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Problems getting 2 EVGA 660 SC in SLI with Asus 990fx mobo

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October 25, 2013 11:26:31 AM

Hello, I had a couple questions regarding an SLI setup. I have looked all over the web and haven't found a fix yet so I thought I'd ask here. I recently just purchased a second EVGA 660 SC so that I could have 2 graphics cards in SLI. Both cards have the same video ram, work, and my desktop registers both of them. However, when I go into the Nvidia Control Panel, I do not have the option to set them in SLI. I have looked online all day yesterday looking for a fix and nothing worked. I have some guesses, but I thought I'd ask since I'm not that experienced with computers.

1. I have an Asus Sabertooth 990FX motherboard with my first GPU in the top PCIE slot. I wanted to put my second card in the next PCIE slot with the same color, but there is a PCI slot that is elevated right below it, so it blocks my card before it is even set into the mobo. Will my graphics card have to be in that PCIE slot with the same color for SLI to be enabled?

2. I currently put my second graphics card into a different PCIE slot that is not of the same color. These slots are PCIE 2.0x16 slots. I was under the impression that I would be able to enable SLI even if the slots were different colors and that performance was the only thing affected.

3. I have downloaded GPU-Z on my desktop, and both cards are essentially the same except for the section labled bus interface. One was PCI-E 2.0 x 16 @ x16.1.1 if I remember correctly, I am not currently home and am making this post from my laptop. The other was PCI-E 2.0 x 16 @ 4 1.1. The x16 and x4 values correspond with what my mobo manual says regarding the PCI-E slots.

4. I'm not really interested in just selling my cards and getting a better single GPU. I have seen that there would generally be no problems if I was to only have a single GPU, but I know that I would want to have multiple graphics cards anyways so I wanted to get accustomed to them now.

Any information provided would be appreciated.

Setup:
AMD FX-8120 Zambezi (mobo autoclocked it near 4.0 GHz)
Asus Sabertooth 990FX R2.0
2 X 2.0GB EVGA 660 SC
2 X Corsair Vengeance 4 GB 1866
Corsair HX750 PSU
Rosewill N900PCE Wireless N Dual Band PCI Express Adapter
Seagate Momentus XT 750GB 7200 RPM Hybrid Drive
a b U Graphics card
October 25, 2013 12:54:02 PM

Your biggest problem your, AMD chipset does not support SLI. Crossfire only. You need 2 AMD GPUs.
October 25, 2013 1:00:14 PM

So the only way to get two graphics cards into my system would be to either change out the motherboard and processor or to get the two AMD GPUs? Since the motherboard came with an SLI bridge I didn't think twice about it.
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a b U Graphics card
October 25, 2013 1:05:05 PM
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Pandarocious said:
So the only way to get two graphics cards into my system would be to either change out the motherboard and processor or to get the two AMD GPUs? Since the motherboard came with an SLI bridge I didn't think twice about it.

I am wrong, this chipset does support sli, but you must have the cards in correct slots. Hang on, I am researching right now.
October 25, 2013 1:09:28 PM

I appreciate the help. It was the slots that was getting me thinking as well. Originally, I wanted to put the second 660 in the third PCIEx16 slot, or the 4th slot down the motherboard, but the card is physically blocked by the PCI slot below it, as the PCI slot itself is higher than the other PCIE slots.
October 26, 2013 1:43:36 AM

Sorry about this jitpublisher, but I no longer need help. Turns out that I was just failing massively when it came to putting my second GPU in. I swapped the GPU into the PCIEx16 slot I was originally trying to put it into, and I just didn't have it set properly the first time. That's what led me to believe that the PCI slot's different height was affecting the card. I do appreciate your help and I will select your reply regarding swapping the slots that it was in as the answer. Thanks for the help.
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