SLI?

[Arctucas]

Why do I get worse scores in FurMark and MSI Kombustor when SLI is enabled than when disabled?

[JeGX]

Have you enabled the PostFX ?

[Arctucas]

Two eVGA GTX460 SC EE.

With PostFX enabled in FurMark, it hangs the system when it reaches 99%, both with SLI enabled and disabled.

Therefore, I cannot upload a score, but I recorded the following:

Single GPU FPS-Min=60 Max=107 Avg=75

SLI FPS-Min=52 Max=108 Avg=75

I am no expert, but should not SLI give better scores than a single GPU?

Kombustor single GPU
 

Kombustor SLI
 

[JeGX]

Yes of course, SLI is faster than single card except for NVIDIA cards when post processing is used (and this not limited to FurMark or Kombustor, I read in some forums the same kind of problem with games).

Disable the PostFX and you should have the SLI score greater than the single card score.

[Arctucas]

Yes of course, SLI is faster than single card except for NVIDIA cards when post processing is used (and this not limited to FurMark or Kombustor, I read in some forums the same kind of problem with games).

Disable the PostFX and you should have the SLI score greater than the single card score.

Thank you for the reply.

I also would have believed that to be the case.

However, the following screenshots appear to prove otherwise.

Single GPU



SLI



I truly appreciate any assistance you may provide that will help to determine why a single GPU gives a higher score than an SLI configuration.

[JeGX]

Yes your SLI in not used because of NVIDIA SLI profile settings that suck. And I don't know why but I added in Kombustor a copy of Kombustor.exe renamed in Heaven.exe for SLI and Crossfire. But actually Heaven.exe doesn't work as expected for NVIDIA SLI. The solution: the good old FurMark trick: rename Kombustor.exe in etqw.exe. And you'll see both GPUs working like a charm!

[Arctucas]

I hope I am doing this right, I renamed MSIKombustorDX11.exe to etqw.exe.

But, it seems not to have worked:



What other options do I have?

Thank you.

[Arctucas]

@JeGX,

I decided to try the "Heaven.exe" from the Kombustor folder. It seems to work much better for SLI:



Single GPU stays the same:



I believe that sorts it out, thanks for your patience.

[JeGX]

Yep I didn't see you were using the D3D11 path. For OpenGL path, the etqw.exe trick works fine and for D3D path, Heaven.exe is the trick. Thanks NVIDIA to make our life so easy