GTX 480 SLI on PCIe x16 and PCIe x8

fang_laluna · Jul 12, 2010, 11:50 AM

Hi,

Straightforward question, is there any performance difference/bottleneck if I run my 480SLI on PCIe x16 and PCIe x8? The card takes 2 pci slot and I'm using pci network card so the only option is to put the first 480 in x16 and the second one in x8.

Cheers

yogurt_21 · Jul 12, 2010, 01:15 PM

http://www.techpowerup.com/reviews/N...press_Scaling/

seeing that the difference is minimal, I'd say not really, at least nothign noticible.

JrRacinFan · Jul 12, 2010, 01:18 PM

The difference would be minimal.

NdMk2o1o · Jul 12, 2010, 01:22 PM

Yup 2% difference in W1zz's benches with the 480@ 8x Vs 16x

fang_laluna · Jul 12, 2010, 01:40 PM

Hmm, that's the result from 480? how bout 480 SLI?

yogurt_21 · Jul 12, 2010, 01:46 PM

Quote:

Originally Posted by fang_laluna

Hmm, that's the result from 480? how bout 480 SLI?

same difference when it comes to bandwidth so card 1 = 100% and card 2 =98% averaged together you'll be at 99% when compared to full bandwidth sli.

ie there is no real difference, do it.

fang_laluna · Jul 12, 2010, 01:52 PM

Thanks guys.

I will try vantage score to make sure

newtekie1 · Jul 12, 2010, 02:01 PM

Careful with this, it isn't always as easy.

On a lot of boards the x8 or x4 slot isn't run off the primary PCI-E lanes, and a lot of times it isn't a PCI-E 2.0 slot, but a 1.1 slot. I'm not sure about how your board does it, but if the slot is a 1.1 slot(check with GPUz with a card connected) then in the review posted earlier you want to look at the x4 results, which still aren't that bad(93%).

If it is a 2.0 slot, then you are good to go.

Jul 12, 2010, 11:50 AM	#1
fang_laluna Join Date: Sep 2009 Posts: 108 (0.08/day) Thanks: 34 Thanked 4 Times in 4 Posts System Specs	GTX 480 SLI on PCIe x16 and PCIe x8 Hi, Straightforward question, is there any performance difference/bottleneck if I run my 480SLI on PCIe x16 and PCIe x8? The card takes 2 pci slot and I'm using pci network card so the only option is to put the first 480 in x16 and the second one in x8. Cheers

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Jul 12, 2010, 01:18 PM	#3
JrRacinFan Served 5k and counting ... Join Date: Mar 2007 Location: Youngstown, OH Posts: 16,121 (7.14/day) Thanks: 4,149 Thanked 4,552 Times in 4,027 Posts System Specs	The difference would be minimal. __________________ Graphics Artists United™ Request Thread Low Cache CPU Club Solaris Utility DVD 3.0 DanishDevil's Logitech Soundroom TPU Video Gallery Sciencemark Revisited

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Jul 12, 2010, 01:15 PM	#2
yogurt_21 Join Date: Feb 2006 Posts: 4,057 (1.53/day) Thanks: 2,244 Thanked 542 Times in 443 Posts System Specs	http://www.techpowerup.com/reviews/N...press_Scaling/ seeing that the difference is minimal, I'd say not really, at least nothign noticible.

Jul 12, 2010, 01:22 PM	#4
NdMk2o1o Join Date: Apr 2010 Location: Redditch, Worcestershire, England Posts: 2,641 (2.35/day) Thanks: 332 Thanked 857 Times in 604 Posts System Specs	Yup 2% difference in W1zz's benches with the 480@ 8x Vs 16x __________________ Bioshock Infinite, FC3, Crysis 3, Shogun 2, Dirt Showdown AMD bundle keys for sale: http://www.techpowerup.com/forums/sh...d.php?t=182837

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Jul 12, 2010, 01:40 PM	#5
fang_laluna Join Date: Sep 2009 Posts: 108 (0.08/day) Thanks: 34 Thanked 4 Times in 4 Posts System Specs	Hmm, that's the result from 480? how bout 480 SLI?

Jul 12, 2010, 01:52 PM	#7
fang_laluna Join Date: Sep 2009 Posts: 108 (0.08/day) Thanks: 34 Thanked 4 Times in 4 Posts System Specs	Thanks guys. I will try vantage score to make sure

Jul 12, 2010, 02:01 PM	#8
newtekie1 Semi-Retired Folder Join Date: Nov 2005 Location: Indiana Posts: 17,747 (6.48/day) Thanks: 780 Thanked 5,115 Times in 3,706 Posts System Specs	Careful with this, it isn't always as easy. On a lot of boards the x8 or x4 slot isn't run off the primary PCI-E lanes, and a lot of times it isn't a PCI-E 2.0 slot, but a 1.1 slot. I'm not sure about how your board does it, but if the slot is a 1.1 slot(check with GPUz with a card connected) then in the review posted earlier you want to look at the x4 results, which still aren't that bad(93%). If it is a 2.0 slot, then you are good to go. __________________ Rig1: System Specs. Rig2: A8-5600K@4.4GHz / AsRock FM2A75 Pro4 / 8GB Corsair DDR3-1600 9-9-9-24 / HD7560D / Samsung DVD-Burner / 1.5TB WD Green + 3x3TB WD RED in RAID5 Rig3: Athlon X2 4200+ / M4A79 Deluxe / 4GB G.Skill Pi DDR2-800 4-4-4-12 / GT430 / Sony DVD-Burner / 500GB WD Rig4: Phenom II x6 1605T @ 3.6GHz / Asus M5A99X Evo / 8GB PNY DDR3-1600 9-9-9 / GTX470 & GTX470 / Samsung DVD-Burner / 1.5TB Seagate

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