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Display not coming from Primary GPU in SLI set up

Wayne Tai
By Wayne Tai
in Graphics Cards
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Go to solution Solved by Mick Naughty,

So use ddu with the system up like normal. Then take out the bottom card and plug the monitor in the top card and start up like normal. 

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I encountered a strange problem after upgrading to Asus GTX 1080 ROG strix recently.. 

 

Since I installed the cards on my Asus X99-A motherboard, the display is coming from the bottom PCIE x8 slot instead of the default x16 slot (the one closer to the CPU)

 

It doesn't matter if I switch the cards,  the display would still come from x8 slot instead of x16. 

 

Is there a way to fix this? I am okay with having the x8 slot as the primary GPU but I just can't figure out why that is the case.. 

Mobo: ASUS X99-A  // CPU: i7-5820k // GPU: ASUS GTX 1080 ROG Strix //  Ram: 4 x 4 GB 2666 Mhz G.Skill Ripjaw // SSD: Samsung 960 Pro 512GB NVMe //  PSU: Cooler Master V850  // Case: Corsair 760T Arch White // Mouse: Logitec G903 Lightspeed // Keyboard: Logitech G Pro // Headphones: Audio Technica Ath-R70x // Monitor: BenQ BL2710PT

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So if you plug the monitor in the top card, then start the pc you don't get anything? Not

even the bios?

Main RIg Corsair Air 540, I7 9900k, ASUS ROG Maximus XI Hero, G.Skill Ripjaws 3600 32GB, 3090FE, EVGA 1000G5, Acer Nitro XZ3 2560 x 1440@240hz 

 

Spare RIg Lian Li O11 AIR MINI, I7 4790K, Asus Maximus VI Extreme, G.Skill Ares 2400 32Gb, EVGA 1080ti, 1080sc 1070sc & 1060 SSC, EVGA 850GA, Acer KG251Q 1920x1080@240hz

 

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1 hour ago, Mick Naughty said:

So if you plug the monitor in the top card, then start the pc you don't get anything? Not

even the bios?

It's black screen after BIOS.. I tried with single card and the issue persist. If there PCIE slot is faulty, I should not be able to play games in SLI. This is weird.. 

Mobo: ASUS X99-A  // CPU: i7-5820k // GPU: ASUS GTX 1080 ROG Strix //  Ram: 4 x 4 GB 2666 Mhz G.Skill Ripjaw // SSD: Samsung 960 Pro 512GB NVMe //  PSU: Cooler Master V850  // Case: Corsair 760T Arch White // Mouse: Logitec G903 Lightspeed // Keyboard: Logitech G Pro // Headphones: Audio Technica Ath-R70x // Monitor: BenQ BL2710PT

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So use ddu with the system up like normal. Then take out the bottom card and plug the monitor in the top card and start up like normal. 

Main RIg Corsair Air 540, I7 9900k, ASUS ROG Maximus XI Hero, G.Skill Ripjaws 3600 32GB, 3090FE, EVGA 1000G5, Acer Nitro XZ3 2560 x 1440@240hz 

 

Spare RIg Lian Li O11 AIR MINI, I7 4790K, Asus Maximus VI Extreme, G.Skill Ares 2400 32Gb, EVGA 1080ti, 1080sc 1070sc & 1060 SSC, EVGA 850GA, Acer KG251Q 1920x1080@240hz

 

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On 5/31/2017 at 0:24 AM, Mick Naughty said:

So use ddu with the system up like normal. Then take out the bottom card and plug the monitor in the top card and start up like normal. 

I put 2 cards back, enabled SLI, disable SLI again and then charge the display port connector to the top card. Now it's working.. thanks for your reply though.

Mobo: ASUS X99-A  // CPU: i7-5820k // GPU: ASUS GTX 1080 ROG Strix //  Ram: 4 x 4 GB 2666 Mhz G.Skill Ripjaw // SSD: Samsung 960 Pro 512GB NVMe //  PSU: Cooler Master V850  // Case: Corsair 760T Arch White // Mouse: Logitec G903 Lightspeed // Keyboard: Logitech G Pro // Headphones: Audio Technica Ath-R70x // Monitor: BenQ BL2710PT

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