This article quotes Nvidia as saying their video card uses 145W.
You have two of them. They would be drawing from +12V. Most of the
power comes through the Aux connectors. Total 290W/12V = 24.2 amps.
http://www.xbitlabs.com/articles/video/display/gf8800_11.html
FX62 AM2 - 125 watts. With 90% efficient Vcore conversion, this
is (125W/12V) * (1/0.90) = 11.57A.
http://www.amdcompare.com/us-en/desktop/details.aspx?opn=ADAFX62IAA6CS
Two disk drives are maybe 12V @ 0.6A each. (There is also 5V
consumption, but at this point, I don't bother counting the
"small change".)
CDROMs have 12V @ 1.5A printed on the label. I've measured mine
at 12V at exactly 1.0A when spinning at max speed. But I still
use 1.5A in calculations.
Allocate 0.5A for cooling fans, and since the rating is printed
on the label, you can total those up for yourself.
Total 24.2 + 11.57 + (2 * 0.6) + 1.5 + 0.5 = 38.97A
Total 12V rail power: 12V * 38.97A = 468Watts
OCZ GameXStream OCZ700GXSSLI ATX12V 700W Power Supply
+3.3@36A,+5V@30A,+12V1@18A,+12V2@18A,+12V3@18A,+12V4@18A,
[email protected],
[email protected]
there is a picture of the label here:
http://images10.newegg.com/NeweggImage/productimage/17-341-002-04.JPG
and a clearer picture here:
http://www.jonnyguru.com/PSU/GameXStream700/IMG_0600.jpg
12V1 CPU1
12V2 CPU2 and PCI Express #2
12V3 Motherboard/accessory
12V4 PCI Express #1
The only problem I see, is each 8800GTX has two PCI
Express connectors on it. You can see the two 2x3
connectors pointing upwards here. Which means you need
a total of four connectors.
http://images10.newegg.com/NeweggImage/productimage/14-121-033-03.JPG
This power supply is $199, and has four PCI Express power
connectors. Two for each 8800GTX. And the 60A output
should be enough to drive the ~40A load.
http://www.pcpower.com/products/viewproduct.php?show=S75Q&view=techspecs
http://www.pcpower.com/products/assets/S75Q/S75E-QD2.jpg
From a total power perspective, I calculated 468Watts for
the 12V loads. I would allocate another 50W or so, for the
3.3V and 5V usage. The total power at the output of whatever
power supply you use, will max at 518W. It is possible
that the processor won't be able to run the two 8800GTX
cards flat out, so maybe they won't be drawing the 145W
they are rated for.
If the 8800GTX could be trusted to run off just one
connected PCI Express connector, you could use the
GameXStream. But I don't know if it'll work that way or
not. And I cannot find any pictures of the 8800GTX
disassembled, to see the detail around the connectors.
Nvidia has a list of certifed power supplies. This chunk
of text, is the supplies certified to drive two 8800GTX.
The Silencer 750 Quad is listed here.
http://www.slizone.com/object/slizone_build_psu.html#certified_powersupplies
"For Dual GeForce 8800 GTX
CoolerMaster Real Power Pro 850W (RS-850-EMBA)
ETASIS ET-850 850W
ETASIS ET-750 750W
PC Power & Cooling Silencer 750 Quad
PC Power & Cooling Turbo Cool 1KW-SR 1000W
PC Power & Cooling 1KW-Quad SLI (TC1KW4E) 1000W
Silverstone Zeus ST85ZF 850W
Silverstone Zeus ST75ZF 750W
Tagan TG900-U96 900W
Tagan TG1100-U96 1100W
Thermaltake Toughpower W0131RU 850W
Topower/ePower TOP-1000W
Zippy Gaming PSL-6850P(G1)-PCIE4"
HTH,
Paul