2 grafic card, but only one works?

[ixeronnovaro]

I have two NVIDIA GeForce GTX 1080 grafic cards. but for some reason only one of them is working? both seem to work if i look in the pc since the lamps on both glow but if i try to use them only one of them shows up[if i go into the nvidia controls or if i look into the pc specs-> grafic cards.].

 

[Barty1884]

What are you attempting to use them for? Do you have them connected with an SLI bridge?

Please post your full system spec, including motherboard & PSU models.

 

[ixeronnovaro]

What are you attempting to use them for? Do you have them connected with an SLI bridge?

Please post your full system spec, including motherboard & PSU models.

i dont know what a SLI bridge, motherboard or PSU model is. i really dont know much about computers.
i can only look into the device-manager. but there is a lot of things and i dont know what is relevant.

 

[Barty1884]

What are you trying to use the 2x 1080's for?

To be configured for gaming, for example, then you'll need an SLI bridge to have them "seen".
https://www.geforce.com/hardware/technology/sli/bridges

Currently, your secondary card is just essentially getting power, unless you have a workload that can utilize them independently.

 

[shknawe]

look on eBay for a sli bridge for Gtx 1080, should be around,60-100 us. It connects the two cards together. You have to "bridge" them so they work as a pair. If you intended to overclock them they have to be the same brand.

 

[TJ Hooker]

If you don't know what motherboard or PSU you have, I'm assuming you bought a prebuilt PC? If so, what exact model is it?

 

[ixeronnovaro]

What are you trying to use the 2x 1080's for?

To be configured for gaming, for example, then you'll need an SLI bridge to have them "seen".
https://www.geforce.com/hardware/technology/sli/bridges

Currently, your secondary card is just essentially getting power, unless you have a workload that can utilize them independently.

i dont think i have a SLI bridge is it necessary to have one? i also dont know if two cards are necessary to run everything i play on highest settings.

If you don't know what motherboard or PSU you have, I'm assuming you bought a prebuilt PC? If so, what exact model is it?

i bought the pc over a year ago on hitech-gamer.com but i cant find the specific one anymore.

 

[TJ Hooker]

Yes, you need an SLI bridge to use both cards together in gaming. What games do you play, what resolution/refresh rate is your monitor?

If you can't tell us your specs, we can't tell you if your motherboard/CPU will support SLI even with a bridge. Download hwinfo64, and when you run it select the "summary" option.

Next time it may be better to do a few minutes of research before dropping $500+ on a graphics card...

 

[ixeronnovaro]

Yes, you need an SLI bridge to use both cards together in gaming. What games do you play, what resolution/refresh rate is your monitor?

If you can't tell us your specs, we can't tell you if your motherboard/CPU will support SLI even with a bridge.

Next time it may be better to do a few minutes of research before dropping $500+ on a graphics card...

i mostly play overwatch[semi pro in midmasters.] fps 144[since 144hz monitor] resolution 1920x1080.
if you tell me which segments the device manager shows you need to know then i could tell you.
i didnt bought the card solo. the pc had two as i bought it.

 

[faalin]

You need to figure out what motherboard you have, download CPUz and click on the motherboard tab at the top it will tell you make and model. It very well could be that you dont have two PCI-e x8 slots. It could be a x16/x4 which SLI will not work on.

https://www.cpuid.com/softwares/cpu-z.html

 

[ixeronnovaro]

CPU: Intel Core i7 5820K
Mainboard: MSI X99A MPOWER [MS-7885]
Memory: DDR4 32 GB

what else do you need to know?

 

[TJ Hooker]

Wait, so you bought a PC with two graphics cards over a year ago, and the 2nd graphics card hasn't worked the entire time, and you're only doing something about it now??

I don't know if it's worth asking, but do you know how long the warranty is?

If the PC came with two graphics cards, I would assume the mobo/CPU support SLI and it has a bridge included, but best to make sure. Check your specs using hwinfo64 or CPU-Z, and suggested.

Edit: OK, based on those specs SLI should work just fine. You may need to open up your PC and verify that an SLI bridge is installed. It may also be good to check which PCIe slots the two cards are installed in.

Edit2: You probably don't even need the 2nd GTX 1080 for 1080p/144 Hz gaming, but might as well get it working if you have it.

 

[ixeronnovaro]

Wait, so you bought a PC with two graphics cards over a year ago, and the 2nd graphics card hasn't worked the entire time, and you're only doing something about it now??

I don't know if it's worth asking, but do you know how long the warranty is?

If the PC came with two graphics cards, I would assume the mobo/CPU support SLI and it has a bridge included, but best to make sure. Check your specs using hwinfo64 or CPU-Z, and suggested.

i never noticed it earlier. and i dont know if i have a SLI-bridge there is something on the cards but it doesnt look like it does on the nvidia site. [couldnt get a better picture with my phone...] https://cdn.discordapp.com/attachments/375967118245756939/469183318618013702/20180718_184646.jpg
i just installed CPU-Z. i only need to know which things are necessary to know for you.

 

[faalin]

The 1080's need to be installed on the top two PCI-e slots, since your CPU only has 28 lanes it runs in a x16/x8/x0/x0 config with 2 cards installed.

Looks like both cards are next to each other. have you made sure in Nvidia control panel you have both cards and checked for SLI, something like this.

 

[ixeronnovaro]

The 1080's need to be installed on the top two PCI-e slots, since your CPU only has 28 lanes it runs in a x16/x8/x0/x0 config with 2 cards installed.

where do i see the PCI-e slots in CPU-Z and how do i change them if they are wrong?

 

[faalin]

this is your motherboard, your cards should be in the slots with the yellow arrows next to them

 

[ixeronnovaro]

this is your motherboard, your cards should be in the slots with the yellow arrows next to them

i dont see the second card in nvidia controls

and the motherboard doesnt seem to have more than the two spots where the cards are in.

 

[faalin]

Can you post a screen shot of your device manager of both card in there? Next i would say go over to Nvidia and download and install the latest drivers for the cards.

 

[ixeronnovaro]

Can you post a screen shot of your device manager of both card in there? Next i would say go over to Nvidia and download and install the latest drivers for the cards.

the divice manager only shows one card.
downloading the driver update rn.

 

[faalin]

ok so the lower card is not working at all if its not showing in device manager. Turn your computer off, unplug the power, and hold the power button down for a few second to drain all the power out of the system. Remove both cards and install the lower card in the top card's slot, this will test to see if the card is still good.

If the second card works in the first slot the install both cards in the slots that have red arrows on them. if they both show up in these slots then you will have to buy a longer sli cable to span the bigger gap

 

[ixeronnovaro]

ok so the lower card is not working at all if its not showing in device manager. Turn your computer off, unplug the power, and hold the power button down for a few second to drain all the power out of the system. Remove both cards and install the lower card in the top card's slot, this will test to see if the card is still good.

If the second card works in the first slot the install both cards in the slots that have red arrows on them. if they both show up in these slots then you will have to buy a longer sli cable to span the bigger gap

thanks alot for the help. i will do that as soon as possible but i cant do that the next few days since i participate in a tournament the next days and need the pc to be okay. i will message again after i tried that.