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I26
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2004-01-31T20:42:36Z
How many fans can you connect to one psu? Can you hook more than 1 or 2 to one molex connector from the psu if the have a male/female molex on the fan wire? I see people with a krap load of fans and wonder how they manage all that. I know the mobo sometimes supports a few by connecting them to the pin[censored]ard.:confused:
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Faluzure
2004-01-31T21:11:42Z
you can hook as many up to a psu as you want, provided ur psu has enough juice to power them all, if ur system starts getting unstable, uve too many fans.
I26
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2004-01-31T21:27:36Z
Quote:

Originally posted by Faluzure
you can hook as many up to a psu as you want, provided ur psu has enough juice to power them all, if ur system starts getting unstable, uve too many fans.


So piggy-backing them is fine?
Telexen
2004-01-31T21:50:59Z
As many as the power supply will power. You can figure the wattage usage of a fan with the simple equation, "Volts * apmerage = wattage"...the voltage and amperage of a fan will almost always be listed on the back of it (on little stickers) (remember the fan uses 12v unless you throttle that down...duh )... I think most 80w fans come out to around 2-5 watts, though CPU fans may use more (since they spin so much faster)

You don't really need male/female molex connectors to power them. I think the ideal way to power tons of fans wouldbe to use a speaker terminal like this  (pic courtesy of Fanbus )
CompHobbyist
2004-02-01T01:00:23Z
I have 7, and my cheapo PSU is doing just fine. Most of mine are no-name fans out of old PSUs, they all draw about 2W each. High-end fans will draw more current as they're pushing more air faster, so just multiply the current by the voltage as Telexen said, then add it to the total dissipation of all your other hardware. If it's within about 10-15% of the max constant PSU output (20-30% if no-name PSU as most no-names list the max surge output as max constant output) then you probably need a better PSU (EDIT: or take a look at my page on dual ATX PSUs ) especially if you're going to upgrade something else soon. Note that I pulled the percentages above right from you-know-where, so they are guesstimates and may be wrong. The rest of the numbers are calculated properly.
boa
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2004-02-01T13:56:56Z
Just DL MBM5 and check your 12v Rail. If it drops below 11.3v then its under too much load. I keep mine at least at 11.5v if not higher. I kinda whish I had pots to adjust on this PSU. I beefed up the 5v & 12v rails on my FSP350 with an adjustable pot
If I could only adjust the 3.3v rail I could overvolt my ram
I26
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2004-02-01T16:26:23Z
Quote:

Originally posted by boa
Just DL MBM5 and check your 12v Rail. If it drops below 11.3v then its under too much load. I keep mine at least at 11.5v if not higher. I kinda whish I had pots to adjust on this PSU. I beefed up the 5v & 12v rails on my FSP350 with an adjustable pot
If I could only adjust the 3.3v rail I could overvolt my ram



What do u mean "pots"?
CompHobbyist
2004-02-02T01:42:13Z
He means potentiometers, or variable resistors. They're used to change settings of all sorts, including PSU reference voltage (which controls the output voltage) and all the screen settings on old monitors that have knobs instead of buttons and menus.
Bildonia
2004-02-10T17:57:44Z
i used to have two fans and a cathode on one 12V plug...it was only on a 330W by Antec...and it ran fine
S2
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2004-02-10T18:10:44Z
Any number amount of fans on a good enough PSU is fine, just make sure those cables get cleaned up.
I26
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2004-02-10T18:21:30Z
Quote:

Originally posted by shervin2
Any number amount of fans on a good enough PSU is fine, just make sure those cables get cleaned up.


What cables.....I bought one of those fancy shmancy psu that run via 802.11p. All i do is install a few good fans accepting the wireless type and walla....no wires.
recenps
2004-02-10T22:15:19Z
Quote:

a few good fans accepting the wireless type and walla


wireless fans?

and i can hook all 7 of my fans to one molex (via daisy chaining)

thats 3 * 120mm's and 4 * 80mm's
CompHobbyist
2004-02-11T00:38:02Z
it's a joke - get it? ha ha hee hee laugh before you look dumb...

should be just fine on the 7 fans, that's about 1A maybe 2A absolute max which should be OK on one power cable. If in doubt, just split 'em up between two cables.