Sign in with
Sign up | Sign in
Your question
Solved

PSU Power Dilemma

Last response: in Components
Share
November 30, 2009 3:58:02 AM

Got the Antec EarthWatts EA650 650W for $60 ( $40 after MIR ) http://www.newegg.com/Product/Product.aspx?Item=N82E168....

Had an impulse buy of PNY XLR8 VCG98GTEE1XEB GeForce 9800 GT 1GB for $100 ( $80 after MIR ) http://www.newegg.com/Product/Product.aspx?Item=N82E168...

Note the ratings given in the specification tab : "A minimum 400W or greater system power supply (with a minimum 12V current rating of 26A)"

The above PSU is spec'ed @ 25A whereas the card wants "(with a minimum 12V current rating of 26A)"

The PSU has 3 "independent rails" : +12V1@22A, +12V2@22A, +12V3@25A

Any suggestions EXCEPT ( maybe? ) changing the PSU :-) ?

Like patching cables? Crossing Fingers? :-)

More about : psu power dilemma

November 30, 2009 4:13:46 AM

You will be absolutely fine.
m
0
l
a b ) Power supply
November 30, 2009 4:58:24 AM

I would also like to know that wont the current be a problem? I can safely say that wattage wise the PSU is fine for a 9800GT, somewhat of an overkill.
m
0
l
Related resources
a c 248 ) Power supply
November 30, 2009 5:57:35 AM

Generally speaking if a power supply is advertised as having mutiple +12 volt rails you can add the individual rails to get a rough approximation of the total current (amps). The total will not be exact. It will usually be a little less. High quality power supplies will come very close to the combined total. Low quality psu's will have a lower total.

The vast majority of power supplies advertised as having mutiple +12 volt rails do not have true separate rails. They have only one large rail. Think of them as having "virtual rails". The advertising gurus really stretched the truth. Big stink over that a few years ago. There are a few power supplies that really do have separate rails. They are usually high end, high wattage models

For the typical user and the typical gamer single and multiple rails are not an issue.

Here is a link to an outstanding article by jonnyguru that explains multiple rails:

http://www.jonnyguru.com/forums/showthread.php?t=3990
m
0
l
November 30, 2009 10:27:27 AM

If I remember correctly, jonnyguru had a review of the VERY SAME PSU and they did conclude that the rails were independent and not shared.

@bige420 - are you suggesting that the manufacturer has quoted too high a value and it will never actually reach that requirement of "minimum 26A"?
m
0
l

Best solution

a b ) Power supply
November 30, 2009 12:00:45 PM

Usually, the manufacturer of the GPU recomend the PSU with a system configuration like this:

Core 2 Quad extreme to full load, Velociraptor, GPU to full load, RAM to full load....

Some moths ago, I install my X4 955, a GTX260, 2x500GB Itachi, DVD-RW,CD-RW, 4GB Crucial Ballistix Tracer and a case computer with 3 fans....all this with a 500W PSU Thermaltake, so, your current PSU is more that enough for the system.
Share
a c 144 ) Power supply
November 30, 2009 5:57:51 PM

KamalS said:

Note the ratings given in the specification tab : "A minimum 400W or greater system power supply (with a minimum 12V current rating of 26A)"

The above PSU is spec'ed @ 25A whereas the card wants "(with a minimum 12V current rating of 26A)"

The 26 amps is the total recommended system rating. According to this, you have plenty of power

KamalS said:

The PSU has 3 "independent rails" : +12V1@22A, +12V2@22A, +12V3@25A

Forgive me, but that a common mistake. That's 69 amps for a total of 828 watts. :lol:  Look at the second line on the PSU label, the one that says max 12 volt power is 540 Watts - 45 amps.
m
0
l
!