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Old January 4, 2010, 08:05 PM
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Default PCIe slot power consumption?

Just having a look at these cards with the thought of replacing my 9600GSO cards........

http://ncix.com/products/index.php?s...anufacture=XFX

What I'm wondering is how having 4 cards on the PCIe lanes will affect power consumption since these cards don't appear to have an aux video power plug. I know there's an upwards range to how much the PCIe slots will supply, but I doubt the spec was ever intended to cover 4X oc'd cards without an aux power to the cards.

Any ideas?
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Old January 4, 2010, 09:00 PM
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Quote:
Originally Posted by sswilson View Post
Just having a look at these cards with the thought of replacing my 9600GSO cards........

http://ncix.com/products/index.php?s...anufacture=XFX

What I'm wondering is how having 4 cards on the PCIe lanes will affect power consumption since these cards don't appear to have an aux video power plug. I know there's an upwards range to how much the PCIe slots will supply, but I doubt the spec was ever intended to cover 4X oc'd cards without an aux power to the cards.

Any ideas?


if the mobo has a molex in youll be fine. else, not sure itll handle the 60 or so odd watts each pci-e is theroretically supposed to deliver...


hmmmmmmmmmm


XFX 9800GT Review Page 4 - Specifcations & Features - Overclockers Club


[COLOR=#289E28 ! important][COLOR=#289E28 ! important]Power [COLOR=#289E28 ! important]Connectors[/color][/color][/color]
1 x 6-pin














edit..yup,it may seem its no pci-e....maybe they got different batches?
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Old January 4, 2010, 09:07 PM
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Looks like a redesign..... no power connecter that I can see on this image from the NCIX website.

edit: And yeah.... I'm a little concerned about 4X old gen cards trying to pull power through the mb. Hell, even my lower power 9600GSO cards have aux power connectors.
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Old January 4, 2010, 09:17 PM
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To adhere to the PCI-E 1.1 spec, they would need to have a maximum power draw of 75W per card. Assuming a worst-case scenario, that's a total of 25A which would need to be fed to the PCI-E slots through the two +12V wires in the 24-pin ATX connector. Not a good idea.

Some motherboards have auxiliary power connectors near the PCI-E slots to deliver more power to them. Those would be the only kinds of boards that I would risk running with more than three cards lacking supplementary PCI-E power connections.
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Old January 4, 2010, 09:27 PM
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Originally Posted by Zero82z View Post
To adhere to the PCI-E 1.1 spec, they would need to have a maximum power draw of 75W per card. Assuming a worst-case scenario, that's a total of 25A which would need to be fed to the PCI-E slots through the two +12V wires in the 24-pin ATX connector. Not a good idea.

Some motherboards have auxiliary power connectors near the PCI-E slots to deliver more power to them. Those would be the only kinds of boards that I would risk running with more than three cards lacking supplementary PCI-E power connections.
That's definitely the way my thought process is going. There aren't any kind of aux molex connectors on my MSI board so I figure I'm going to err on the side of caution.
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Old January 4, 2010, 09:46 PM
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Quote:
Originally Posted by sswilson View Post



Looks like a redesign..... no power connecter that I can see on this image from the NCIX website.

edit: And yeah.... I'm a little concerned about 4X old gen cards trying to pull power through the mb. Hell, even my lower power 9600GSO cards have aux power connectors.
looks different from there gso's too..




hell the ammount if stuff on the pcb reminds me of the 8500/9500gt's
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Old January 5, 2010, 08:33 AM
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my guess, to be safe, send a email to xfx and ask with the parts number, im prety sure 9800gt without power connector have been realy done
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Old January 5, 2010, 08:52 AM
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Originally Posted by phil3_66666 View Post
my guess, to be safe, send a email to xfx and ask with the parts number, im prety sure 9800gt without power connector have been realy done
There's already a thread on the NCIX website which confirms that the new revision(s) don't require an aux power plug.

It's a wierd situation.... in most cases folks would consider it a bonus, but where I want to run 4 of them, it's not what I'm looking for.
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Old January 5, 2010, 08:53 AM
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also that cooler will probably be loud, as on the single slot 9600's...:)
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Old January 5, 2010, 09:23 AM
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my bad, dont know about the ncix thread.. but what about swiching for another brand?

NCIX.com - Buy EVGA E-GEFORCE 9800GT 550MHZ 512MB 1.8GHZ 256BIT DDR3 VGA HDMI DVI-I HDCP Video Card - 512-P3-N987-TR In Canada.
ASUS EN9800GT/DI/512MD3,NVIDIA - EN9800GT/DI/512MD3 EN9800GT/DI/512MD3

look to use pci-e connector and dual slot cooling
just dont know about your budjet...
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