Setting up Sli

[jimbop]

Hi guys, I'm using 285.62 WHQL 64-bit with two GTX480s. Your suggested profile results in everything being mirrored between the two cards in Precision (GPU memory, temp, usage but only at abut 50%) but no increase in frame rates and stuttering which I don't usually get.

Also, IL-2 doesn't appear in the Inspector list now. Do you know if there have been some changes in 285.62 that stop your profile increasing FPS or am I doing something wrong? Thanks.

[KeBrAnTo]

Just tried Rick's settings and didn't work for me first time, only one GPU was doing the job.

I found out I had to enable another two options further down the list in nVidia inspector, and now SLI is working for me, both cards at 99%, temp at 80-81º and 50 fps average at 1680x1050 and medium settings ingame, very good

[KeBrAnTo]

Originally Posted by jimbop

Also, IL-2 doesn't appear in the Inspector list now. Do you know if there have been some changes in 285.62 that stop your profile increasing FPS or am I doing something wrong? Thanks.

It doesn't show up actually. You have to manually create your own "launcher.exe" profile and check if SLI is really working using a tool such e-vga precision.

Are you absolutely sure your SLI is working?. Did you check it using some kind of tool like I was mentioning before?

[RickRuski]

Hi Guys,

Sorry I haven't been too active on the forum lately. The other things to look at is make sure that you don't shut down Inspector when playing COD, (you will have to select the correct profile each time as in my case it reverts to GLOBAL) just minimise it. EVGA Precision tool is a great way of checking that your Sli is operating as it will show: -

Temp of both cards
How the card useage is on both in % (I find that the demand on both cards shifts from one to the other thou not greatly as the graphics demand).
And FPS on both cards.
This tool is available through the EVGA web site and is suitable for all Nvidia cards regardless of manufacturer.

In the Nvidia control panel set Physics option to CPU (this takes the demand off the GPU).

I still have some minor stutter problems but only when down low and mainly over land (hope the coming patches will address a fully working Sli (this was broken prior to release and hasn't been fixed as yet, the profile I am using is a work around until then).

Cheers
Rick

[jimbop]

@KeBrAnTo, RickRuski: Yes, SLI is definitely working while flying with mirrored temps, usage, VRAM usage in EVGA Precision. Just no increase in framerate and increased stutters.

[KeBrAnTo]

Originally Posted by jimbop

@KeBrAnTo, RickRuski: Yes, SLI is definitely working while flying with mirrored temps, usage, VRAM usage in EVGA Precision. Just no increase in framerate and increased stutters.

Hi jimbop, I just started a thread where I wrote down some tips in order to help some people tuning-up their PC's for the sim. http://forum.1cpublishing.eu/showthread.php?t=27762

It doesn't seem to me that you are new to the subject I'm dealing with in that post, but who knows, maybe it could be helpful just to give it a quick read.

S!

[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?