Setting up Sli
 

Although I have only recently gone Sli I feel that I have found some things that help to get it running reasonably well.

(1) make SURE that all settings are the same in all adjustments (control panel, Invidia Inspector, etc) sometimes I have found that they aren't.

(2) Try and get all cards balanced so that voltages, frequencies, etc are the same. ( I use EVGA precision Tool for this purpose available at EVGA , my two cards are from different stables and therefore not the same clocks etc.)

(3) Overclocking sometimes has a negative effect (although my cards are factory O/C I have turned them down to stock settings and find them more stable)




Now have smooth play after cards reach operating temps.
Get EVGA "Precision" tool to show fps and card temps, also to balance frequencies and voltages.

SOMEONE SAID IN ONE OF THE REPLYS SOMEWHERE THAT THE "EVGA PRECISION TOOL" WOULDN'T WORK WITH THEIR GIGABYTE CARDS, I HAVE BEEN ASSURED AT THE EVGA FORUMS THAT THEY WILL WORK WITH ALL NVIDIA CARDS, SO WILL THE ALTURNATIVE MSI TOOL. So people give it a try.




THESE WERE OLD INSTRUCTIONS FOR USE PRIOR TO THE RELEASE OF LUTHIER'S SLI CODE AND I HAVE REMOVED THEM.

PLEASE USE THE CODE RELEASED BY LUTHIER: -


Profile "Il2: Cliffs of Dover"
ShowOn GeForce
ProfileType Application
Executable "il-2 sturmovik cliffs of dover/launcher.exe"
Setting ID_0x00a06946 = 0x000240f5
Setting ID_0x1033cec1 = 0x00000001
Setting ID_0x1033cec2 = 0x00000002
Setting ID_0x1033dcd1 = 0x00000004 UserSpecified=true
Setting ID_0x1033dcd2 = 0x00000004
Setting ID_0x1033dcd3 = 0x00000004
Setting ID_0x1074c972 = 0x00000001 UserSpecified=true
Setting ID_0x1095def8 = 0x00000004
Setting ID_0x1095def8 = 0x00000000 UserSpecified=true
Setting ID_0x10f9dc81 = 0x00000010 UserSpecified=true
EndProfile

See this thread on how to instal Luthier's Sli code: -

http://forum.1cpublishing.eu/showthread.php?t=37316





RickRuski

(4) Choose a title that is SLI supported. (Cliffs of Dover currently is not...it was broken in April)

Maybe not anymore, I see "Il2 Sturmovik Cliff of Dover" is listed in the latest "Nvidia Inspector" profile list. I have just made some adjustments to my original profile, and hello now have the smoothest play i have had with the new 285.27 beta driver. I will update the information in my post.

RickRuski

(5) Stop showing off Ruski. :D

MSI Afterburner shows that SLI is working and load is being displayed on my 2nd card but performance increase is absolutely zero compared to it running single GPU.

Nice solution Rick, I tried it on my two GTX570 and it is very nice and smooth play.

I can not say whether it is because of new NVIDIA drivers (wishfull thinking) or because of your SLI setup but anyhow, the result is very good! Thanks! :)

~S~

What I'm seeing is similar. My single card works at 90% -100% with good frame rates (45 -60 fps) at high detail and slight micro stutters at low altitude over landscape. Temperature runs quite warm (60 - 70 C) with fan running at high speed (noisy).

With beta 285.27 driver and Rick's settings in SLI the two cards are running in near parallel at 45% - 65% (higher percentage over land at low altitude) and temps are a little cooler (50 - 60 C) with fans running at lower speed (quieter). Frame rates seem the same as the single card with slight stuttering as well at low altitude over land.

I'm going to remain in SLI mode since there seems to be less operational wear & tear on the cards. Also there may be greater potential to handle greater graphical workloads such as Effects (explosions, clouds, instrument panels), but further work (well, play - actually ;) ) required here to determine that.

My 2.67 CPU is likely a bottleneck for SLI, and possibly 1C will come out with an optimized SLI profile to increase SLI performance.

Nice work, Rick!

Hey "Crazy" good to see you here, about time you got your butt of the couch. How about having a look at a "Mission Mate" for "Dover"

Cheers

Rick

Purg, one thing to have a look at is the "Control Panel" , make sure you have "Sli enabled". Also the other thing I have done in the C/P is to set "PhysX Settings" processor to cpu in the RH panel.

Glad you got it rocking. What video cards are you using?

Nevermind I saw it, 450s. To what capacity are both cards running?