SLI/Perfect 'Heartbeat'
 

I have a problem running IL-2 in perfect with sli enabled.

When I run on just one video card (I have 2x8800gt's) everything is smooth in perfect, but with SLI enabled there is a heartbeat like micropause. There is also a nasty flicker of shadows on the water.

Turning off perfect mode in SLI also cures these problems.

I have seen this problem reported by people here and there, but never any solutions.

I have tried all the .dll's.

I don't believe this is hardware specific unless it is to the 8000 series cards. I have 3 different machines that all do the same thing.

This machine is a Q6600/680i/4gb ram/2x8800gt setup, also have;
-Dell M1730/2.8ghz cpu (sorry, can't remember which one right now), 4gb ram/2x 8700M GT
-amd 6400+/Nforce 590/4gb ram/2x8800gts 640mb (the older ones)

I have tried several different drivers, all do it to some degree. Maybe you have one that works?

This is really annoying, I can get 60+fps most all the time in SLI, but must put up with this unacceptable stuff, so end up taking the hit and running one one card.

Here is my ;

[Render_OpenGL]
TexQual=3
TexMipFilter=3
TexCompress=0
TexFlags.UseDither=1
TexFlags.UseAlpha=0
TexFlags.UseIndex=0
TexFlags.PolygonStipple=1
TexFlags.UseClampedSprites=0
TexFlags.DrawLandByTriangles=1
TexFlags.UseVertexArrays=1
TexFlags.DisableAPIExtensions=0
TexFlags.ARBMultitextureExt=1
TexFlags.TexEnvCombineExt=1
TexFlags.SecondaryColorExt=1
TexFlags.VertexArrayExt=1
TexFlags.ClipHintExt=0
TexFlags.UsePaletteExt=0
TexFlags.TexAnisotropicExt=1
TexFlags.TexCompressARBExt=1

TexFlags.TexEnvCombine4NV=1
TexFlags.TexEnvCombineDot3=1
TexFlags.DepthClampNV=1
TexFlags.SeparateSpecular=1
TexFlags.TextureShaderNV=1

HardwareShaders=1

Shadows=2
Specular=2
SpecularLight=2
DiffuseLight=2
DynamicalLights=1
MeshDetail=2
VisibilityDistance=3

Sky=1
Forest=3
LandShading=3
LandDetails=2

LandGeom=2
TexLarge=1
TexLandQual=3
TexLandLarge=1

VideoSetupId=3
Water=4
Effects=2
ForceShaders1x=0

PolygonOffsetFactor=-0.15
PolygonOffsetUnits=-3.0
[DGen]
CampaignMissions=Hard
RandomFlights=3
CampaignLength=Medium
AirIntensity=High

I am running at;

[window]
width=1680
height=1050
ColourBits=32
DepthBits=24
StencilBits=8
ChangeScreenRes=1
FullScreen=1
DrawIfNotFocused=0
EnableResize=0
EnableClose=1
SaveAspect=0
Use3Renders=0

Any ideas?

Cdr

http://img.photobucket.com/albums/v3...or-dummies.jpg

;)

http://forum.1cpublishing.eu/showthr...highlight=8800

http://forum.1cpublishing.eu/showthr...ht=sli+flicker

Have you set the 'process affinity' on your dual core processor by removing the semi colon (;) that was originally in front of the first line in this section of your conf.ini???This caused me a lot of stutters...


[rts]
ProcessAffinityMask=1
mouseUse=2
joyUse=1
trackIRUse=1
DisableIME=0
locale=

BTW I have the exact same thing and if you research the threads posted there doesn't seem to be a fix. Some have reported better results with the new DLLs and some haven't. Also if you read threw there are very few guys running SLI and with the very problem being mentioned.

I've tried every driver and still its the same pulsing heartbeat stutter.

Its something to do with the game.

This is true with dual and 4 core CPUs but what he is describing has nothing to do with the problem. It's a SLI thing and it sucks

This post is completely not needed... Great links but if you want to go through 15 pages of junk that has nothing to do with the SLI problem then your post is great.

RTFM is a lame way to respond

Feuerfalke, nobody likes those self appointed internet know it alls. Those smug gits that argue out of habit and who always pretend that they know more than everybody else. You are on the fast track to becomming a real tosser. I advise you pull your head in a bit. You are becomming what you used to despise.

'A real Tosser!'
 

Well done Feathered IV - I usually would not get involved in this type of debate - I am a very 'old bloke' - older than a lot of people may realise and hopefully with a bit of wisdom. This forum and sim is all about WWII aviation and was created by a Russian aeronautical engineer - Oleg Maddox - it is the best WWII flight sim on the market today and an absolute credit to Oleg and his team. When BOB - SOW hits our screens (I don't care how long it takes) I will again be a very happy flight sim enthusiast.
DFLion

Actually, I think I know what you are referring to with the micro-pause, as I too suffered from it. I cannot tell you why it happens, but I did manage to get rid of it by disabling VSync.

Now as a Movie-maker I like my VSync as it stops tearing of the cockpit frame with head movement, but the micro-pause (almost as you put it in a rythm) was a real pain!

Disabling VSync fixed the problem and I too run a pair of 8800GTS (G92) in SLi, so it could be a common problem.

Maybe it could work for you, but that's what fixed it for me.

Also for odd water problem, have you downloaded the very latest .dll's from the 1C forum, which fixed a host of problems for the 8800's?

Link is in fourth post from the bottom of this page:

http://forum.1cpublishing.eu/showthr...t=patch&page=4

Hope that helps, cheers, MP.

Thanks for the post about diabling Vsync... man that kinda stinks not to have Vsync enabled though I think you're right. The rythmic stutter is terrible and really annoying. It could be a G92 thing because I know several guys running SLI on 8800GTXs and they don't get it or at least I have yet to see someone post about it.

No I haven't tried the new Dlls as it wasn't sure which ones are the latest. I will take a look at see what happens.

Stubes