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Worse performance with SLI GTX 460's than with a single card

Last response: in Graphics & Displays
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March 15, 2012 1:34:11 AM

Hello. I just decided to purchase a second EVGA GTX 460 in order to run SLI on my machine. I was able to set up the SLI, however I notice an extreme drop in my FPS when running in SLI mode as opposed to running a single card.

Specifically I am running Battlefield 3. With one card, I can play on Ultra Settings and have around 30-35 FPS. With two cards running, the FPS in Ultra drops to a dismal 8 FPS or worse, basically making the game unplayable. At times, the game will freeze and crash.

Does anyone have any idea what could be causing this and/or how I might go about fixing this?

My computer specs are as follows:

ASUS P7P55 LX Motherboard

Intel i5-760 2.8GHz Quad Core

RAIDMAX HYBRID 2 RX-630SS 630W PSU

2x EVGA GTX 460 1gb

2x2GB DDR3 SDRAM

Windows 7 64bit

Nvidia drivers : v295.73

I realize that my motherboard was not crafted to support SLI, but I use HyperSLI, which supposedly makes the SLI possible. I'm not sure if it performs the way it should, but It does give me the option to run SLI in the Nvidia Control Panel, which is not present without HyperSLI.

I thank any and all of you in advance for your help!
March 15, 2012 2:00:49 AM

So even though I was able to get SLI "running" with Hyper SLI, the PCI-E slots don't support it fully?
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a c 1382 U Graphics card
March 15, 2012 2:03:42 AM

No the X4 speed is your problem there were boards out with two slots that would support x8 x8 CF but where lacking driver support for SLI that is where it would work!
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March 15, 2012 2:06:55 AM

Alright, well thank you for your timely response. As I am not super fluent in motherboard speech, could you help me understand what I WOULD need?

My current MB has

1 x PCI Express 2.0 x16 (single at x16)
1 x PCI Express 2.0 x16 (at x4 mode, 2.5GT/s)
PCI Express x1
2 x PCI Express 2.0 x1 slots (2.5GT/s)

If I am understanding you correctly, I would need two "1 x PCI Express 2.0 x16 (single at x16)" ?
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a c 1382 U Graphics card
March 15, 2012 2:06:23 PM

Yes that is correct you need 2 x slots at x16 that will run SLI at X8 X8 speeds. Which the board you found will do.
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March 15, 2012 2:24:01 PM

Nah, Tom's has had an article on this. You don't need x8/x8 to be successful at SLI. You just need hacked drivers for SLI to work on unauthorised motherboards.
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a c 173 U Graphics card
March 15, 2012 2:35:18 PM

Does a Raidmax 630W PSU have enough power to run two GTX460s?

My guess is the driver hack. Just because it works doesn't mean its going to work well. Try trading those GTX cards for some AMD cards and see if the problem goes away.
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a b U Graphics card
March 15, 2012 2:41:50 PM

I would personally buy a new motherboard to run GTX460s in SLI...(Not biased at all xD)

Seriously though, when SLI runs properly on GTX460s you get a wonderful experience. The scaling is beautiful and the glitches have all gone :) 

Go get a new board and have fun. Do yourself a favour and OC em too, they are raring to go 800mhz +
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March 15, 2012 4:41:28 PM

Yea, I'm in the market for a new mobo at the moment. I've heard great things about SLI 460's so I can't wait to get up and running. Thanks to all of you for your help.
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a c 125 U Graphics card
March 15, 2012 5:07:45 PM

I had an MSI P55GD65 for about a month before it broke. When I brought it in, the tech said they had a lot of issues with those boards. Ended up with an Asus P7P55D Pro and this is a significantly better mobo.

Anyway looking at Newegg I'd suggest one of the EVGA boards. They're expensive but have all the features. But really as long as it's got two PCIe 16 lanes at 8x/8x you should be fine.
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