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The Witcher 2 - SLI fix! (Guide)

post #1 of 89
Thread Starter 
I'll preface this saying I don't have a fix for ATI, assuming ATI owners are having CrossFire problems. This thread is SLI only.

What is this fix?

This is a Nvidia Inspector tweak that makes SLI work in Witcher 2. Currently it doesn't. After this fix you should see noticeable FPS improvements w/SLI. For example, with SLI GTX 580s you'll see a considerable gain in FPS at Ultra Spec w/UberSampling enabled. That said, there may still be more room for improvement down the road in official driver/game updates.

Problems

None to my knowledge, however I've only tested this fix for my GTX 580 TRI SLI; if this fix doesn't work for your other cards then maybe it's card specific? If you somehow mess up in Nvidia Inspector, at worse you may need to reinstall your Nvidia drivers.

I've heard of a "light leaking" bug with SLI, that is possibly fixed by forcing AFR2 (Alternate Frame Rendering 2) for The Witcher 2 (either through Nvidia Inspector or the Nvidia Control Panel). I haven't seen that bug yet.

Prerequisites

This fix has been tested to work for Nvidia drivers 270.61 (stable) and 275.27 (beta). There is no FPS improvement between the two after much testing. The beta drivers however have improved 3D Vision compatibility for The Witcher 2, and maybe other non-documented tweaks.

Instructions

1. Download and install Nvidia Inspector. (latest version to my knowledge is 1.9.5.5)

2. Open Nvidia Inspector. Click on the tool button at the right of the "Driver Version" box. This opens up the Profile Settings editor.

3. In the "Profiles" drop-down select "The Witcher 2". Under "Compatibility" (first section) look for "SLI compatibility bits". You want to change this field's value from whatever it is to 0x02C04205.

4. Hit "Apply Changes". You're done! There's no need to change anything else.

nvidiainspectorstep1.png

nvidiainspectorstep2.png

My Results

First, here's my game settings:

witcher2settingsultra19.png

Everything maxed, UberSampling enabled. My native resolution is 2560x1600, but since most people have 1080 monitors I'm testing at that resolution.

Without Fix:

Average FPS - 26
Average Usage - 40%

gpuusageslibroke.png

averagefpsslibroke.jpg

Video (Fraps @30)

[ame]http://www.youtube.com/watch?v=Sx6_25X0np0&hd=1[/ame]

With Fix:

Average FPS - 56
Average Usage - 83%
(at 2560x1600 usage for me was pretty much 99%)

Just for kicks, only with UberSampling disabled my FPS was above 120.

gpuusageslifixed.png

averagefpsslifixed.jpg

Video (Fraps @30)

[ame]http://www.youtube.com/watch?v=kteiCXx7oP4&hd=1[/ame]

Video (Fraps @60 - Best shows the vastly improved FPS)

[ame]http://www.youtube.com/watch?v=7QMaMTtBHI0&hd=1[/ame]
post #2 of 89
Those are great frames with Ubersampling on, hoping to use this fix in the near future!
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post #3 of 89
Thread Starter 
Here's with UberSampling off:

ubersamplingdisabledsli.jpg

[ame]http://www.youtube.com/watch?v=TALwJXCAxdU[/ame]

This is the first game I feel my TRI SLI is truly meant for. biggrin.gif Unlike DA2, this game is optimized amazingly for release. Haven't decided if I want to continue the game with UberSampling on or off. Game still looks great with it disabled. Even with the fix the FPS in heavy fights dips below 30, but with UberSampling off it's all gravy.
post #4 of 89
Nice guide buddy! I don't have a multi gpu setup but this will be very helpful for all the Witcher fans. Btw I'm loving this game so far. Best game I have ever played and the graphics and atmosphere is amazing. Sometimes I just look around and admire the land.

+rep
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post #5 of 89
WHoa...I had to double check my settings but I can confirm this worked for me.
Edited by Dooginater - 6/7/11 at 11:48pm
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post #6 of 89
that work but i get 10fps more than before
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post #7 of 89
Hope they'll have some crossfire fix as well.
    
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post #8 of 89
seems to work for me:

22114275.png
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post #9 of 89
Quote:
Originally Posted by velocd;13571468 
*snip*
This is my story.
I have latest beta drivers and the nvidia inspector compat bits but no matter what I try sli does not work for me.
I have 2 x 580gtx sli and an i7 950 @3.85 6 gig ram win7 64.
I have tried everything at every forum and cant understan it at all.
With unbersampling on my cards are at 98% but framerate is only 30 and too low for me. I want sli working without uber but as soon as I turn it off back to the same framerate as single card.
I see you are a programmer so perhaps you can help me with this.
I also have to say that their are other that can and can't get this fix working.
SLI and my rig works perfectly with every other game.
What else can it be that is keep my cards from working in sli properly without uber enabled.
Also when I press ctrl and bring up mini menu the framerate shoots up almost double in some scenes and the cards go up tp 99% as they do in cut scenes.
As far as I can tell when the ctrl is pushed the menu comes up on top of the rendered scene so framerate if anythink should go dowm. This means that perhsapd this is easily sorted but for now I need a fix.
post #10 of 89
it worked for me. Before SLI would only kick in 1 card to 99% while did other would sit around 4%. Now both cards are maxout at 99%. Still with uber enabled it runs smooth but u can see that the frame drops alot. I like my game running @ or above 60fps all the time. I really like how uber ON looks but now sure if i want such a hit perfomance. i get around 45-55 fps average but with Uber OFF i get 100's fps average.
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