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GTX 580 Phantom SLI

Last response: in Graphics & Displays
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March 8, 2011 8:24:28 AM

Hello, i'm going for a 580 sli configuratiion and i was wondering how many slots whould 2 GW 580 Phantom take on a Maximus IV? Would 850w be enough to run this GFX configuration plus 4HDD? Thanks for the help.

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a b Î Nvidia
March 8, 2011 12:26:59 PM

That power supply is going to be cutting it close. I've been toying around with an appliance load tester on my machine (see signature). During windows operations, my machine runs around 250W. I regularly run from 700-800W when gaming with 2 580s. I'm running 2 HDD and 1 SSD. Which 850W PSU are you using? The spec for a standard 580 is 244W. Yours will probably use slightly more due to additional requirements for the RAM and possibly due to the added fans. As a result (using W/V), you also need to make sure you have at least 20-22A/card and another 10-12A for the processor on the 12V rail. You should target 56A+ on a single 12V rail or make sure you have at least 22A available on each 12V rail over multiple rails (depends on the PSU).

Additionally, I would suggest a 950W+ PSU to account for the inefficiencies of aging capacitors and other aging equipment in your system over time.

The additional RAM on the cards will probably draw a little more power, but nothing substantial.

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March 8, 2011 1:15:28 PM

Yes i figured 850 would be very close to limit so i cutted some budget here and there to make space for a corsair AX 1200 which, i read, has good ratings. Everyone is welcome to suggest a better one.

I'm affraid the space is gonna pose the bigger problem. I still gotta place the order so i had no "field" experience with the parts but the Phantom is rated 2.5 slots. I've a dedicated audio card which would need a pci and i'm not sure everything is gonna fit on the Maximus IV Extreme if i get 2 phantoms. Anyone has advice?
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March 8, 2011 1:43:49 PM

It's not an issue to use the on-board one but i'm not comfortable excluding 2 slots just to fit a bigger (as good as it might be) cooler. I think i'm gonna get a pair of MSI 580 twinfrozr II or is there any better option (excluding water cooled ones)?
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a b Î Nvidia
March 8, 2011 5:07:05 PM

I like my PNY cards because of the limited lifetime warranty and because I could return them directly to the Microcenter a few miles from my house if there was anything wrong with them out of the box. I have a tendency to seek out this convenience with the higher-priced parts.

3yrs parts/2 yrs labor is decent with the MSI cards and they're at a 800MHz core. Gigabyte has one with almost the same spec (795MHz core) with three big fans and heatpipes and a 3/3 warranty. I had some Gigabyte factory OC'd 5850s which had the three fans and similar heatpipes. They ran 10C cooler than my HIS 5850 with standard cooling. Based on that experience, I'm guessing they offer decent cooling on the 580 as well.
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March 10, 2011 9:54:36 AM

Judging from this image i was thinking if it's possible to set a triple slot one on PCIEX16_1 (the first from right) which whould take up to PCIEX16_2 (the third from right) and a second triple slot one in PCIEX16_4 (the fifth from right) which would take up to, well, out of the mobo i guess? Also, would this configuration, if possible, run at x8/x8?
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Best solution

a b Î Nvidia
March 10, 2011 12:18:29 PM

You may have to put it into the PCIEX16_3 slot.

Going by the card spec, once you have two cards in there, they'll be running 8x/8x. A three card configuration, on the other hand, provides 8x/16x/16x. It's just the way the Maximus board works. Tom's did a review a while back about the difference between using 8x and 16x lanes for video and the results were negligible, so it's nothing to worry about.

Here's the link to the manual for your motherboard:

http://support.asus.com/download/download.aspx?modelnam...

You'll see they have "recommended" configurations when running in SLI (slots 16_1 and 8_3), but I'm not necessarily sure you have to do things this way. Most times when something is "recommended", it's best to comply, but there's no harm in trying the way you want it.

Additionally, because you'll now be using standard thickness video cards, if you use the "recommended" slots it will free up pcie_4_1 for your sound card.
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March 17, 2011 10:14:57 AM

Best answer selected by LoneHertz.
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a b Î Nvidia
March 17, 2011 11:08:08 AM

Quote:
Need atleast a 1000 watt for 580s in Sli

This is true if you're going with 3 cards. I have a system with two 580s and regularly reach the 750s when I measure wattage with an appliance load tester on my system while playing MOH. I've never seen it higher than that. 3 580s would definitely require additional power. Going with 3 cards, I'd recommend a 1100W PSU, at least, because you're potentially adding a requirement of an additional 264W (at max load) for an additional 580. If I'm already at 750+ adding a 3rd card (at max load) would require at least 1014W! WOW!
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a b Î Nvidia
March 17, 2011 1:40:14 PM

Nope. Nothing is overclocked. The 580 cards require up to 22A on the 12V rail each.
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