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No option to enable SLI in BIOS or control panel

Last response: in Graphics & Displays
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August 24, 2012 6:21:52 AM

Hello guys, I seem to be having a problem that many other people are having. In the nVidia control panel, where SLI configuration should be, it only says PhysX configuration. I have updated to the latest graphics (301.42) and PhysX (9.12.0613) driver, and tried taking out the graphics cards and putting them back in. I have a PNY 560ti, and a Galaxy 560ti, and I am using the SLI bridge that came with my motherboard. Both cards are set at the same clock and memory speeds, they are identical except for the manufacturer. Any ideas on what the problem might be?


Specs:

OS: Windows 7 HP 64 bit
Case: HAF 922
Motherboard: Asus P8P67 LE B3 Revision
PSU: Corsair TX750
Memory: 12GB Corsair Vengeance
CPU: Intel I7-2600k
Cooler: Corsair H100
Graphics 1: PNY GTX 560ti
Graphics 2: Galaxy GTX 560ti
SSD 1: Crucial M4 60gb
SSD 2: Corsair Force 3 60gb
HDD 1: WD Caviar Blue 1TB
Other Parts: Corsair Link
a c 115 U Graphics card
August 24, 2012 6:38:08 AM

Hi, that motherboard does not explicitly support SLI, only CrossfireX

Only the P8P67 Pro, EVO, and WS support SLI
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a c 115 U Graphics card
August 24, 2012 6:44:58 AM

Frisbee_68 said:
So there's no way I can run this without getting a new motherboard?


There's no technical reason why it won't work, it's purely for marketing purposes. There may be a firmware or driver hack floating around similar to the one that enabled SLI on the Intel 4 series motherboards
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August 24, 2012 6:45:41 AM

So there's no way I can run this without getting a new motherboard?
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August 24, 2012 6:47:45 AM

Would you know how to get that? I really need this to work :( 
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August 24, 2012 6:50:35 AM

Also, the motherboard came with an SLI bridge but no CrossfireX bridge...
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a c 115 U Graphics card
August 24, 2012 6:51:41 AM

I took a quick look and couldn't find anything. The LE is not exactly a very popular board so I wouldn't be surprised if you're SOL.

Some owners of the Pro boards that had problems enabling SLI suggested updating the firmware but the Pro supports SLI while yours does not.
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August 24, 2012 6:53:32 AM

Ok. So then I have to get a new motherboard...but the PRO, Deluxe, and EVO are all discontinued and the WS is $250...any suggestions?
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Best solution

a c 115 U Graphics card
August 24, 2012 6:56:26 AM

Frisbee_68 said:
Ok. So then I have to get a new motherboard...but the PRO, Deluxe, and EVO are all discontinued and the WS is $250...any suggestions?


http://www.newegg.com/Product/Product.aspx?Item=N82E168...
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August 24, 2012 6:57:10 AM

if i get this motherboard would i need to reinstall everything i have
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a c 115 U Graphics card
August 24, 2012 7:11:04 AM

Frisbee_68 said:
if i get this motherboard would i need to reinstall everything i have


Probably not, but it might be a good idea as it is a different chipset
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August 24, 2012 7:14:18 AM

so any motherboard with only a blue and a black pcie slot is not sli compatible?
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a c 115 U Graphics card
August 24, 2012 7:27:44 AM

Frisbee_68 said:
so any motherboard with only a blue and a black pcie slot is not sli compatible?


Probably not. The black slot on the bottom of the board is tied to the PCH (formerly called the Southbridge) which is the IO part of the Intel chipset. It only runs at PCIe 4x despite having a full slot size. The blue slots are tied to the CPU directly. Communication between a black and blue slot would require that the data make an additional bus hop as it would have to go through the DMI bus that connects the CPU and PCH.

The black slot also shares PCIe bandwidth with a couple of add-in controllers such as the USB 3.0 controller and additional SATA-III ports.

There is no technical reason why it can't be done, because this is exactly how NVidia used to do it when they produced chipsets themselves. When NVidia first introduced 3 way SLI with the NForce 700 series chipset two of the GPUs would be connected to the Northbridge and one would be connected to the southbridge.

I suspect that NVidia may not want SLI implemented in this fashion anymore due to the bandwidth issues that can arise, especially when a GPU ends up sharing bandwidth in a low bandwidth slot.
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August 24, 2012 10:02:33 AM

Best answer selected by Frisbee_68.
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August 24, 2012 10:03:00 AM

thanks. new motherboard is ordered and should be here within a week. hopefully it works well
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