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Power Supply Location

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June 8, 2010 3:04:33 AM

I have a case that is ready for a top mounted PSU. I am looking at a PSU that has a rear and top mounted fan. Is there a standard gap that will allow enough room for air flow on the top of PSU since the upper case is not vented? Or is this a case of you get what you see. The manufacture of the PSU web site is not specific about the intended location for the PSU they manufacture.

Thanks

Phil

More about : power supply location

June 8, 2010 3:28:40 AM

I am not quite following how how you want this thing mounted. Why would you want both a side fan and a bottom fan?
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a b ) Power supply
June 8, 2010 3:04:51 PM

ct1615 said:
the PSU goes fan down in the top mount

*see pic
http://img187.imageshack.us/img187/729/picture271modvj2...


Not always the case. Check the PSU when it's turned on and see if the airflow is coming out the top, if it is then turning it upside down is going to cause problems (hot air rises)! A lot of newer cases have ducts/vents and fans at the top to remove the heat from PSUs that blow the air upwards, but there are some that take it from the bottom and blow it out the back. just have a feel when it's on and you'll know. If you don't have a vent at the top of the case and you feel that you can make one, by all means go a head, but if not you'll need a new case (or a new PSU). It'll work for a while, but eventually the components will degrade as it wont expel the air correctly and they will get hot.
a c 243 ) Power supply
June 8, 2010 3:38:55 PM

Collie147 said:
Not always the case. Check the PSU when it's turned on and see if the airflow is coming out the top, if it is then turning it upside down is going to cause problems (hot air rises)! A lot of newer cases have ducts/vents and fans at the top to remove the heat from PSUs that blow the air upwards, but there are some that take it from the bottom and blow it out the back. just have a feel when it's on and you'll know. If you don't have a vent at the top of the case and you feel that you can make one, by all means go a head, but if not you'll need a new case (or a new PSU). It'll work for a while, but eventually the components will degrade as it wont expel the air correctly and they will get hot.

It's true that the psu can be mounted in either direction if the case is vented for it. It then becomes a question of wether or not you want the psu to be acting as part of the system cooling.
Where you are going wrong is with the direction of the psu airflow.
120 mm power supply fans draw air into the psu and expel it out the rear grill, they do not blow into the case.
Some CWT oem'd units have a bit of blowback, caused by a plastic sheet in the casing that is used to help direct the airflow over the heatsinks, this makes it seem as though the airflow is opposite of what it really is.

PS; " (hot air rises) "
In a forced air system hot air goes where it is directed.
a c 164 ) Power supply
June 8, 2010 4:01:33 PM

Collie147 said:
Not always the case. Check the PSU when it's turned on and see if the airflow is coming out the top, if it is then turning it upside down is going to cause problems (hot air rises)! A lot of newer cases have ducts/vents and fans at the top to remove the heat from PSUs that blow the air upwards, but there are some that take it from the bottom and blow it out the back. just have a feel when it's on and you'll know. If you don't have a vent at the top of the case and you feel that you can make one, by all means go a head, but if not you'll need a new case (or a new PSU). It'll work for a while, but eventually the components will degrade as it wont expel the air correctly and they will get hot.


i was going to ask what PSU you have that blows hot air into the case rather then out of it but delluser beat me to it
a c 164 ) Power supply
June 8, 2010 4:05:28 PM

delluser1 said:

In a forced air system hot air goes where it is directed.


i thought hot air is directed towards internet forums??

http://www.youtube.com/watch?v=7yl3UMO-TkE

I'll be here all night folks, try the blue plate! :D 
a c 243 ) Power supply
June 8, 2010 4:14:35 PM

^lol
a c 76 ) Power supply
June 8, 2010 10:07:16 PM

In the pic that ct1615 posted, it appears that the PSU is pulling hot CPU exhaust and blowing it thru the PSU. Then there is the rear exhaust fan. I see some turbulence issues in this type of setup.
a c 124 ) Power supply
June 8, 2010 10:19:05 PM

Ubrales said:
In the pic that ct1615 posted, it appears that the PSU is pulling hot CPU exhaust and blowing it thru the PSU. Then there is the rear exhaust fan. I see some turbulence issues in this type of setup.


That's one of teh reasons why new case designs are putting the PSU at the bottom.
!