Max CPU Fan Loading

  • Thread starter Thread starter Mercury
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Mercury

Hi all - cheers from down south.

Does anyone recall the max current draw permitted for the CPU fan connector
on EG A8N-E?

I wish to plug in a 12cm quiet (Nexus) fan on the mobo and let C&Q do its
job - the fan I have at the moment is 0.8 A? (12v, .96w) Vantec Stealth
which is 28db and too noisy for my liking.

I expect 0.8A will melt things so its not on the mobo!
 
Hi all - cheers from down south.

Does anyone recall the max current draw permitted for the CPU fan connector
on EG A8N-E?

I wish to plug in a 12cm quiet (Nexus) fan on the mobo and let C&Q do its
job - the fan I have at the moment is 0.8 A? (12v, .96w) Vantec Stealth
which is 28db and too noisy for my liking.

I expect 0.8A will melt things so its not on the mobo!
Click to expand...

Watts/Volts = Amps
0.96 / 12 = 0.080 amps

Ya slipped a decimal point somewhere :-)
I think you could run that Nexus on solar power :-)))

As for the fine Asus manual, A8N-E says:

"The fan connectors support cooling fans of 350mA~2000mA (24W
max.) or a total of 1A~3.48A (41.76W max.) at +12V."

Try as I might, I cannot offer any advice as to what the limit
is on a fan header. There are five fan headers on the board,
and how totalling 5 fans of 350mA a piece gets you 1A, doesn't
make sense. I've never been able to decipher exactly what
their arithmetic means exactly, for any Asus manual I've
looked at. Maybe I need a better Taiwanese dictionary :-)

Paul
 
Mercury said:
Hi all - cheers from down south.

Does anyone recall the max current draw permitted for the CPU fan
connector on EG A8N-E?

I wish to plug in a 12cm quiet (Nexus) fan on the mobo and let C&Q do
its job - the fan I have at the moment is 0.8 A? (12v, .96w) Vantec
Stealth which is 28db and too noisy for my liking.

I expect 0.8A will melt things so its not on the mobo!
Click to expand...
A 12v 0.96W fan, would only draw 0.96/12A. 0.08A, not 0.8A. To draw 0.8A,
it'd need to be a 9.6W fan...
The fan connector rating, is normally in the manual. Typically there is a
rating for each connector, and a maximum 'total' for all the connectors.
Your board should support up to 2A per connector, and 4A max on them all.
You should hardly even be able to hear '28dB'. However remember that a fan
will produce far more than it's rated noise level, if the flow is
obstructed, or if it is poorly mounted. A 'quiet office', is 40dB. 20dB,
is a quiet whisper at 5 feet, while 30dB, is a whisper close to you.

Best Wishes
 
The region is dead quiet... :)
Search for Akaroa on the internet.

Thanks. 30db hear is noisy.
 
Mercury said:
The region is dead quiet... :)
Search for Akaroa on the internet.

Thanks. 30db hear is noisy.
Click to expand...
I must ask. How high is the cost of living in that paradise?

Thanks,

PB
 
Day to day cost of living is OK. Real estate is the killer. Its only an hour
into Christchurch for shopping and do that 1 a week or so.

Its a great place to live, hard to get into 'cos of the cost of real estate,
but if you work on computers - sw/dev - its as accessible as any to the
world...

Cost of living is so relative. We get tourists come into town, buy a house
at a premium and live their a month a year - a large % of accomodation is in
this class. Some buy up sheep stations at millions each, build 1 x luxury
house, lease out the many acres back to farmers with diabolical views (and
sheep) for farming and just enjoy when they fly back in in their choppers..
Their is an odd mix of Land Owners sitting on fortunes, local yocals - you
can't tell these two apart, and many many tourists during summer - its dead
in winter.

BTW its volcano crater - two volcanoes back to back extinct for 70 million
years.

Well worth a drop in if you get down this way.
 
Paul said:
As for the fine Asus manual, A8N-E says:

"The fan connectors support cooling fans of 350mA~2000mA (24W
max.) or a total of 1A~3.48A (41.76W max.) at +12V."

Try as I might, I cannot offer any advice as to what the limit
is on a fan header. There are five fan headers on the board,
and how totalling 5 fans of 350mA a piece gets you 1A, doesn't
make sense. I've never been able to decipher exactly what
their arithmetic means exactly, for any Asus manual I've
looked at. Maybe I need a better Taiwanese dictionary :-)
Click to expand...

I assume they mean you can draw 24W from any one fan header, and a total
of 41W from all headers. I don't know what the lower bounds they're
giving are for though..

Motherboard fan headers seem to be quite a bit more heavy-duty than they
used to be.. some high-speed fans were known to burn out certain
motherboard fan headers and had to be hooked up to the power supply
directly. 24W would be a hell of a fan though..
 
I haven't been game to plug it into the mobo just yet but following all
comments I will next time I open the case.

Thanks...
 
Hi all - cheers from down south.

Does anyone recall the max current draw permitted for the CPU fan connector
on EG A8N-E?

I wish to plug in a 12cm quiet (Nexus) fan on the mobo and let C&Q do its
job - the fan I have at the moment is 0.8 A? (12v, .96w) Vantec Stealth
which is 28db and too noisy for my liking.

I expect 0.8A will melt things so its not on the mobo!
Click to expand...


why don't you use a Molex cable + a 12 volt plug ? There are fans
that can be monitored with special device like:

Sunbeam Theta series from http://www.sunbeamtech.com/ that is found in
the section cooling. it's support up to 8 fans and they are all
monitored and controled by a program.
 
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