marcusdgarcia
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Recently purchased 2 EVGA 780 6GB cards for SLI, both cards work individually but are not recognized together. All equipment is under 4 months old.
Motherboard - Asus Maximus VI Formula - Purchased in March
Processor - Intel i7 4770k - Purchased in March
PSU - EVGA 1300W - Purchase Last week
Graphics Cards - EVGA 780 6GB x 2 - Purchased Last Week
PCIE Hard Drive - Asus RAIDR 240GB - Purchase in March
Operating System - Windows 7 Ultimate - Installed in March
I have tried the below each test I installed a clean version of nvidia software
Cards are currently installed in top two PCIe Slots as Required by manual
Tried swapping locations on all of the slots and variations each time
Tried 2 different PSU's same model EVGA 1300w
Tried multiple sets of VGA power cables
Tried 3 different Asus SLI bridges all varying in length
Removed each card and tested individually running bench tests on both and getting same results and FPS on both.
Verified with Asus that the board does not have anything in BIOS to enable
My next thoughts would be to format both my hard drives and start with a fresh install and/or trying a different motherboard.
I also saw that hypersli might work just to tell me if there was a motherboard problem but am unsure on where to get the download for hypersli and how safe it is.
Anyone else have any ideas on what is blocking me from enabling the SLI?
Thanks,
Marcus
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HeavyHemi
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Re: No option for SLI in Nvidia Control Panel EVGA 780 6GB
2014/07/24 12:05:42
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marcusdgarcia
Recently purchased 2 EVGA 780 6GB cards for SLI, both cards work individually but are not recognized together. All equipment is under 4 months old.
Motherboard - Asus Maximus VI Formula - Purchased in March
Processor - Intel i7 4770k - Purchased in March
PSU - EVGA 1300W - Purchase Last week
Graphics Cards - EVGA 780 6GB x 2 - Purchased Last Week
PCIE Hard Drive - Asus RAIDR 240GB - Purchase in March
Operating System - Windows 7 Ultimate - Installed in March
I have tried the below each test I installed a clean version of nvidia software
Cards are currently installed in top two PCIe Slots as Required by manual
Tried swapping locations on all of the slots and variations each time
Tried 2 different PSU's same model EVGA 1300w
Tried multiple sets of VGA power cables
Tried 3 different Asus SLI bridges all varying in length
Removed each card and tested individually running bench tests on both and getting same results and FPS on both.
Verified with Asus that the board does not have anything in BIOS to enable
My next thoughts would be to format both my hard drives and start with a fresh install and/or trying a different motherboard.
I also saw that hypersli might work just to tell me if there was a motherboard problem but am unsure on where to get the download for hypersli and how safe it is.
Anyone else have any ideas on what is blocking me from enabling the SLI?
Thanks,
Marcus
Are you only using two PCIe slots on your motherboard for the GPUs? I see you have a PCIe hard drive listed. If you're using all 3 x16 PCIe slots you're running at x8/x4/x4 which will NOT work in for SLI. Both PCIe slots must be running at a minimum of x8 meaning you can only use two of your x16 PCIe slots if you want to run SLI.
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bob16314
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Re: No option for SLI in Nvidia Control Panel EVGA 780 6GB
2014/07/24 12:46:02
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This ^^^^
Your PCIe Hard Drive is causing the two bottom PCIe x16 slots to drop to x4 mode (and the top slot to drop to x8 mode) which will not allow SLI..SLI needs x8 minimum to work..You can't populate all 3 PCIe x16 slots and run SLI..You need to free up an x16 slot..Since that Asus RAIDR 240GB has a PCIe x2 interface and your mobo has three x1 slots (it won't work in them) besides the three x16 slots, your only options are to lose the Asus RAIDR 240GB that you have in an x16 slot, or don't run SLI..Sorry to say.
Welcome to the forums btw.
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NordicJedi
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Re: No option for SLI in Nvidia Control Panel EVGA 780 6GB
2014/07/24 13:48:26
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As mentioned above, it's likely that a populated third PCI-e x16 slot drops the second x16 slot to 4x. The CPU only has 16 lanes on the PCI-Express bus, and it doesn't seem like this board adds any additional lanes, forcing the second PCI-e x16 slot to downgrade to x4 if the third slot has something in it.
Try testing without the SSD in, if you can. Otherwise you'll probably find that you need another motherboard with additional lanes to run all three.
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ty_ger07
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Re: No option for SLI in Nvidia Control Panel EVGA 780 6GB
2014/07/24 13:58:49
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I don't understand why SLI needs a minimum of x8. The SLI connector does all the inter-card synching and texture streaming. In my opinion, NVIDIA should allow x4 to support SLI for those in the position that would rather have bad SLI performance rather than no SLI. But, I guess that is NVIDIA's decision.
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bob16314
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Re: No option for SLI in Nvidia Control Panel EVGA 780 6GB
2014/07/24 14:12:14
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ty_ger07
I don't understand why SLI needs a minimum of x8. The SLI connector does all the inter-card synching and texture streaming. In my opinion, NVIDIA should allow x4 to support SLI for those in the position that would rather have bad SLI performance rather than no SLI. But, I guess that is NVIDIA's decision.
Agreed..CrossFire can happen at x4, but not SLI, nope.
* Corsair Obsidian 450D Mid-Tower - Airflow Edition * ASUS ROG Maximus X Hero (Wi-Fi AC) * Intel i7-8700K @ 5.0 GHz * 16GB G.SKILL Trident Z 4133MHz * Sabrent Rocket 1TB M.2 SSD * WD Black 500 GB HDD * Seasonic M12 II 750W * Corsair H115i Elite Capellix 280mm * EVGA GTX 760 SC * Win7 Home/Win10 Home * "Whatever it takes, as long as it works" - Me
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NordicJedi
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Re: No option for SLI in Nvidia Control Panel EVGA 780 6GB
2014/07/24 14:31:53
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ty_ger07
I don't understand why SLI needs a minimum of x8. The SLI connector does all the inter-card synching and texture streaming. In my opinion, NVIDIA should allow x4 to support SLI for those in the position that would rather have bad SLI performance rather than no SLI. But, I guess that is NVIDIA's decision.
Nvidia may have chosen to prefer good SLI or no SLI rather than poor SLI. Another possibility is that internal testing showed problems or driver instability with those bandwidths. While they would likely sell more cards for SLI if x4 would work, perhaps Nvidia considers it just as important for people to see SLI performance while using better motherboards or systems that have a higher average level of performance. It would affect card sales in the short term, but happy customers forced to use the proper system may end up being repeat buyers because everything worked well together in the long-run. It wouldn't be unlike game developers/publishers insisting on minimum specs higher than what is actually need to play the game to ensure there are fewer performance complaints. We know it certainly hasn't hurt Nvidia's sales over the long run, compared to AMD, so I don't see a reason why Nvidia would revisit the policy.
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marcusdgarcia
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Re: No option for SLI in Nvidia Control Panel EVGA 780 6GB
2014/07/24 15:34:54
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Thank you all for the quick responses wasnt expecting an answer so far, is there another board that can utilize the PCIe SSD and SLI?
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EVGA_JacobF
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Re: No option for SLI in Nvidia Control Panel EVGA 780 6GB
2014/07/24 16:23:54
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What driver version are you using?
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marcusdgarcia
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Re: No option for SLI in Nvidia Control Panel EVGA 780 6GB
2014/07/24 16:37:01
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_NathanF
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Re: No option for SLI in Nvidia Control Panel EVGA 780 6GB
2014/07/24 16:43:28
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Have you tried clean driver install under safe mode ?
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trabe3
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Re: No option for SLI in Nvidia Control Panel EVGA 780 6GB
2014/07/24 18:51:03
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Maximus VI Extreme should work as it has one more PCI-e slot.
System #1 ASUS RIV BE 4930K 4.5GHz - Kraken X60 push/pull 16Gb Corsair Dominator Platinum 2133MHz EVGA 780 Classified SLI - Pro SLI Bridge Corsair AX1200i Windows 7 Pro NZXT Switch 810 ASUS PB287Q 4K System #2 3930K @ 4.4GHz 8Gb 1600Mhz XFX R9 270X (for now)
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RDKing2
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Re: No option for SLI in Nvidia Control Panel EVGA 780 6GB
2014/07/24 23:30:52
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Several of the Asrock z87 and z97 boards will accomplish what you want. The OC Formulas, Extreme 9's and the Extreme 6's.
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marcusdgarcia
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Re: No option for SLI in Nvidia Control Panel EVGA 780 6GB
2014/07/25 04:02:26
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Thank you guys for all your help it looks like they fixed this issue in the maximus VII formula
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