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Old 10-31-06, 05:03 PM   #445
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Default Re: GeForce 8800 GTX is selling?

I was just wondering about power supplies for this card. I am planning on running two 8800GTXs and need a PSU that can back them up. I was thinking of this one. http://www.newegg.com/Product/Produc...82E16817341002

Will that be enough for me to run these?
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Old 10-31-06, 06:01 PM   #446
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Default Re: GeForce 8800 GTX is selling?

Quote:
Originally Posted by Wolken007
I was just wondering about power supplies for this card. I am planning on running two 8800GTXs and need a PSU that can back them up. I was thinking of this one. http://www.newegg.com/Product/Produc...82E16817341002

Will that be enough for me to run these?
It should be enough as long as you don't have a heap of HDDs and Optical Drives. Looks like it has 4 PCI-E connectors so you should be fine.
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Old 10-31-06, 06:02 PM   #447
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Default Re: GeForce 8800 GTX is selling?

Quote:
Originally Posted by Wolken007
I was just wondering about power supplies for this card. I am planning on running two 8800GTXs and need a PSU that can back them up. I was thinking of this one. http://www.newegg.com/Product/Produc...82E16817341002

Will that be enough for me to run these?
If you ran your system really lean (and I mean lean), then you might be fine running 2 GTX's on that PSU because you have two dedicated 12v rails with 18A apiece. The wattage would be where there's a concern.

But I'll tell you like I told Redeemed. Strip out every extra hard drive, optical drive, case fan, led, etc that you don't absolutely need and it should work. But when you map the PCI-E connectors (because that PSU only has two of them and two GTX's take 4) this is how you should map them:


Card 1:
PCI-E1
Two molexes to y-adapter

Card 2:
PCI-E2
Two molexes to y-adapter


Make sure you do not plug both PCI-E connectors into the same card. You would be supplying 36A to just one card and making the other card share resources with the rest of your system. You want each card pulling off its own dedicated 12v rail, and each one of your PCI-E connectors pulls off a different rail. The other plug on both cards could be had by using two of your molex connectors on your power-supply to a y-adapter/PCI-E cable. Like this:

http://www.newegg.com/Product/Produc...82E16812189120

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Old 10-31-06, 06:04 PM   #448
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Default Re: GeForce 8800 GTX is selling?

Quote:
Originally Posted by crainger
Looks like it has 4 PCI-E connectors so you should be fine.
No, it doesn't. It only has two. But it's still doable for the reasons I listed above, I think.
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Old 10-31-06, 06:19 PM   #449
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Default Re: GeForce 8800 GTX is selling?

Quote:
Originally Posted by Xion X2
No, it doesn't. It only has two. But it's still doable for the reasons I listed above, I think.
Oh I thought I saw 4... Probably the 4 pin looked like 6 pin PCI-E connectors


Oh the 8800GTX is appearing in AU stores http://www.auspcmarket.com.au/show_i...egory_id]=1506

Prices are high, but cheaper than when the 6 and 7 series launched.

EDIT: My 8800GTX is now Pre ordered!

Last edited by crainger; 10-31-06 at 06:47 PM.
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Old 10-31-06, 08:55 PM   #450
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Default Re: GeForce 8800 GTX is selling?

Okay, I'll give some more background on my system. I am running an X2 4400+ with 2GB OCZ Platinum mem and only one hard drive and one optical drive. I also have an x-fi xtreme music and a couple of case fans that I run. Given that information, do you think the 700W PSU listed above would work? Otherwise, what PSU would you recommend so that I am safe. Thanks for the help.

I suppose I would consider this.
http://www.zipzoomfly.com/jsp/Produc...uctCode=270343
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Old 10-31-06, 09:13 PM   #451
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Default Re: GeForce 8800 GTX is selling?

^ If you're going to step up to 850W, which would be the safest way to go for two 8800GTX's, then you need to go with the PSU that I have (Silverstone ST85ZF) instead of that Galaxy. JonnyGuru found a pretty bad ripple on the 12v rails of the 1000W Galaxy when under extreme load. As a control measure, he tested a second Galaxy that had the same problem. Their build quality is a little bit questionable right now. You can read more about it here:

http://www.jonnyguru.com/PSU/Galaxy1K/

A ripple could end up damaging your components if it gets too bad, especially your RAM.

Go with the Silverstone. It's a little more expensive, but the build quality is better.

Also, if you're going to buy a quad-rail PSU, then make sure you read up on that link I gave you. That guy has a lot of reviews on various PSU's that he's tested wherein he tells you where the power-draw is coming from on each connector. This will be important when 8800GTX comes out since it'll be consuming a lot of amps on the 12v rail.
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Old 10-31-06, 10:11 PM   #452
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Default Re: GeForce 8800 GTX is selling?

So do you guys think these things will be up on Newegg on the 8th?
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Old 11-01-06, 02:33 AM   #453
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Default Re: GeForce 8800 GTX is selling?

Quote:
Originally Posted by mike686
So do you guys think these things will be up on Newegg on the 8th?
I assume they will be up on launch day, thats what everybody is waiting for.
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Old 11-01-06, 02:38 AM   #454
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Default Re: GeForce 8800 GTX is selling?

Has it been said if G80 will be able to remove aliasing from specular maps? I would really like to see this. I would like to see a totally clean image, free from all shimmering, and I have yet to see it on with some of the latest games and graphic features out there, as I often see pixel shimmering around edges where I see what appear to be highlight and bump map thingy's. Older games like fable are perfectly clean, but lack the fancy flashy stuff that causes the pixel shimmering. Transparency antialiasing was one of my favorite features of G70.
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Old 11-01-06, 03:15 AM   #455
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Default Re: GeForce 8800 GTX is selling?

http://www.jonnyguru.com/forums/showthread.php?t=266

"The box says that the minimum requirements are that the PSU offers at least 30A on the 12V rail for the entire system."
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Old 11-01-06, 09:06 AM   #456
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Default Re: GeForce 8800 GTX is selling?

Quote:
Originally Posted by zerobeta
http://www.jonnyguru.com/forums/showthread.php?t=266

"The box says that the minimum requirements are that the PSU offers at least 30A on the 12V rail for the entire system."
That's deceptive, because it doesn't tell you if that's a single-rail, dual-rail, or multi-rail PSU.

If you understand ATX specs of power-supplies, on dual-rail PSU's you cannot put anything else on the same rail as the CPU. Which means if you have a dual-rail PSU with 30A total (15A on rail #1, 15A on rail#2) then that most likely won't be enough since you'll only have 15 to run most of your system off of, instead of the 30A that nVidia recommends.

It's a confusing issue and you can only understand it fully after some research into power-supply design. But believe me, once you've seen 3 or 4 dual-rail PSU's fail consistently under load from a high-end system, you begin to pay a little more attention to these specs.
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