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Witcher 2 - No Tri-SLI Scaling or just poor SLI Scaling? - Page 3

post #21 of 29
Quote:
Originally Posted by digiadventures View Post
Cpu bottleneck is constant in all resolutions.
Lets say cpu can deliver 100 fps in a game. Then thats the maximum the game will ran at any resolution or any graphic settings.
However,if gpu cant keep up with cpu and deliver 100 fps,then your fps will be lower.
Cpu bottleneck is always there,its just that its hidden in higer resolutions because card cant keep up and delivers less fps then cpu
Bottom line,either cpu or gpu always have to be a bottleneck otherwise you would be getting 999999999999 fps lol
Or to answer your question yes cpu can be a bottleneck no metter what graphic intensive settings you choose. If your gpu's have reech cpu fps limit,then cpu will bottleneck
Did you try disabling ubersampling option ? If there is no great fps boost,then its clear cpu is a bottleneck
CPU Bottlenecks are seriously overated a lot of the time, once you get into Nvidia Surround resolutions it's all GPU dependant anyway and your CPU has a very small part to play at that point.
 
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post #22 of 29
Thread Starter 
I think I'll try earlier drivers...whichever ones that still have 3D working properly, maybe the 280 WHQLs. Because I just tried Shogun 2 and Just Cause 2 1080p max benches, and 3-way shows big improvements over 2-way SLI. And not even logical improvements - 100% scaling, which is higher than logical. Same exact thing with DA 2 - in the Kirkland square, 40 FPS vs. 70 FPS in 2-way vs. 3-way SLI.

Sigh drivers.

e: Tried 280 WHQL, no difference. Welp. I don't know why a game that works with SLI at 1080p can't scale with Tri-SLI at 1080p. I'm curious as to whether the scaling was happening at 5760x1080 - each monitor is connected to its own video card, after all. Don't have the time to play with SLI bridges and check out Surround 2-way vs. 3-way in this game. As noted above, I do know that Tri-SLI definitely works in other games at 1080p so there is no 'CPU bottleneck' or any other valid reason for this to happen, just driver laziness.
Edited by matrices - 10/16/11 at 1:09pm
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post #23 of 29
Quote:
Originally Posted by matrices View Post
I think I'll try earlier drivers...whichever ones that still have 3D working properly, maybe the 280 WHQLs. Because I just tried Shogun 2 and Just Cause 2 1080p max benches, and 3-way shows big improvements over 2-way SLI. And not even logical improvements - 100% scaling, which is higher than logical. Same exact thing with DA 2 - in the Kirkland square, 40 FPS vs. 70 FPS in 2-way vs. 3-way SLI.

Sigh drivers.

e: Tried 280 WHQL, no difference. Welp. I don't know why a game that works with SLI at 1080p can't scale with Tri-SLI at 1080p. I'm curious as to whether the scaling was happening at 5760x1080 - each monitor is connected to its own video card, after all. Don't have the time to play with SLI bridges and check out Surround 2-way vs. 3-way in this game. As noted above, I do know that Tri-SLI definitely works in other games at 1080p so there is no 'CPU bottleneck' or any other valid reason for this to happen, just driver laziness.
Whether it is 'CPU bottleneck' or just 'driver laziness' or even a combination of them, I think it is quite game-specific.

Read this review of GTX570 (single, 2-way SLI, 3-way SLI at 2560x1600). Unfortunately Witcher 2 was not included in the review as the game was not released when the review was done. Fairly good read and is quite relevant to your situation.
http://benchmarkextreme.com/Articles/GTX%20570/P5.html

The only way to find out is to do a simple CPU scaling test for 3-way SLI at 1080p. See the example graph below. You just vary your i5 frequency from, say, 3GHz to 4GHz (as x-axis) and plot the fps (as y-axis). If the graph is leveling off near 4GHz (red line), then there is no CPU bottleneck. If the graph has a good slope approaching 4GHz (green line), then CPU bottleneck is present.

Edited by windfire - 10/16/11 at 5:58pm
post #24 of 29
Aside from your whole bottlenecking scenario, I'm just curious as to why you have 1500 dollars+ worth of video cards and you're running them with a single 1080p monitor
    
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post #25 of 29
I had 2 6990's in Quadfire and Witcher 2 with Ubersampling on still played like crap. It's a coding/driver issue.
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post #26 of 29
Thread Starter 
Quote:
Originally Posted by xPrestonn View Post
Aside from your whole bottlenecking scenario, I'm just curious as to why you have 1500 dollars+ worth of video cards and you're running them with a single 1080p monitor
I have three 120hz monitors, as you can see from my sig.

The reason I'm running in 1080p is...the whole point of this thread. The game isn't scaling with three GPUs so I don't have the horsepower to run it on three monitors in 3D unless I disable ubersampling.

Honestly I keep going back and forth anyway. 3D exposes so much beautiful detail but it's not easy on the eyes and you can't even see half of either flanking screen in Surround mode with the glasses on.

It just sucks that I only get around 30 FPS if I want to play 2D Surround with ubersampling, 3D Surround non-uber sampling, or 3D single screen uber sampling.

If I play without uber-sampling and without 3D in surround mode, only then do I get 60+ FPS.
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post #27 of 29
Thread Starter 
Quote:
Originally Posted by windfire View Post
Whether it is 'CPU bottleneck' or just 'driver laziness' or even a combination of them, I think it is quite game-specific.

Read this review of GTX570 (single, 2-way SLI, 3-way SLI at 2560x1600). Unfortunately Witcher 2 was not included in the review as the game was not released when the review was done. Fairly good read and is quite relevant to your situation.
http://benchmarkextreme.com/Articles/GTX%20570/P5.html

The only way to find out is to do a simple CPU scaling test for 3-way SLI at 1080p. See the example graph below. You just vary your i5 frequency from, say, 3GHz to 4GHz (as x-axis) and plot the fps (as y-axis). If the graph is leveling off near 4GHz (red line), then there is no CPU bottleneck. If the graph has a good slope approaching 4GHz (green line), then CPU bottleneck is present.
That's a good read, thanks. But what it shows is what my own brief tests already show: Dragon Age 2, Just Cause 2, Shogun 2 all show a substantial FPS increase in Tri-SLI compared with regular SLI at 1080p on my rig.

I seriously doubt that magically Witcher 2 is the one game that is CPU limited when the far likelier explanation is ineffective drivers.

There is always *some* bottleneck somewhere, to be sure, otherwise as someone said your FPS in any given game would be infinite. So for instance I expect Tri-SLI scaling to be 2/3 as good as dual-SLI scaling, based on a Guru 3D benchmark review I saw from a year ago or so, because CPU can't keep up. But 0% scaling? Yeah...I'm thinking drivers.
Edited by matrices - 10/16/11 at 6:48pm
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post #28 of 29
Quote:
Originally Posted by matrices View Post
I have three 120hz monitors, as you can see from my sig.

The reason I'm running in 1080p is...the whole point of this thread. The game isn't scaling with three GPUs so I don't have the horsepower to run it on three monitors in 3D unless I disable ubersampling.

Honestly I keep going back and forth anyway. 3D exposes so much beautiful detail but it's not easy on the eyes and you can't even see half of either flanking screen in Surround mode with the glasses on.

It just sucks that I only get around 30 FPS if I want to play 2D Surround with ubersampling, 3D Surround non-uber sampling, or 3D single screen uber sampling.

If I play without uber-sampling and without 3D in surround mode, only then do I get 60+ FPS.
whoops, that's what I get for using OCN on my itouch and skimming the op.
    
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post #29 of 29
Thread Starter 
Guess I'll just have to wait until Kepler, which should be twice as fast. It'll be like having four GTX 580s but I won't have to deal with 3-way driver issues.

Of course this game is too good to wait for a second playthrough so I'm doing that now and after I do that I'll probably be done with it.

So I'll just go through the agonizing all over again for Witcher 3.
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