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Author Topic: 12 or 5 VDC?  (Read 1053 times)

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Offline orangeTopic starter

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12 or 5 VDC?
« on: October 03, 2007, 07:23:45 AM »
I want to buy some extra fans for cooling ppc A1200 in its original case. There is a choice between 12V and 5V powered fans. What should I choose? Which ones would put smaller strain on A500 "heavy" type PSU?
BTW, are all standard computer fans, including small ones 12V?
Anyone knows what is the voltage of that tiny fan in phase5 ppc?
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Offline rkauer

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Re: 12 or 5 VDC?
« Reply #1 on: October 03, 2007, 07:39:16 AM »
 12V is better for two reasons:

 -Less noise in +5V line (which is used for CPUs, integrated chips, memory, etc);

 -Less current to do the same.

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Offline RW222

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Re: 12 or 5 VDC?
« Reply #2 on: October 03, 2007, 02:27:46 PM »
I'd agree with the less noise reasoning. Watch the current requirement though, can soon add up with several fans. Typical 80mm fans will be around 150mA, so get three of them and you're only 50mA off overloading a 12V line rated at half an amp. The disk drive(s) needs 12V too.
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