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best physx for sli setup

post #1 of 10
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im wondering, is it best to leave physx to the cpu? i have 2x gtx 460 in sli. in the nvidia control panel it gives me a few options. i can have either one of the cards do the physx, i can leave it to auto, and i can also set it to cpu.

which one would yeild best results? right now i have it set to cpu.

any help in this matter is appreciated.
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post #2 of 10
NO NO NO NEVER EVER LET THE CPU DO PHYSX!!!!

c.
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post #3 of 10
I would make one of the 460's do it
post #4 of 10
Just leave it on recommended and if your gameplay isn't smooth turn off PhysX. No CPU right now can render PhysX in realtime, whether that is due to the lack of support on Nvidia's part or if its an architectural limitation is open for debate though.
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post #5 of 10
Quote:
Originally Posted by TickleMeElmo View Post
Just leave it on recommended and if your gameplay isn't smooth turn off PhysX. No CPU right now can render PhysX in realtime, whether that is due to the lack of support on Nvidia's part or if its an architectural limitation is open for debate though.
This. And the problem is Nvidia's coding, not a limit of the CPU's. We've been doing brilliant CPU Physics for YEARS now, with ease. The problem is Nvidia paying off developers to code the physics affects for their GPU's only. It's a marketing gimmick, that's all.

But leave yours on "auto" with SLI. Don't set it to CPU, as your CPU can't do it. It's not an Nvidia GPU, so your games WILL stutter with PhysX.

If you still experience poor framerates, turn the PhysX effects down, or buy a dedicated card (not worth it just for PhysX).
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post #6 of 10
Quote:
Originally Posted by TickleMeElmo View Post
Just leave it on recommended and if your gameplay isn't smooth turn off PhysX. No CPU right now can render PhysX in realtime, whether that is due to the lack of support on Nvidia's part or if its an architectural limitation is open for debate though.
980x can according to this video
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post #7 of 10
Rly? learn something new everyday, although i'm forced to set it to CPU cause my 9600's arent good enough
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post #8 of 10
Quote:
Originally Posted by SpartanVXL View Post
Rly? learn something new everyday, although i'm forced to set it to CPU cause my 9600's arent good enough
yes our cpus are horrible for it lmao only one i know of as of now is the 980x
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post #9 of 10
Quote:
Originally Posted by SpartanVXL View Post
Rly? learn something new everyday, although i'm forced to set it to CPU cause my 9600's arent good enough
If you turned SLI off, and just did rendering on one card, and PhysX on the other, you'd find a single 9600 is enough for that particular setup .

I'm using a GT240 for PhysX off my GTX470 main card. Works great, and it actually added to performance even.

With your SLI setup though, yes you're probably experiencing slow downs in SLI with PhysX on.
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post #10 of 10
In case you still need some help, I just answered an other members question about his two 560TI's.

Quote:
Originally Posted by SteveMcQueen View Post
Depends on the power you need in games.

You can do it in 2 ways:

a) SLI PhysX Rendering - tick "Enable 2Way SLI" in the drivers physx tab
this means one of your cards is going physx and rendering, whereas the other card just renders. this is the common way to use the physx in sli
560TI (1) - physx & rendering
560TI (2) - rendering

b) physx rendering with disabled sli - tick "do not use sli" in the driver physx tab
there is also a setting where the first card only handles physx tasks, whereas the second card does all the rendering stuff. very good for physx-heavy games like batman arkham asylum
560TI (1) Physx
560TI (2) Rendering

choose whats best for you. you cant do anything wrong.

E: ADVICE! NEVER PUT THAT ONTO THE CPU - IT WILL DROP YOUR FRAMES TO HELL!
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