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Which SLI Settings will give me the best performance for games with physx?

post #1 of 6
Thread Starter 
hello i have the following Graphics card setup

3 EVGA GTX 580 Classified Hydro Copper
3-way SLI
Driver Version: Latest Drivers

Now my question is, When using the Nvidia Control Panel to setup SLI, which settings will give me the best performance with Physx?

The options are as follows:

Auto-Select: What exactly does it do, and how does it work?

Gforce GTX 580 (1)
Gforce GTX 580 (2)
Gforce GTX 580 (3)
CPU

Check Box "Dedicate to Physx'



thanks
post #2 of 6
Check the CPU, or none, u don't want a whole 580 just doing phyisx
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getting sweet
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post #3 of 6
Thread Starter 
why not?
post #4 of 6
Because then it won't be processing graphics, and it can do a heck of a lot more use processing graphics.
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post #5 of 6
Auto-select will just cause ANY one of your 3 GPU's to be used for physX ... that option means that the driver is going to pick one.

If you check 'dedicate to physX' and choose a card, that card will be removed from acting as part of your SLI set (i.e. it won't do any rendering, just physX).

As long as you don't 'dedicate' one card to physX, then the card you choose will stay as part of your SLI set, and that one card will do both physX and rendering, while the other two do rendering only.

In your shoes, with 3 580's, if I were playing a game with a relatively easy rendering demand, but a high physX demand like Mafia 2 or Alice:MR, I'd probably dedicate one card to physX, with the other two running in SLI for rendering. If the physX were really easy and the rendering was difficult, like, say Metro 2033 ... I wouldn't dedicate a card to physX for that, I'd leave the rig in Tri-SLI mode and put physX on one of the 3.

Generally, myself ... I don't like running physX on one of my cards while they're in SLI. Games just don't 'feel right' to me the times I've done so. I prefer to either use a 3rd, dedicated card, or I just break up my 470 SLI and run physX on one, and do rendering on the other.

Either way, you can just experiment with which setting works best for a given game ... but make sure you actually PLAY the game, don't just rely on a benchmark. I get higher FPS on the Mafia 2 benchmark when I keep my SLI set together, and run physX on one of the two (i.e. a non-dedicated config), but I prefer the game play experience with one card doing rendering and one doing physX. Just 'feels better', even though the FPS is a bit lower.
Edited by brettjv - 4/2/12 at 10:50pm
    
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post #6 of 6
Thread Starter 
Quote:
Originally Posted by brettjv View Post

Auto-select will just cause ANY one of your 3 GPU's to be used for physX ... that option means that the driver is going to pick one.
If you check 'dedicate to physX' and choose a card, that card will be removed from acting as part of your SLI set (i.e. it won't do any rendering, just physX).
As long as you don't 'dedicate' one card to physX, then the card you choose will stay as part of your SLI set, and that one card will do both physX and rendering, while the other two do rendering only.
In your shoes, with 3 580's, if I were playing a game with a relatively easy rendering demand, but a high physX demand like Mafia 2 or Alice:MR, I'd probably dedicate one card to physX, with the other two running in SLI for rendering. If the physX were really easy and the rendering was difficult, like, say Metro 2033 ... I wouldn't dedicate a card to physX for that, I'd leave the rig in Tri-SLI mode and put physX on one of the 3.
Generally, myself ... I don't like running physX on one of my cards while they're in SLI. Games just don't 'feel right' to me the times I've done so. I prefer to either use a 3rd, dedicated card, or I just break up my 470 SLI and run physX on one, and do rendering on the other.
Either way, you can just experiment with which setting works best for a given game ... but make sure you actually PLAY the game, don't just rely on a benchmark. I get higher FPS on the Mafia 2 benchmark when I keep my SLI set together, and run physX on one of the two (i.e. a non-dedicated config), but I prefer the game play experience with one card doing rendering and one doing physX. Just 'feels better', even though the FPS is a bit lower.

Best answer on this thread by far!

thanks

i actually do exactly what you do on those games to the letter! LOL

i wish i had room for 4 GTX 580 Classified Hydros and a SoundBLaster! But i am waiting for a GTX 680 4GB Hydro single slot to be made before i change these babies
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