Archived from groups: alt.comp.periphs.mainboard.asus (
More info?)
Paul wrote:
> In article <qh0Qe.80934$Ph4.2546710@ursa-nb00s0.nbnet.nb.ca>, Ron Joiner
> <joiner@ns.sympatico.ca> wrote:
>
>
>>I have an Antec Sonata with a 380W PSU, Asus A8N-SLI, AMD64 3500+. 1 gig
>>Corsair ram, 120 gig HDD, DVD drive and a Leadtek 6600GT.
>>
>>I plan on adding another 6600GT. Is my PSU sufficient?
>>
>>Ron
>
>
> Page 2-25 of the A8N-SLI Deluxe manual contains a Power Requirements
> table. It says 12V @ 17A minimum on the output of the power supply,
> for a pair of 6600GT. An Antec Truepower is 12V @ 18A, so it just
> squeeks by. The Asus table says 350 watts total power minimum, and
> the Truepower is 380 watts.
>
> The 6600GT draws 4 amps from +12V:
>
>
http://www.xbitlabs.com/articles/video/display/geforce6600gt-oc_3.html
>
> Whether the 3500+ is enough to drive the two cards to max power
> is a good question, so they might not make it all the way to
> 4 amps.
>
> A quick power calc:
>
>
http://www.amdcompare.com and list Athlon64. Check the part number
> for your processor and see if it is 67 watts or 89 watts. At
> 89 watts, your +12V current is 89/12 * 1/0.90 = 8.2 amps at
> 90% efficiency conversion by the Vcore circuit.
>
> Processor 8.2 amps (less if it is the 67 watt processor)
> Video 2x4.0 = 8.0 amps (CPU limited most of the time, so <8 amps)
> Disk drive = 0.5 amps
> Fans 1.0 amps (or compute the exact number using fan labels)
> Total 17.7 amps
>
> The reason I didn't include the DVD, is you aren't likely
> to be burning at the same time as gaming. If just reading
> a game CD, you might throw in another 0.5A for 12V. Good data
> is not available for most optical drives.
>
> Modify the above calculation as you see appropriate
>
> Paul
Very helpful Paul.
Ron
--
And it really doesn't matter if
I'm wrong I'm right
Where I belong I'm right
Where I belong.
Lennon & McCartney
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