conductive material + big capacitors = death biggrin.gif ) accidents do happen and i've hand plenty of screws fall from my fingers in the last 15 years of computer building biggrin.gif
post #3 of 5
My 2¢:

- A turned off fan inside a working PSU, even at low loads, is a gloriously retarded crime:
Quote:
Originally Posted by hammong View Post

... the fan doesn't usually turn itself on because the system load isn't high enough. Whenever I have my case opened, I usually put my hand on the PSU cabinet and it feels quite warm ...

Convection cooling is hopeless. A decent PSU fan idling @ 600 rpm or lower is noiseless, cools miles better than convection, and only draws a negligible 0.5W or less.

- If your case has good positive pressure cooling, flipping the PSU might be beneficial not from convection, but from air flowing from the case interior thru the PSU seeking a path to the exterior (this is what the stupid useless stopped fan should do from the start, move air thru the PSU). However flipping the PSU has the dangers Psyclum has noted.

- I'd hack the PSU fan controller, or the PSU fan wiring to smartly control it from outside the PSU, so that the fan never stops, and just idles at reduced rpm on low electrical loads.
HAL-9011
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HAL-9011
(14 items)
 
  
CPUMotherboardGraphicsRAM
Phenom II 960T X6 4.1GHz ASUS M4A89GTD Pro Radeon HD 6870 16 GB DDR3 1600MHz 8·8·8·24 
Hard DriveHard DriveHard DriveOptical Drive
OCZ Vertex 4 128GB OCZ Vertex 2 120GB WD Caviar Black 1TB LG DVD-RW 
CoolingCoolingOSOS
Noctua NH-D14 Accelero S1 R.2 + 2x NF-F12 Se7en x64 Se7en x32 
PowerCase
Antec TP-650W CM HAF 912 + 
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Reply
post #4 of 5
Thread Starter 
Quote:
Originally Posted by TELVM View Post

My 2¢:

- A turned off fan inside a working PSU, even at low loads, is a gloriously retarded crime:
Convection cooling is hopeless. A decent PSU fan idling @ 600 rpm or lower is noiseless, cools miles better than convection, and only draws a negligible 0.5W or less.

I agree with you. I wish the "default" fan controller mode on the AX1200i would at least set the fan to minimum speed when the CorsairLink software and dongle aren't installed. I do have a fan profile set up in CorsairLink, but I don't usually have the software running on startup.

Since I flipped the PSU over, reported temps from the CorsairLink show the temp is down almost 5C after extended idle. I used to run 39C, now it's in the 34-35C range. So far so good. =)

Greg
post #5 of 5
I like this germanic no-nonsense straight to the point reply:

Quote:
... Why cannot you make the fan stop at low loads and when the temperature of the PSU is less than 40? ...

Quote:
... we do think it's necessary to keep the fans spinning actually. The reason for this is that the components inside of the power supply need constant cooling. Doesn't matter how small the airflow is, something is better than nothing ...

http://www.be-quiet.net/forum/showthread.php?740-Do-you-make-PSU-with-fan-that-is-not-rotating-at-low-loads&s=c6fa57c64bc23fe190bdc160144c4116
HAL-9011
(14 items)
 
  
CPUMotherboardGraphicsRAM
Phenom II 960T X6 4.1GHz ASUS M4A89GTD Pro Radeon HD 6870 16 GB DDR3 1600MHz 8·8·8·24 
Hard DriveHard DriveHard DriveOptical Drive
OCZ Vertex 4 128GB OCZ Vertex 2 120GB WD Caviar Black 1TB LG DVD-RW 
CoolingCoolingOSOS
Noctua NH-D14 Accelero S1 R.2 + 2x NF-F12 Se7en x64 Se7en x32 
PowerCase
Antec TP-650W CM HAF 912 + 
  hide details  
Reply
HAL-9011
(14 items)
 
  
CPUMotherboardGraphicsRAM
Phenom II 960T X6 4.1GHz ASUS M4A89GTD Pro Radeon HD 6870 16 GB DDR3 1600MHz 8·8·8·24 
Hard DriveHard DriveHard DriveOptical Drive
OCZ Vertex 4 128GB OCZ Vertex 2 120GB WD Caviar Black 1TB LG DVD-RW 
CoolingCoolingOSOS
Noctua NH-D14 Accelero S1 R.2 + 2x NF-F12 Se7en x64 Se7en x32 
PowerCase
Antec TP-650W CM HAF 912 + 
  hide details  
Reply
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