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Old 10-08-2008, 04:05 PM   #1 (permalink)
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Default psu health Q

hi folks! a little guidance from the experienced please.

i am running a pretty average, non-pointy-end-of-technology
sytem: amd 5600, couple of hd's, dvdr, 2gig dhx6400 and a
pair of 7800gt's; all at default in a p182 with standard fans.
my psu is a hiper 525watt non-modular; quite new.

until very recently, the rails were quite sound. however, a few
days ago, the 12v leapt from 12.0-something to 12.48. the nice
people at Ebuyer sent me a corsair tx750 which i rec'd today and
shall be mounting this weekend...(building for the future?)

my question is; this leap in the 12v rail(s - i've lost the box!).
should i lose this psu or can i use it in an old system (p4) and
just keep an eye on it? or am i panicking for nothing?
in other words, is it telling me that it's on the way south?
thanks for any observations...

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Old 10-08-2008, 05:04 PM   #2 (permalink)
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Default Re: psu health Q

The ATX specs for rail voltages states that in relation to accepability, rails can be within 5% +/- of it's rated voltage.

As such the 12V rail can be between 11.4V and 12.6, since 12 x .05 = .6
and the 5V rail can be within 4.75 and 5.25, since 5 x .05 = .25
same math applies to 3.3V

so the 12v rail being at 12.41 is within atx specs.

Course its always better to buy a quality psu anyways...

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Old 10-08-2008, 05:29 PM   #3 (permalink)
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Default Re: psu health Q

He did, he bought a 750TX
Nothing to see here.
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Old 10-08-2008, 06:02 PM   #4 (permalink)
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Wink Re: psu health Q

thanks guys for the fast response. guess i'll send the 750 back then! (yeh right)
for the sake of keeping it simple, i didn't mention that i was just
testing the 7800's; i normally use a single 8800gtx and was thinking
of buying a second one. ok, it's old now but they are pretty cheap
compared to a couple of years ago. so i needed a "proper" psu anyhow didn't i??? and the 750 has lots and lots of 6pin connectors..........
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Old 10-09-2008, 12:31 PM   #5 (permalink)
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Default Re: psu health Q

Single rail psu's ftw. You'd be better off selling the 8800 and buying a 260 rather than SLI'ing 8800s.
Nothing to see here.
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Old 10-09-2008, 02:18 PM   #6 (permalink)
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Arrow Re: psu health Q

that's v. interesting Veedubfreak; i never considered a 260, and the
280 is behond my current purse. guess their must be a comparison
somewhere. i'll go take a look. better than 8800's sli? must be good
back later....

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