Setting up Sli

[jimbop]

Thanks. Single card is fine with no stuttering and acceptable framerate (e.g. http://forum.1cpublishing.eu/showthread.php?t=25940). I was just wondering if SLI was still 'working' post patch.

[RickRuski]

Hi Jimbob,

Could you post a copy of your profile in Inspector and your Nvidia CP settings. If you are not seeing any improvement in fps have you got v/s enabled? if so fps won't show any higher than your refresh rate. I have had a look at what I am using at the moment in the profile and there is only one change that I have made from the one posted, I will change the profile to reflect the change. It seems to have made a very small improvement for me anyway.

Cheers

Rick

[jimbop]

Originally Posted by RickRuski

Hi Jimbob,

Could you post a copy of your profile in Inspector and your Nvidia CP settings. If you are not seeing any improvement in fps have you got v/s enabled? if so fps won't show any higher than your refresh rate. I have had a look at what I am using at the moment in the profile and there is only one change that I have made from the one posted, I will change the profile to reflect the change. It seems to have made a very small improvement for me anyway.

Cheers

Rick

See end of post for the profile. I usually play with vsync enabled to reduce tearing but not during testing. This is on a clean 285.62 install. The only thing that is not as per your original post is the Sli compatibility bits since CoD is not found in my installation and 0x00000011 refers to a Star Wars game instead. As mentioned above the cards are both working according to EVGA Precision.

These results are for a 30 second average of the same track under SLI and single GPU. The average framerate is higher (14% higher under these conditions) but the stutters and sudden slowdowns make this unplayable for me regardless. This is reflected in the variable minimum framerate in SLI below vs the very stable results for single GPU:



And the video options were:



I will continue to play around with it to see if the stutters can be reduced.

[jimbop]

Update: tinkering with settings can improve framerates somewhat but stutters are inevitable when SLI is enabled, at least on my system. Is anyone managing to get framerate increases without stutters on 285.62?

[RickRuski]

Hi Jimbop,

I have just updated to the latest Beta Nvidia drivers and find very little difference for me from the previous version. What I asked you for was your personal settings in "Inspector" and "Nvidia Control Panel" not your fps and ingame video settings, I wanted to have a look at what exactly you are using so that I might help you get it working more to your liking. Without that information I'm only guessing at where to start for you.
I'm running 2x gts450 Sli and have very playable frame rates with minor stutters low down over land but not bad enough to stop me enjoying the sim. It sounds like you haven't added "Launcher.exe" to your Control panel settings to match the Inspector profile, these are what I need to see to be able to help. If you are not sure how to do this ask for help, I will be very happy to. I know that the "Compatibility bits" setting refers to a Star wars setting but a lot of settings refer to multiple games. If you don't wish to try all suggested settings, then experiment with the settings yourself to try and get the best that you can. I am running all my in game video settings on High except for Building amount and Forests which are both medium, my resolution is 1280 x 960 on a 19" lcd, roads "on", Shadows "off" (find that is a big hit on fps) 2 x AA, V/S "off". Don't have any noticeable tearing, have tried it both ways and find "off" suits me better.

One thing to have a look at, in the Nvidia control panel when you set it up for Sli (I suppose you have) under the Physics settings make sure that you have CPU selected other wise one of your cards will be allocated for Physics use.

Your 2 x GTX480's should eat this sim.

Cheers

Rick

[jimbop]

Originally Posted by RickRuski

Hi Jimbop,

I have just updated to the latest Beta Nvidia drivers and find very little difference for me from the previous version. What I asked you for was your personal settings in "Inspector" and "Nvidia Control Panel" not your fps and ingame video settings, I wanted to have a look at what exactly you are using so that I might help you get it working more to your liking. Without that information I'm only guessing at where to start for you.
I'm running 2x gts450 Sli and have very playable frame rates with minor stutters low down over land but not bad enough to stop me enjoying the sim. It sounds like you haven't added "Launcher.exe" to your Control panel settings to match the Inspector profile, these are what I need to see to be able to help. If you are not sure how to do this ask for help, I will be very happy to. I know that the "Compatibility bits" setting refers to a Star wars setting but a lot of settings refer to multiple games. If you don't wish to try all suggested settings, then experiment with the settings yourself to try and get the best that you can. I am running all my in game video settings on High except for Building amount and Forests which are both medium, my resolution is 1280 x 960 on a 19" lcd, roads "on", Shadows "off" (find that is a big hit on fps) 2 x AA, V/S "off". Don't have any noticeable tearing, have tried it both ways and find "off" suits me better.

One thing to have a look at, in the Nvidia control panel when you set it up for Sli (I suppose you have) under the Physics settings make sure that you have CPU selected other wise one of your cards will be allocated for Physics use.

Your 2 x GTX480's should eat this sim.

Cheers

Rick

RickRuski, the reason I did not include my Inspector profile settings (I assume this is what you mean by 'personal settings') is that they are exactly as per your post #1 with only your recommendations changed from the default settings. I would just be copy/pasting your post #1 settings. Let me know if this is not adequate and, if not, what you would prefer.

Yes, I have pointed the profile to launcher.exe in both Inspector and then NVIDIA Control Panel. The cards are running at identical clocks etc.

The point of the screenshots was to demonstrate that SLI was working to some extent but certainly not doubling the framerate. SLI causes annoying stutters / sudden framerate drops (call it what you will) compared with single GPU.

[RickRuski]

Hi Jimbop and all,

I was hoping to upload to file factory a copy of my settings in inspector but at this stage I can't get it to copy correctly. Until I can sort the problem the file has been deleted.

Update: - link fixed see original post page one

Cheers

Rick