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Old 03-24-08, 10:57 PM   #1
jcossin
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Arrow Got a GeForce 9800 GX2? Post your power supply specs

If you've picked up a 9800 GX2, please post the specs on your power supply and not whether things are working good or not. It's very confusing based on the different manufacturers what wattage you need, if you truly need an 8 pin connector, etc.

Please include name of power supply, watts, are you using an 8 pin connector or an adapter with a 6 pin, etc. Ideally a link on newegg with the exact power supply so people can order one up if they pick up the card.

Thanks!
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Old 03-24-08, 11:17 PM   #2
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Default Re: Got a 9800 GX2? Post your power supply spec.

XFX 9800GX2 x2 Quad SLI. I'm using the Silverstone Olympia 1kw PSU. It has a single 80amp 12volt rail. Perfectly stable, with watercooling, overclocked Quad core, 4 Hard Drives and several fans. It has 4x6 pin PCI-E connectors and 2x8pin PCI-E connectors. You can't go wrong with the Silverstones.
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Old 03-24-08, 11:20 PM   #3
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Default Re: Got a 9800 GX2? Post your power supply spec.

PC Power and Cooling 1.2 Kilowatt PSU,
Topower 1.1 Kilowatt PSU ((tested and both work in Quad SLI or 8800GTX Tri SLI mode))

Both PSU's have modular 6 to 8 pin connectors.

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Old 03-25-08, 12:11 AM   #4
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Default Re: Got a 9800 GX2? Post your power supply spec.

Hmmm, this doesn't bode well for chumps like me with a 600W Rosewill with no 8 pin connector....

Keep them coming though! Let's see if anyone is using something a little more <cough> affordable...
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Old 03-25-08, 01:21 AM   #5
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Default Re: Got a 9800 GX2? Post your power supply spec.

PC Power and Cooling has some 750Ws with 8 pin connectors at the Egg. ~$150.
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Old 03-25-08, 03:52 AM   #6
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Default Re: Got a 9800 GX2? Post your power supply spec.

It says a minimum of 630watts for a single GX2 on the box.
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Old 03-25-08, 04:13 AM   #7
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Default Re: Got a 9800 GX2? Post your power supply spec.

Well i hope my 550watt Corsair can run the bitch card You think i will be ok?
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Old 03-25-08, 05:07 AM   #8
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Default Re: Got a 9800 GX2? Post your power supply spec.

Quote:
Originally Posted by jcossin
If you've picked up a 9800 GX2, please post the specs on your power supply and not whether things are working good or not. It's very confusing based on the different manufacturers what wattage you need, if you truly need an 8 pin connector, etc.

Please include name of power supply, watts, are you using an 8 pin connector or an adapter with a 6 pin, etc. Ideally a link on newegg with the exact power supply so people can order one up if they pick up the card.

Thanks!
It's not so hard to calculate what you need to power the card(s).

From specs I found while searching on google, the card requires 40amps. Amps*Volt=Watt
So from that we see that on the 12v rail, the card needs 480w alone.
That's prolly calculated with some headroom from nVidias side tho seing as Muppet runs two of these cards with a psu with a total of 80amps on a single 12v rail, (remember, cpu draws on the 12v rail too) -also, you almost never see components draw peak power, even when you play games.

Keep in mind, if you got a psu with dual rails or more, ie 2x20 amp as what it says on my psu it's not 40amp total for example. Thats the peak value on both rails, and in such cases you can never run both(or all rails if its more then two) on peak performance (in this case 40a). One rail can do 20a while the other around 16 or so and vice versa (it varies from different PSU brands).

Also, a true 8pin pci-e delivers way more vattage(amps) then the 6pin does, so if your using a 6 to 8pin converter, make extra sure that the psu can handle such load on that rail.

So what you need to do if you have a dual rail PSU: Look at the specs sticker on the psu, it should list how many amps each rail has, might be around 16-20a on each, but it should also list total wattage on the 12v and that's where you need to look.
xxx W for 3/5v and xxx Watt for 12v and so forth. So take the 12v wattage and devide it with the volt (12v) and you see how much Amps your 12v rails combined deliver.

So again if I was to get such a card, i would prolly need a new PSU with more amps/wattage on the 12v rails. Because...
There are two 12v rails on the psu, each rated as 20a(peak) 2x20=40a, card requires 40a, but as you can never run all rails on peak, just one (mine has a combined peak of 35a (or 420w)), but also, the cpu needs it's share of amps/watt from the 12v rail too.

EDIT:
PeterJensen>> Look at the specs on your PSU, combined wattage on the 12v rail(s) (it should be listed on the sticker on the psu)
That should give you an idea. I wouldnt do it tho you risk overloading the psu but I can't say unless you provide specs on the 12v rails.
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Old 03-25-08, 05:26 AM   #9
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Default Re: Got a 9800 GX2? Post your power supply spec.

Quote:
Originally Posted by EciDemon
EDIT:
PeterJensen>> Look at the specs on your PSU, combined wattage on the 12v rail(s) (it should be listed on the sticker on the psu)
That should give you an idea. I wouldnt do it tho you risk overloading the psu but I can't say unless you provide specs on the 12v rails.


Thats the specs....is that ok?
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Old 03-25-08, 05:31 AM   #10
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Default Re: Got a 9800 GX2? Post your power supply spec.

I got the card in the mail so i hope it will work. I have no problems with the X2....
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Old 03-25-08, 05:42 AM   #11
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Default Re: Got a 9800 GX2? Post your power supply spec.

Quote:
Originally Posted by PeterJensen
VX550W
90 - 264VAC

Max Load Max Output

3.3V 30A 140W
+5V 20A
20A

+12V 41A 492W
-12V 0.8A 9.6W
+5VSB 3A 15W


Thats the specs....is that ok?
Well according to specs, the Gx2 would require 480w from the 12v rail(s)
That would leave just 12w to everything else that needs 12v in your case (or just 1amp X_X), cant imagine CPU likes that very much.

However, since even on totrure load, the gx2 would never go as high as 480w it might work. Same with cpu.
Components, such as gfx cards litsts requirements with a bit headroom in mind, but PSUs usually dont in the same manner. (ie you see dual rails, each with lets say 20a on each on the sticker (that is individual peak performance), but in reality you can put around 17a load each)

So with your psu, it might work, but it leaves very little room.
Another thing of consern is heat, when heat builds up in the PSU, they perform less. A very good psu would perform within 85-90% of its listed specs. A psu of lesser quallity might drop down just to 70% of it's total wattage, and it get worse the hotter the psu runs. This is called "Derating Curve" and _all_ psu's suffers from it.
So with heat and the derating curve in mind, I would not recomend using that psu

EDIT:
I had a faint memory of reading that the X2 you currenty use actually draw more power then the 9800gx2 after reading gx2 review on tomshardware. Didnt think of it untill i saw slaWter's post.
So i went there and looked again to be sure, and yep. X2 draws more power then the gx2 in actuall use.
http://www.tomshardware.com/2008/03/...ew/page14.html
So if your system is curently stable, it should work without problems. However since your below what nVidia recomends (580w with 40a 12rail(s)), and when calculating from specs vs requirements, Id use caution not adding more to the system. You dont wanna overload the psu.
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Old 03-25-08, 06:28 AM   #12
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Default Re: Got a 9800 GX2? Post your power supply spec.

Quote:
Originally Posted by slaWter
GTS, X2, GX2... very nice man! You're on a run
Hehe yea, work is going good Then i will have a GTS and a X2 on the table
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