OT - Electronics 101

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~misfit~

PLease excuse the slightly OT post. I have two fans here, both 12v. One says
0.19A and the other says 1.4W. Which one is gruntier?

Thanks,
 
PLease excuse the slightly OT post. I have two fans here, both 12v.
One says 0.19A and the other says 1.4W. Which one is gruntier?
Click to expand...

In theory the first one.

In practice the other one may be a better more efficient design tho.
 
Don't know about gruntier(?), but the 1.4W fan draws ~.12A

From P = EI, I = P/E = 1.4/12 = ~.12
 
~misfit~ said:
PLease excuse the slightly OT post. I have two fans here, both 12v. One says
0.19A and the other says 1.4W. Which one is gruntier?
Click to expand...


P= IE

thus the first fan 12volts x .19a = 2.28 watts
 
philo said:
P= IE

thus the first fan 12volts x .19a = 2.28 watts
Click to expand...
The first one, as you point out, REQUIRES the most power. What it does with
that power, is anyone's guess. If it has heavy fan blades, it uses some of
that to overcome greater inertia. If it has bushings rather than roller,
needle, or ball bearings then it uses some of that to overcome friction and
produce heat. You get the idea... Personally, in choosing a fan, I'd go
more by results in how much air it moves (cfm - cubic feet in a minute) and
use the power ratings as a secondary check on efficiency and whether or not
my PSU would be unduly taxed by it.

HTH,
George
 
George said:
The first one, as you point out, REQUIRES the most power. What it
does with that power, is anyone's guess. If it has heavy fan blades,
it uses some of that to overcome greater inertia. If it has bushings
rather than roller, needle, or ball bearings then it uses some of
that to overcome friction and produce heat. You get the idea...
Personally, in choosing a fan, I'd go more by results in how much air
it moves (cfm - cubic feet in a minute) and use the power ratings as
a secondary check on efficiency and whether or not my PSU would be
unduly taxed by it.
Click to expand...

First, thanks to all who replied in this thread.

I don't have CFM figures for these fans, they're sitting on my desk in front
of me and those figures I quoted are all that's written on them.

They're both 60mm fans, the first is 10mm thick and has a larger motor
(central hub) than the second which is 20mm thick. I was just wondering
which one to put on a CPU HS I have. The first, thin fan, is a lot faster
than the second. However the second has a lot bigger pitch on it's blades
(as it's thicker). Thr first is an unknown make, the second is a Sunon.
Neither says if it's ball or sleeve bearing.

Unfortunately the Sunon doesn't have the third speed-sensor wire and I like
to have the peace-of-mind of a monitoring proggy to warn me of fan failure.
(AMD system).

Thanks all.
 
~misfit~ said:
They're both 60mm fans, the first is 10mm thick and has a larger motor
(central hub) than the second which is 20mm thick. I was just wondering
which one to put on a CPU HS I have. The first, thin fan, is a lot faster
than the second. However the second has a lot bigger pitch on it's blades
(as it's thicker). Thr first is an unknown make, the second is a Sunon.
Neither says if it's ball or sleeve bearing.
Click to expand...
Its very easy, its called suck-it-and-see approach.
Fit the first fan, install simple temp monitoring s/w like Speedfan, let the
temps stabilise then run CPU-burn-in for 5 minutes and observe the temps.
Change fans and repeat the process. Make decision which one to keep based on
performance or noise criteria.
 
Alien said:
Its very easy, its called suck-it-and-see approach.
Fit the first fan, install simple temp monitoring s/w like Speedfan,
let the temps stabilise then run CPU-burn-in for 5 minutes and
observe the temps. Change fans and repeat the process. Make decision
which one to keep based on performance or noise criteria.
Click to expand...

LOL. Yeah, I thought of that. However the Sunon requires some soldering so I
can hook it up. I just thought I'd get some idea before I broke out the
soldering iron and cannibalized a different (perfectly good 90mm) fan with a
molex tap-on connector so I can power it up.

I have SETI and MBM5 on the machine so there's no need for other software.

Cheers,
 
~misfit~ wrote:

LOL. Yeah, I thought of that. However the Sunon requires some soldering so I
can hook it up. I just thought I'd get some idea before I broke out the
soldering iron and cannibalized a different (perfectly good 90mm) fan with a
molex tap-on connector so I can power it up.
Click to expand...

dooD! Just strip an inch of insulation off each wire, bend them back
over the insulation, and they fit like a banana clip into the molex
connector. Red to yellow, black to black.

--
-Luke-
If cars had advanced at the same rate as Micr0$oft technology, they'd be
flying by now.
But who wants a car that crashes 8 times a day?
Registered Linux User #345134
 
First, thanks to all who replied in this thread.

I don't have CFM figures for these fans, they're sitting on my desk in front
of me and those figures I quoted are all that's written on them.

They're both 60mm fans, the first is 10mm thick and has a larger motor
(central hub) than the second which is 20mm thick. I was just wondering
which one to put on a CPU HS I have. The first, thin fan, is a lot faster
than the second. However the second has a lot bigger pitch on it's blades
(as it's thicker). Thr first is an unknown make, the second is a Sunon.
Neither says if it's ball or sleeve bearing.

Unfortunately the Sunon doesn't have the third speed-sensor wire and I like
to have the peace-of-mind of a monitoring proggy to warn me of fan failure.
(AMD system).

Thanks all.
Click to expand...


In general, a 10mm thick fan will have a lower lifespan and more noise per
effective cooling... 10mm is too thin to have a good dual-bearing or long
sleeve bearing, so the fan will "wobble" more and given same quality of
fans, have lower lifespan and get louder, sooner. 15mm is generally the
thinnest a fan can be and have a decent bearing system. To a certain
extent it's really beyond me why anyone (manufacturers) ever use a 10mm
fan except on a video card, where the next PCI slot is a space constraint.
The cost difference could only be a few cents if that.

A 10mm thick fan is fairly inefficient at moving air. It might need
nearly twice the current to move same amount of air though a 'sink. Of
course that depends on the fan, blades, and how dense the 'sink fins are,
but in general a thin fan is the worst choice for (anything), though if
you only have the two fans then considering the vast current difference
others have already pointed out, that may be the most significant
consideration for an Athlon, how that current translates into _realized_
airflow though the 'sink.

Anyway, Sunon aren't exactly high-end but are fairly decent fans. If the
other fan were exactly same specs but an unknow brand, odds are it's not
as good as the Sunon, but since the specs aren't the same, that the Sunon
has the better all-around spec except for the question of airflow, it'd be
advise to go with the Sunon so long as it provides enough airflow for
stability.

RPM wires are nice, but I'd much rather have a great fan than an RPM
sensor... of the few systems sitting in front of me right now, only one
has an RPM sensor output for the fans yet I'm not at all concerned about
fan failure because they're reliable brands runing at only moderate,
sub-2800 RPM... Panaflo, NMB, and a Sunon I lubed with a special homebrew
synthetic lube... didn't even want to use the Sunon because it's a
sleeve-bearing, but I have a special power supply that senses fan RPM
based on noise feedback on the 2 power leads to the fan, not with a
(non-existant) 3rd RPM or rotor-lock lead, and the Panaflo and NMB fans'
citcuits are too clean to allow the power supply's sensor to register
them... it any other situation that'd be a good thing, but when the power
supply relies on "noisey" fans you do what you gotta do.
 
beav said:
~misfit~ wrote:



dooD! Just strip an inch of insulation off each wire, bend them back
over the insulation, and they fit like a banana clip into the molex
connector. Red to yellow, black to black.
Click to expand...

Thanks dude, did it, it works. <g>.
 
kony said:
In general, a 10mm thick fan will have a lower lifespan and more
noise per effective cooling... 10mm is too thin to have a good
dual-bearing or long sleeve bearing, so the fan will "wobble" more
and given same quality of fans, have lower lifespan and get louder,
sooner. 15mm is generally the thinnest a fan can be and have a
decent bearing system. To a certain extent it's really beyond me why
anyone (manufacturers) ever use a 10mm fan except on a video card,
where the next PCI slot is a space constraint. The cost difference
could only be a few cents if that.

A 10mm thick fan is fairly inefficient at moving air. It might need
nearly twice the current to move same amount of air though a 'sink.
Of course that depends on the fan, blades, and how dense the 'sink
fins are, but in general a thin fan is the worst choice for
(anything), though if you only have the two fans then considering the
vast current difference others have already pointed out, that may be
the most significant consideration for an Athlon, how that current
translates into _realized_ airflow though the 'sink.

Anyway, Sunon aren't exactly high-end but are fairly decent fans.
If the other fan were exactly same specs but an unknow brand, odds
are it's not as good as the Sunon, but since the specs aren't the
same, that the Sunon has the better all-around spec except for the
question of airflow, it'd be advise to go with the Sunon so long as
it provides enough airflow for stability.

RPM wires are nice, but I'd much rather have a great fan than an RPM
sensor... of the few systems sitting in front of me right now, only
one has an RPM sensor output for the fans yet I'm not at all
concerned about fan failure because they're reliable brands runing at
only moderate, sub-2800 RPM... Panaflo, NMB, and a Sunon I lubed with
a special homebrew synthetic lube... didn't even want to use the
Sunon because it's a sleeve-bearing, but I have a special power
supply that senses fan RPM based on noise feedback on the 2 power
leads to the fan, not with a (non-existant) 3rd RPM or rotor-lock
lead, and the Panaflo and NMB fans' citcuits are too clean to allow
the power supply's sensor to register them... it any other situation
that'd be a good thing, but when the power supply relies on "noisey"
fans you do what you gotta do.
Click to expand...

I tried them both and the thick Sunon isn't as good. The CPU runs 6°C hotter
using it.

So I guess that solves that question. It was quite a bit quieter though.

Cheers,
 
~misfit~ said:
Thanks dude, did it, it works. <g>.
Click to expand...
I am the king of bodge... ;)

--
-Luke-
If cars had advanced at the same rate as Micr0$oft technology, they'd be
flying by now.
But who wants a car that crashes 8 times a day?
Registered Linux User #345134
 
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