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 Post subject: Stock Gateway "300 watt" power supply
 Post Posted: Fri Jan 07, 2011 7:54 am 
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Joined: Thu Jan 06, 2011 8:40 am
Posts: 35
While i was trouble shooting what caused my HD to crash i decided to pop out the stock power supply that came with the system and test is using my Ultra power supply tester...and what i found was that the -5v wasn't working on any of the power connections on the PSU ..was just wondering if some PSU's just didnt have -5v or is the PSU is failing


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 Post subject: Re: Stock Gateway "300 watt" power supply
 Post Posted: Fri Jan 07, 2011 11:59 am 
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Joined: Sun Feb 04, 2007 11:44 am
Posts: 5976
-5V was last used in systems with ISA bus slots, where even there it had very limited use. After ISA support was removed from Intel chipsets in 1999 there was no longer any need for -5V, and it was subsequently removed from the ATX12V 1.3 (April 2003) and later power supply design guides. For more information, see Negative DC Voltages in URPCs 19th. p. 915.

Bottom line: -5V has been absent by design from modern PSUs for many years now.

Note that those PSU "testers" are virtually worthless, since they don't test the PSU under a load. Scott.


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 Post subject: Re: Stock Gateway "300 watt" power supply
 Post Posted: Fri Jan 07, 2011 12:19 pm 
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Joined: Thu Jan 06, 2011 8:40 am
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is there a better tool to test a PSU?


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 Post subject: Re: Stock Gateway "300 watt" power supply
 Post Posted: Fri Jan 07, 2011 12:25 pm 
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Joined: Thu Jan 06, 2011 8:40 am
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am only about 1/4 of the way through your 19th edition hadnt gotten there yet but thank you for the reference page it certainly enlightened me on modern PSU's


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 Post subject: Re: Stock Gateway "300 watt" power supply
 Post Posted: Fri Jan 07, 2011 12:29 pm 
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Quote:
is there a better tool to test a PSU?

Click on the 2nd link in my previous post and you'll see. <g> Scott.


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