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Alternate Frame Rendering

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I was wondering if someone can educate me on this a little.. I have two 780s in SLI and when I play on a couple old games like Mabinogi and Minecraft I want to at least make them take advantage of my two cards by going to the nvidia control panel and in Manage 3D settings, change the setting to "Alternate Frame Rendering 1/2."
Why is it that when I force the games to run in those settings actually decrease my framerates instead of actually increasing them? I would imagine that having the cards take turns producing a frame would help?
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Anatolii
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post #2 of 2
Quote:
Originally Posted by Kiros View Post

I was wondering if someone can educate me on this a little.. I have two 780s in SLI and when I play on a couple old games like Mabinogi and Minecraft I want to at least make them take advantage of my two cards by going to the nvidia control panel and in Manage 3D settings, change the setting to "Alternate Frame Rendering 1/2."
Why is it that when I force the games to run in those settings actually decrease my framerates instead of actually increasing them? I would imagine that having the cards take turns producing a frame would help?

When you force AFR onto a 3D application, it is known to see a significant drop in performance due to negative scaling. Why? Because the 3D application is not hard coded to support multiple GPU utilization. However, you can sometimes squeeze some additional performance by trying different SLI flags (I think that's what Nvidia call them) via Nvidia Inspector, or via forcing pre-defined game profiles (Profiles created for other games. e.g. BF4 SLI profile for Battlefield 4). Most of the time, all this proves to be unsuccessful on some 3D applications (Often older games, Pre 2009). In addition, many older games can only take use a single CPU core, which will bottleneck your SLI configuration so much so that the fps drops each time a CPU overhead is hit, despite AFR working correctly (This gives to illusion of negative scaling). Finally, Nvidia's drivers are not too friendly on forcing Multiple GPU Utilization unlike AMD, which support users in forcing AFR, Op 1x1, Scissor and supertile. This has been proven to work as good as a pre-defined profile thankfully, so drivers can play a part too. The chance of finding a good SLI compatibility flag for a game which might not even support SLI seems like hours of trouble with diminished chances. I recommend disabling SLI for older games. Also, you mentioned Minecraft? That might actually be working in SLI (probably not though), but Minecraft is far too CPU heavy as it only utilizes a small portion of a single CPU core.
Edited by BradleyW - 3/17/14 at 12:09pm
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