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Author Topic: 12V power supplies for powering graphics cards  (Read 1276 times)
louis_net
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May 23, 2011, 04:41:18 AM
 #1

http://cgi.ebay.com/Switching-Power-Supply-Transformer-DC-12V-30A-LED-CCTV-/110656523970?pt=LH_DefaultDomain_0&hash=item19c3a48ec2
AC input: 100-120V; 200-240V.
Output: 12V , 0 ~ 30A .

About 72% efficient, should be more efficient than running a normal psu just to power cards

$40 to power two cards.

Any thoughts?


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May 23, 2011, 04:45:44 AM
 #2

Something tells me that wouldn't be such a great idea.

The absolute first issue to resolve is wiring it up.

Second is the low efficiency compared to PSUs designed for computers (which are generally 80%+).

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May 23, 2011, 04:47:16 AM
 #3

any specs about this "12V" spectrum/fluctuations/stability ?
also this device is hardly designed to 24/7 operation.
louis_net
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May 23, 2011, 04:53:42 AM
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dont foresee wiring to be too much of a problem, just more work

I guess i should buy one and stress test it

some graphs on the output of this thing, read the 12v lines


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May 23, 2011, 04:56:47 AM
 #5

I see absolutely no reason to want to do this.  It's only 360W and the efficiency is poor. 
Basiley
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May 23, 2011, 04:59:57 AM
 #6

72% is poor efficiency, sure.
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May 23, 2011, 05:30:50 AM
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At that cost you could just as well buy another psu

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May 23, 2011, 06:29:02 AM
 #8

At that cost you could just as well buy another psu
sure. about $50  for similary-rate[on 12V] PSU's is quite usual and [slight]price difference was pay back in power efficiency very quick. let alone chances to realiably work long time for such stuff.
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May 23, 2011, 05:38:55 PM
 #9

Here you go, enough power for two cards (40A 12V output but you shouldn't draw that much, 30A should be okay though), 80+ bronze, and good reviews for $35

 http://www.newegg.com/Product/Product.aspx?Item=N82E16817815007

You are just way off here.

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