Multiple GPUs setup,but the second GPU running at pcie 1X !!

[AsadAlrafidain]

Hi, this is my first post here.
I have 2 gpus (1070ti , gtx 970) so I stumbled upon few articles and videos regarding DX12 Explicit multi-adapter rendering, which make use of multiple GPUs that don't have to be the same model (unlike SLI)....so I thought I should make use of my second gpu (GTX 970) and installed it on the second PCIE slot (Motherboard manual states that the second slot is 8X, while the 1st is 16X both version 3.0).....now GPU-z states that my 1st GPU is running at 8X v 3.0, which is understandable given the multiple GPUs situation and they have to share PCIE lanes

what puzzles me is that GPU-z states that my second GPU (gtx 970) is runing at PCIE x1 V 3.0 , and it even switch to v. 1.1

What could be the cause ? I tried forcing PCIE link speed to gen 3 in bios, prefering maximum performance in Nvidia control panel, even forcing kboost mode in afterburner but nothing changes


My specs:
MB: Gigabyte gaming 5
CPU : intel i5 6600
Ram : 16 GB
PSU: 650 w
GPU1: GTX 1070ti
GPU2: GTX 970

Windows 10 X64

 

[AsadAlrafidain]

edit: tried reseating the gtx 970....now gpu-z reports that it is running at x8 v3.0 but it drops to v1.1 after few seconds...tried running the render test of gpu-z but it stays at 1.1

 

[pavle]

Dropping to PCI-express 1.1 is normal behaviour for idle state of the card. Run render test in GPU-Z (or more demanding graphics program) and it will go up to 3.0.

 

[eidairaman1]

edit: tried reseating the gtx 970....now gpu-z reports that it is running at x8 v3.0 but it drops to v1.1 after few seconds...tried running the render test of gpu-z but it stays at 1.1

Driver conflict

 

[Toothless]

Driver conflict

970 should be fine running the same drivers as the others. Kepler was taken off.


@AsadAlrafidain MGPU is not worth it. Your 970 will not add any actual performance and that DX12 needs to be enabled by the devs. There is like, two games that support it. Not worth.

 

[AsadAlrafidain]

Dropping to PCI-express 1.1 is normal behaviour for idle state of the card. Run render test in GPU-Z (or more demanding graphics program) and it will go up to 3.0.

Even when I run the test it stays at 1.1

970 should be fine running the same drivers as the others. Kepler was taken off.


@AsadAlrafidain MGPU is not worth it. Your 970 will not add any actual performance and that DX12 needs to be enabled by the devs. There is like, two games that support it. Not worth.

I'm starting to think this way too.... I was hopeful that i get to use my trusty GTX 970 one more time...I'll run some benchmarks before giving up the idea

 

[AsadAlrafidain]

Driver conflict

Driver conflict

you mean ncidia drivers or gpu-z version ?

 

[Toothless]

Even when I run the test it stays at 1.1


I'm starting to think this way too.... I was hopeful that i get to use my trusty GTX 970 one more time...I'll run some benchmarks before giving up the idea

Ashes of the Singularity does the multigpu thing, but unless that's all you play you might as well have say, a spare desktop or nice little mount to show it off.

 

[eidairaman1]

you mean ncidia drivers or gpu-z version ?

Yes ngreedia

And gpu-z is not a driver, it is a gpu bios reading tool.

 

[pavle]

Even when I run the test it stays at 1.1

It shows 3.0 in your second GPU-Z screenshot. Maybe it's just not big enough of a load that GPU-Z Rendertest. Try some other windowed 3d applications and see how high it goes.

 

[AsadAlrafidain]

It shows 3.0 in your second GPU-Z screenshot. Maybe it's just not big enough of a load that GPU-Z Rendertest. Try some other windowed 3d applications and see how high it goes.

it seems you are right...once launched ashes of the singularity in windowed mode ,then launched gpu-z, now it reads x8 gen 3.0....only thing left for me is to figure out does this setup benefit me more or running a single gpu (1070ti) on pcie x16....
another thing that piqued my interest is in Nvidia Control panel / physx section....it seems i can dedicate the 970 for physx....now i don't now if this benefit or hurt performance, or if modern games use physx at all

 

[eidairaman1]

it seems you are right...once launched ashes of the singularity in windowed mode ,then launched gpu-z, now it reads x8 gen 3.0....only thing left for me is to figure out does this setup benefit me more or running a single gpu (1070ti) on pcie x16....
another thing that piqued my interest is in Nvidia Control panel / physx section....it seems i can dedicate the 970 for physx....now i don't now if this benefit or hurt performance, or if modern games use physx at all

Contact nvidia for this problem, their drivers aren't handling things correctly.

 

[Toothless]

it seems you are right...once launched ashes of the singularity in windowed mode ,then launched gpu-z, now it reads x8 gen 3.0....only thing left for me is to figure out does this setup benefit me more or running a single gpu (1070ti) on pcie x16....
another thing that piqued my interest is in Nvidia Control panel / physx section....it seems i can dedicate the 970 for physx....now i don't now if this benefit or hurt performance, or if modern games use physx at all

It will hurt. I tried 1080ti/1060 physX and 1080ti/Titan X Maxwell. Both hurt so badly that I just abandoned it.

 

[eidairaman1]

It will hurt. I tried 1080ti/1060 physX and 1080ti/Titan X Maxwell. Both hurt so badly that I just abandoned it.

Yup physx just like sli are vapor/shovelware

 

[AsadAlrafidain]

@pavle @Toothless @eidairaman1 Thank you guys for your valuable inputs on the subject

 

[Toothless]

Yup physx just like sli are vapor/shovelware

PhysX worked great a long time ago with a dedicated card. Ran a 660+650 and man did that work nicely. I'm just guessing support as of late is lacking.

 

[eidairaman1]

PhysX worked great a long time ago with a dedicated card. Ran a 660+650 and man did that work nicely. I'm just guessing support as of late is lacking.

You never hear it being pushed, like sli, dead dead.

 

[R-T-B]

PhysX isn't dead. It's actually used in more games than any other physics API. On CPU, which works on both platforms.

The GPU version of it however seems to be very dead.