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nVidia updates 7900GTX SLI and 512MB 7800GTX SLI power supply requirements

This is a discussion on nVidia updates 7900GTX SLI and 512MB 7800GTX SLI power supply requirements within the Power supplies & UPS forums, part of the Hardware category; Silverstone 750W reviewed 72A on 12V rails Heh Quad VGA support: http://www.overclock3d.net/image.php?id=854 "With the +12v4 rail peaking at 22a, this ...

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Old 22-05-2006, 06:21 PM   #17 (permalink)
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Silverstone 750W reviewed 72A on 12V rails


Heh Quad VGA support: http://www.overclock3d.net/image.php?id=854

"With the +12v4 rail peaking at 22a, this should be enough to power the latest generation of ATI cards (x1900xtx) even when used in crossfire mode."
Last edited by sandeep; 22-05-2006 at 06:28 PM.
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Old 22-05-2006, 06:31 PM   #18 (permalink)
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nice
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Old 22-05-2006, 06:35 PM   #19 (permalink)
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It will be with me by tomorrow
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Old 22-05-2006, 06:38 PM   #20 (permalink)
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actually technically 72A on +12 is wrong... read psu specs total combined load over all 4x +12v rails = 720W /12v = 60amp combined load on all +12v rails not 72A
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Old 25-05-2006, 08:57 AM   #21 (permalink)
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+12V RAIL DISTRIBUTION ON THE Silverstone 750Watts


Sent an email to Silverstone about their new 750Watt PSU, nice of them to reply....

-----------------------------------------------

Hi Sandeep, thank you very much for your interest in SilverStone. The ST75ZF has the following +12V distribution:



+12V1(18A) : CPU1
+12V2(18A) : CPU2+SATA
+12V3(18A) : MB+HDD
+12V4(18A) : VGA1+VGA2



So your dual core processor will have +12V1 and +12V2

The 7800GTX 512meg SLI cards will be drawing off of +12V4

The rest of case fans, lights, and water cooling will have +12V3



Tony Ou
SilverStone Technology Co., Ltd.
http://www.silverstonetek.com
---------------------------------------------------------

I can see why I was getting exactly the same voltage levels during my test. i.e 12.03V on both PCI-E. here I have ordered a 750W Silverstone from Auspcmarket
Last edited by sandeep; 25-05-2006 at 09:08 AM.
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Old 25-05-2006, 09:10 AM   #22 (permalink)
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+12V3(18A) : MB+HDD <-------------thats a lot right??
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Old 25-05-2006, 10:57 PM   #23 (permalink)
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By sandeep
+12V RAIL DISTRIBUTION ON THE Silverstone 750Watts


Sent an email to Silverstone about their new 750Watt PSU, nice of them to reply....

-----------------------------------------------

Hi Sandeep, thank you very much for your interest in SilverStone. The ST75ZF has the following +12V distribution:



+12V1(18A) : CPU1
+12V2(18A) : CPU2+SATA
+12V3(18A) : MB+HDD
+12V4(18A) : VGA1+VGA2



So your dual core processor will have +12V1 and +12V2

The 7800GTX 512meg SLI cards will be drawing off of +12V4

The rest of case fans, lights, and water cooling will have +12V3



Tony Ou
SilverStone Technology Co., Ltd.
http://www.silverstonetek.com
---------------------------------------------------------

I can see why I was getting exactly the same voltage levels during my test. i.e 12.03V on both PCI-E. here I have ordered a 750W Silverstone from Auspcmarket
Interesting sandeep and great info !

But what about the 3 & 5v rails, what are they suppose to be doing here ?
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Old 25-05-2006, 11:04 PM   #24 (permalink)
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hmm would of thought separate +12v rails for each PCI-E connectors which would be the ideal arrangement like the 700W OCZ GameXStream.

18A for both PCI-E isn't enough for X1900XTX/XT Crossfire or 7900GTX SLI
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