Power Supplies Exhaust or Intake?

C

Castle

New Member
Typically are there any performance gap between the a power supply being implemented as an exhaust or intake?
Generally is it a better concept for power supply mounted at the top of the case with a intake fan at the bottom of it and an exhaust fan on the rear side of it(which is where you connect to the powerpoint).
Interested in a power supply with a intake 12cm or 14cm fan and a 80cm exhaust power supply. Any clues of those?
 
tecnically the PSU will be better as an intake from the back and exhaust in the case, but the rest of your components will fry, cause you blowing hot air into the case.

The best is to have a PSU at the bottom. cause hot air rises and it takes "cooler" air.

Rather have a normal PSU, the PSU can handle that heat, but you dont want your mobo, GPU and CPU to start seent temp rises...
 
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I appreciate for your take on it. Another reason for seeing the power supply being mounted at the top would be easier for cable routing am I right? For some reasons I prefer the conventional ways having seen that the new standard is a total new method of distributing air around the case.
http://www.sunbeamtech.com/PRODUCTS/Power-supply/NUUO/nuuo-550.htm
I am interested in a power supply as seen on 80 mm exhaust fan and 120 mm intake fan diagram.
After browsing on newegg, there is no search result indicating such a product.
There was a sunbeam product which was a 80 mm and 80 mm intake and exhaust.
http://www.newegg.com/Product/Product.aspx?Item=N82E16817182030
Anyone here can search for such a power supply with a 80mm exhuast and 12cm/14cm intake power supply fan?
 
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It seems to me that the 80mm exhaust would hinder the flow of the 120mm.
That might be the reason why it's hard to find what your looking for.
 
Castle said:
I appreciate for your take on it. Another reason for seeing the power supply being mounted at the top would be easier for cable routing am I right? For some reasons I prefer the conventional ways having seen that the new standard is a total new method of distributing air around the case.
http://www.sunbeamtech.com/PRODUCTS/Power-supply/NUUO/nuuo-550.htm
I am interested in a power supply as seen on 80 mm exhaust fan and 120 mm intake fan diagram.
After browsing on newegg, there is no search result indicating such a product.
There was a sunbeam product which was a 80 mm and 80 mm intake and exhaust.
http://www.newegg.com/Product/Product.aspx?Item=N82E16817182030
Anyone here can search for such a power supply with a 80mm exhuast and 12cm/14cm intake power supply fan?
Click to expand...

Apparently there is one being seen there on newegg, the Sunbeam NUUO 550W Power Supply except for it been an obseleted product range.
There is however, the ENERMAX Noisetaker II 485W Power Supply which conforms to the input output fan placement design but there being seen with dual 80mm cooling fans instead of a 80mm, 120mm variable.
 
I can see the justification behind dual fans on a PSU the size of the Galaxy, but an efficient 450W really shouldn't need that much airflow to remain cool. Any particular reason you're after this fan combination? If you do end up getting one, make sure that you're not getting a low efficiency unit which uses the dual fans to compensate for the added heat generation...
 
ceewi1 said:
I can see the justification behind dual fans on a PSU the size of the Galaxy, but an efficient 450W really shouldn't need that much airflow to remain cool. Any particular reason you're after this fan combination? If you do end up getting one, make sure that you're not getting a low efficiency unit which uses the dual fans to compensate for the added heat generation...
Click to expand...

Some reviews shown that a power supply with a 80mm exhaust has proven much more cooling efficiency compared to those 120mm or 140mm intake. Especially when purchasing a casing where the power supply is mounted at the top thus following the conventional power mounting guideline.
What would you conclude about the enermax 485W power supply by cathay? Is it a solid and not a low efficiency unit?
 
Castle said:
Some reviews shown that a power supply with a 80mm exhaust has proven much more cooling efficiency compared to those 120mm or 140mm intake. Especially when purchasing a casing where the power supply is mounted at the top thus following the conventional power mounting guideline.
What would you conclude about the enermax 485W power supply by cathay? Is it a solid and not a low efficiency unit?
Click to expand...

Yeah it's about 80% efficiency for most of the load range.
 
I believe that they're about 80% (good ones are more like 85%) when there's roundabout a 50% load.

And if you have your PSU take air from inside the case and blow it out it will act as an exhaust case fan as well as a PSU cooling fan seeing the air it takes from inside the case must come from outside as well. And if your PSU is on the bottom of the case it might help the Videocard cooling a bit but I can't see it doing very much seeing it really doesn't suck up all that much air (most PSU's don't get all to hot).
 
Castle said:
Some reviews shown that a power supply with a 80mm exhaust has proven much more cooling efficiency compared to those 120mm or 140mm intake. Especially when purchasing a casing where the power supply is mounted at the top thus following the conventional power mounting guideline.
What would you conclude about the enermax 485W power supply by cathay? Is it a solid and not a low efficiency unit?
Click to expand...

I was quite surprised to note that the Sunbeam NUUO SUNNU550-US-SV550W was mentioned by one of those picks for the midrange series of power supply as seen on
http://www.computerforum.com/69535-post4.html

If you do feel doubts about the Enermax Noisetaker II, you can be sure that those power supplies filed under http://www.computerforum.com/69535-post4.html and http://www.computerforum.com/90117-ceewi1-s-psu-recommendations.html can be an alternative source apart from the Sunbeam Nuuo which could be updated for it being a discontinued model.
The Enermax Noisetaker II does features the ingredients for a midrange power supply for its price too with 80% efficiency.
 
The Nuuo is an old, discontinued model, which was a good value, PSU. The recommendations list in PSU101 is now very outdated, and while mine is more recent, I really need to update it again.

The Enermax 485W was unquestionably a very good unit for its time, but that was several years ago. While it's efficiency is reasonable, and it will still perform well, I don't really think it's worth $80. It's efficiency will be in the high 70% range, which while reasonably good, is still considerably below a modern high-efficiency unit.

As for 120mm vs 80mm, it really depends on what you mean by efficiency. Moving the same airflow through the unit from back to front with an 80mm fan will be more effective at cooling the unit than moving it upwards with a 120mm fan, but the 120mm fan can move more air than the 80mm can with similar fan speeds and noise output. Bottom mounted 120mm fans can potentially cause 'hotspots' in the unit where the airflow can not reach, but for well designed PSUs, particularly lower wattage models, this is really a non-issue - they are designed with this in mind, and I mention it only because of the specific nature of your question.

This is an extreme generalisation, but a lot of server grade units use 80mm fans to be able to cope with the rugged conditions they are exposed to, while a lot of consumer grade units use 120/140mm fans for quieter operation. The type/quality of the fans and overall design of the unit is every bit as important as the fan configuration, though. Dual fans are likely to be louder than a single fan configuration at this wattage.

Honestly, I wouldn't base my choice of PSUs on fan configuration unless you have a compelling reason to do so (e.g. won't fit in your case). When you're specifically looking for dual fans like this you're drastically reducing your choice of PSUs. If you're going for this fan configuration, though, the Enermax is probably about the best on offer in this wattage range at newegg. This is another good deal at a lower price: http://www.newegg.com/Product/Product.aspx?Item=N82E16817182030
 
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