I have done some reading on dedicated Physx but I aint quiet sure what it does exactly for your performance.
Currently I have a GTX 280 and maybe thinking of getting a GTX 480 in the future, now I read having SLI with one card dedicated to Physx will increase your performance. But two mixed cards dont work together ? or that doesnt matter when one only does Physx ?
Was just wondering what the ups and downs are when using this setup ?
I have done some reading on dedicated Physx but I aint quiet sure what it does exactly for your performance.
Currently I have a GTX 280 and maybe thinking of getting a GTX 480 in the future, now I read having SLI with one card dedicated to Physx will increase your performance. But two mixed cards dont work together ? or that doesnt matter when one only does Physx ?
Was just wondering what the ups and downs are when using this setup ?
I have done some reading on dedicated Physx but I aint quiet sure what it does exactly for your performance.
Currently I have a GTX 280 and maybe thinking of getting a GTX 480 in the future, now I read having SLI with one card dedicated to Physx will increase your performance. But two mixed cards dont work together ? or that doesnt matter when one only does Physx ?
Was just wondering what the ups and downs are when using this setup ?
I have done some reading on dedicated Physx but I aint quiet sure what it does exactly for your performance.
Currently I have a GTX 280 and maybe thinking of getting a GTX 480 in the future, now I read having SLI with one card dedicated to Physx will increase your performance. But two mixed cards dont work together ? or that doesnt matter when one only does Physx ?
Was just wondering what the ups and downs are when using this setup ?
Hi, If you have 2 gtx's in sli they will share the phys between them, however both cards have to be the same model but any brand. But you must have a SLI bridge connecting them.
But if you want a card just to just be dedicated to phys then the card used can be of any model and brand. and i'm pretty sure you don't use the sli bridge for this setup, hopefully someone else can confirm this.
Hi, If you have 2 gtx's in sli they will share the phys between them, however both cards have to be the same model but any brand. But you must have a SLI bridge connecting them.
But if you want a card just to just be dedicated to phys then the card used can be of any model and brand. and i'm pretty sure you don't use the sli bridge for this setup, hopefully someone else can confirm this.
Hi, If you have 2 gtx's in sli they will share the phys between them, however both cards have to be the same model but any brand. But you must have a SLI bridge connecting them.
But if you want a card just to just be dedicated to phys then the card used can be of any model and brand. and i'm pretty sure you don't use the sli bridge for this setup, hopefully someone else can confirm this.
Hi, If you have 2 gtx's in sli they will share the phys between them, however both cards have to be the same model but any brand. But you must have a SLI bridge connecting them.
But if you want a card just to just be dedicated to phys then the card used can be of any model and brand. and i'm pretty sure you don't use the sli bridge for this setup, hopefully someone else can confirm this.
[quote name='W4J' post='1040247' date='Apr 15 2010, 04:10 PM']Hi, If you have 2 gtx's in sli they will share the phys between them, however both cards have to be the same model but any brand. But you must have a SLI bridge connecting them.
But if you want a card just to just be dedicated to phys then the card used can be of any model and brand. and i'm pretty sure you don't use the sli bridge for this setup, hopefully someone else can confirm this.
hope that helps.[/quote]
Yes mate,
I asked a similar question in the graphics card forum here. I have a crossfire motherboard so I will never be able to SLI
BUT
I found out I could shove my older nVidia cards into the spare slot so I could make use of the CUDA/physx cores. If only I knew that before giving away my older card!
Make sure you test to see if you have room on the mobo by physically plugging in the spare card in the spare slot before doing this...
edit
Obviously, you will only see benifit with the physx/cuda setup if the games make use of them - yah?
[quote name='W4J' post='1040247' date='Apr 15 2010, 04:10 PM']Hi, If you have 2 gtx's in sli they will share the phys between them, however both cards have to be the same model but any brand. But you must have a SLI bridge connecting them.
But if you want a card just to just be dedicated to phys then the card used can be of any model and brand. and i'm pretty sure you don't use the sli bridge for this setup, hopefully someone else can confirm this.
hope that helps.
Yes mate,
I asked a similar question in the graphics card forum here. I have a crossfire motherboard so I will never be able to SLI
BUT
I found out I could shove my older nVidia cards into the spare slot so I could make use of the CUDA/physx cores. If only I knew that before giving away my older card!
Make sure you test to see if you have room on the mobo by physically plugging in the spare card in the spare slot before doing this...
edit
Obviously, you will only see benifit with the physx/cuda setup if the games make use of them - yah?
Lord, grant me the serenity to accept the things I cannot change, the courage to change the things I can, and the wisdom to know the difference.
-------------------
Vitals: Windows 7 64bit, i5 2500 @ 4.4ghz, SLI GTX670, 8GB, Viewsonic VX2268WM
[quote name='W4J' post='1040247' date='Apr 15 2010, 04:10 PM']Hi, If you have 2 gtx's in sli they will share the phys between them, however both cards have to be the same model but any brand. But you must have a SLI bridge connecting them.
But if you want a card just to just be dedicated to phys then the card used can be of any model and brand. and i'm pretty sure you don't use the sli bridge for this setup, hopefully someone else can confirm this.
hope that helps.[/quote]
Yes mate,
I asked a similar question in the graphics card forum here. I have a crossfire motherboard so I will never be able to SLI
BUT
I found out I could shove my older nVidia cards into the spare slot so I could make use of the CUDA/physx cores. If only I knew that before giving away my older card!
Make sure you test to see if you have room on the mobo by physically plugging in the spare card in the spare slot before doing this...
edit
Obviously, you will only see benifit with the physx/cuda setup if the games make use of them - yah?
[quote name='W4J' post='1040247' date='Apr 15 2010, 04:10 PM']Hi, If you have 2 gtx's in sli they will share the phys between them, however both cards have to be the same model but any brand. But you must have a SLI bridge connecting them.
But if you want a card just to just be dedicated to phys then the card used can be of any model and brand. and i'm pretty sure you don't use the sli bridge for this setup, hopefully someone else can confirm this.
hope that helps.
Yes mate,
I asked a similar question in the graphics card forum here. I have a crossfire motherboard so I will never be able to SLI
BUT
I found out I could shove my older nVidia cards into the spare slot so I could make use of the CUDA/physx cores. If only I knew that before giving away my older card!
Make sure you test to see if you have room on the mobo by physically plugging in the spare card in the spare slot before doing this...
edit
Obviously, you will only see benifit with the physx/cuda setup if the games make use of them - yah?
Lord, grant me the serenity to accept the things I cannot change, the courage to change the things I can, and the wisdom to know the difference.
-------------------
Vitals: Windows 7 64bit, i5 2500 @ 4.4ghz, SLI GTX670, 8GB, Viewsonic VX2268WM
I asked a similar question in the graphics card forum here. I have a crossfire motherboard so I will never be able to SLI
BUT
I found out I could shove my older nVidia cards into the spare slot so I could make use of the CUDA/physx cores. If only I knew that before giving away my older card!
Make sure you test to see if you have room on the mobo by physically plugging in the spare card in the spare slot before doing this...
edit
Obviously, you will only see benifit with the physx/cuda setup if the games make use of them - yah?[/quote]
Yes, well current my mobo doesnt support SLI but was planning on getting a new one anyway, it doesnt support any i7 930 or something, currently running a 3.2 Dual core.
And well going GTX 480 will mean its time for a quad core I think :)
I asked a similar question in the graphics card forum here. I have a crossfire motherboard so I will never be able to SLI
BUT
I found out I could shove my older nVidia cards into the spare slot so I could make use of the CUDA/physx cores. If only I knew that before giving away my older card!
Make sure you test to see if you have room on the mobo by physically plugging in the spare card in the spare slot before doing this...
edit
Obviously, you will only see benifit with the physx/cuda setup if the games make use of them - yah?
Yes, well current my mobo doesnt support SLI but was planning on getting a new one anyway, it doesnt support any i7 930 or something, currently running a 3.2 Dual core.
And well going GTX 480 will mean its time for a quad core I think :)
I asked a similar question in the graphics card forum here. I have a crossfire motherboard so I will never be able to SLI
BUT
I found out I could shove my older nVidia cards into the spare slot so I could make use of the CUDA/physx cores. If only I knew that before giving away my older card!
Make sure you test to see if you have room on the mobo by physically plugging in the spare card in the spare slot before doing this...
edit
Obviously, you will only see benifit with the physx/cuda setup if the games make use of them - yah?[/quote]
Yes, well current my mobo doesnt support SLI but was planning on getting a new one anyway, it doesnt support any i7 930 or something, currently running a 3.2 Dual core.
And well going GTX 480 will mean its time for a quad core I think :)
I asked a similar question in the graphics card forum here. I have a crossfire motherboard so I will never be able to SLI
BUT
I found out I could shove my older nVidia cards into the spare slot so I could make use of the CUDA/physx cores. If only I knew that before giving away my older card!
Make sure you test to see if you have room on the mobo by physically plugging in the spare card in the spare slot before doing this...
edit
Obviously, you will only see benifit with the physx/cuda setup if the games make use of them - yah?
Yes, well current my mobo doesnt support SLI but was planning on getting a new one anyway, it doesnt support any i7 930 or something, currently running a 3.2 Dual core.
And well going GTX 480 will mean its time for a quad core I think :)
PhysX will only run on a single GPU core even in SLI, so if you have 2 GPU in SLI, one of the GPU will load balance the PhysX kernel and driver kernel. This will naturally decrease overall SLI performance and scaling somewhat by the amount of GPU time used for PhysX.
Personally I have found that running PhysX + SLI simultaneously on GTX 280 SLI results in a bit of a stuttery mess. There is a workaround however to get 1 GPU to run the driver and the other to run PhysX if you go into NVCP and choose SLI Performance mode > "Single-GPU". This allows you to dedicate 1 GPU to graphics and 1 GPU to PhysX and the result is much smoother gamplay as GT200 can only run 1 kernel at a time so its constantly context switching when it has to run PhysX also.
With a single GTX 480, my results were very similar to GTX 280 SLI, and using a single GTX 280 as PhysX with a GTX 480 resulted in slightly better results in Batman AA. Overall if I had to choose I would go with a single 480 over 280 SLI when it comes to PhysX given the 480 handles concurrent kernels better and is the better solution overall. Similarly, I would go with a faster single GTX 400 card if possible over 2 slower cards 1 for graphics and 1 for PhysX. You'll just get a lot more mileage and benefit out of that GTX 400 card because it'll benefit you in every non-PhysX game as well.
PhysX will only run on a single GPU core even in SLI, so if you have 2 GPU in SLI, one of the GPU will load balance the PhysX kernel and driver kernel. This will naturally decrease overall SLI performance and scaling somewhat by the amount of GPU time used for PhysX.
Personally I have found that running PhysX + SLI simultaneously on GTX 280 SLI results in a bit of a stuttery mess. There is a workaround however to get 1 GPU to run the driver and the other to run PhysX if you go into NVCP and choose SLI Performance mode > "Single-GPU". This allows you to dedicate 1 GPU to graphics and 1 GPU to PhysX and the result is much smoother gamplay as GT200 can only run 1 kernel at a time so its constantly context switching when it has to run PhysX also.
With a single GTX 480, my results were very similar to GTX 280 SLI, and using a single GTX 280 as PhysX with a GTX 480 resulted in slightly better results in Batman AA. Overall if I had to choose I would go with a single 480 over 280 SLI when it comes to PhysX given the 480 handles concurrent kernels better and is the better solution overall. Similarly, I would go with a faster single GTX 400 card if possible over 2 slower cards 1 for graphics and 1 for PhysX. You'll just get a lot more mileage and benefit out of that GTX 400 card because it'll benefit you in every non-PhysX game as well.
PhysX will only run on a single GPU core even in SLI, so if you have 2 GPU in SLI, one of the GPU will load balance the PhysX kernel and driver kernel. This will naturally decrease overall SLI performance and scaling somewhat by the amount of GPU time used for PhysX.
Personally I have found that running PhysX + SLI simultaneously on GTX 280 SLI results in a bit of a stuttery mess. There is a workaround however to get 1 GPU to run the driver and the other to run PhysX if you go into NVCP and choose SLI Performance mode > "Single-GPU". This allows you to dedicate 1 GPU to graphics and 1 GPU to PhysX and the result is much smoother gamplay as GT200 can only run 1 kernel at a time so its constantly context switching when it has to run PhysX also.
With a single GTX 480, my results were very similar to GTX 280 SLI, and using a single GTX 280 as PhysX with a GTX 480 resulted in slightly better results in Batman AA. Overall if I had to choose I would go with a single 480 over 280 SLI when it comes to PhysX given the 480 handles concurrent kernels better and is the better solution overall. Similarly, I would go with a faster single GTX 400 card if possible over 2 slower cards 1 for graphics and 1 for PhysX. You'll just get a lot more mileage and benefit out of that GTX 400 card because it'll benefit you in every non-PhysX game as well.
PhysX will only run on a single GPU core even in SLI, so if you have 2 GPU in SLI, one of the GPU will load balance the PhysX kernel and driver kernel. This will naturally decrease overall SLI performance and scaling somewhat by the amount of GPU time used for PhysX.
Personally I have found that running PhysX + SLI simultaneously on GTX 280 SLI results in a bit of a stuttery mess. There is a workaround however to get 1 GPU to run the driver and the other to run PhysX if you go into NVCP and choose SLI Performance mode > "Single-GPU". This allows you to dedicate 1 GPU to graphics and 1 GPU to PhysX and the result is much smoother gamplay as GT200 can only run 1 kernel at a time so its constantly context switching when it has to run PhysX also.
With a single GTX 480, my results were very similar to GTX 280 SLI, and using a single GTX 280 as PhysX with a GTX 480 resulted in slightly better results in Batman AA. Overall if I had to choose I would go with a single 480 over 280 SLI when it comes to PhysX given the 480 handles concurrent kernels better and is the better solution overall. Similarly, I would go with a faster single GTX 400 card if possible over 2 slower cards 1 for graphics and 1 for PhysX. You'll just get a lot more mileage and benefit out of that GTX 400 card because it'll benefit you in every non-PhysX game as well.
I have done some reading on dedicated Physx but I aint quiet sure what it does exactly for your performance.
Currently I have a GTX 280 and maybe thinking of getting a GTX 480 in the future, now I read having SLI with one card dedicated to Physx will increase your performance. But two mixed cards dont work together ? or that doesnt matter when one only does Physx ?
Was just wondering what the ups and downs are when using this setup ?
I have done some reading on dedicated Physx but I aint quiet sure what it does exactly for your performance.
Currently I have a GTX 280 and maybe thinking of getting a GTX 480 in the future, now I read having SLI with one card dedicated to Physx will increase your performance. But two mixed cards dont work together ? or that doesnt matter when one only does Physx ?
Was just wondering what the ups and downs are when using this setup ?
I have done some reading on dedicated Physx but I aint quiet sure what it does exactly for your performance.
Currently I have a GTX 280 and maybe thinking of getting a GTX 480 in the future, now I read having SLI with one card dedicated to Physx will increase your performance. But two mixed cards dont work together ? or that doesnt matter when one only does Physx ?
Was just wondering what the ups and downs are when using this setup ?
I have done some reading on dedicated Physx but I aint quiet sure what it does exactly for your performance.
Currently I have a GTX 280 and maybe thinking of getting a GTX 480 in the future, now I read having SLI with one card dedicated to Physx will increase your performance. But two mixed cards dont work together ? or that doesnt matter when one only does Physx ?
Was just wondering what the ups and downs are when using this setup ?
But if you want a card just to just be dedicated to phys then the card used can be of any model and brand. and i'm pretty sure you don't use the sli bridge for this setup, hopefully someone else can confirm this.
hope that helps.
But if you want a card just to just be dedicated to phys then the card used can be of any model and brand. and i'm pretty sure you don't use the sli bridge for this setup, hopefully someone else can confirm this.
hope that helps.
But if you want a card just to just be dedicated to phys then the card used can be of any model and brand. and i'm pretty sure you don't use the sli bridge for this setup, hopefully someone else can confirm this.
hope that helps.
But if you want a card just to just be dedicated to phys then the card used can be of any model and brand. and i'm pretty sure you don't use the sli bridge for this setup, hopefully someone else can confirm this.
hope that helps.
But if you want a card just to just be dedicated to phys then the card used can be of any model and brand. and i'm pretty sure you don't use the sli bridge for this setup, hopefully someone else can confirm this.
hope that helps.[/quote]
Yes mate,
I asked a similar question in the graphics card forum here. I have a crossfire motherboard so I will never be able to SLI
BUT
I found out I could shove my older nVidia cards into the spare slot so I could make use of the CUDA/physx cores. If only I knew that before giving away my older card!
Make sure you test to see if you have room on the mobo by physically plugging in the spare card in the spare slot before doing this...
edit
Obviously, you will only see benifit with the physx/cuda setup if the games make use of them - yah?
But if you want a card just to just be dedicated to phys then the card used can be of any model and brand. and i'm pretty sure you don't use the sli bridge for this setup, hopefully someone else can confirm this.
hope that helps.
Yes mate,
I asked a similar question in the graphics card forum here. I have a crossfire motherboard so I will never be able to SLI
BUT
I found out I could shove my older nVidia cards into the spare slot so I could make use of the CUDA/physx cores. If only I knew that before giving away my older card!
Make sure you test to see if you have room on the mobo by physically plugging in the spare card in the spare slot before doing this...
edit
Obviously, you will only see benifit with the physx/cuda setup if the games make use of them - yah?
Lord, grant me the serenity to accept the things I cannot change, the courage to change the things I can, and the wisdom to know the difference.
-------------------
Vitals: Windows 7 64bit, i5 2500 @ 4.4ghz, SLI GTX670, 8GB, Viewsonic VX2268WM
Handy Driver Discussion
Helix Mod - community fixes
Bo3b's Shaderhacker School - How to fix 3D in games
3dsolutionsgaming.com - videos, reviews and 3D fixes
But if you want a card just to just be dedicated to phys then the card used can be of any model and brand. and i'm pretty sure you don't use the sli bridge for this setup, hopefully someone else can confirm this.
hope that helps.[/quote]
Yes mate,
I asked a similar question in the graphics card forum here. I have a crossfire motherboard so I will never be able to SLI
BUT
I found out I could shove my older nVidia cards into the spare slot so I could make use of the CUDA/physx cores. If only I knew that before giving away my older card!
Make sure you test to see if you have room on the mobo by physically plugging in the spare card in the spare slot before doing this...
edit
Obviously, you will only see benifit with the physx/cuda setup if the games make use of them - yah?
But if you want a card just to just be dedicated to phys then the card used can be of any model and brand. and i'm pretty sure you don't use the sli bridge for this setup, hopefully someone else can confirm this.
hope that helps.
Yes mate,
I asked a similar question in the graphics card forum here. I have a crossfire motherboard so I will never be able to SLI
BUT
I found out I could shove my older nVidia cards into the spare slot so I could make use of the CUDA/physx cores. If only I knew that before giving away my older card!
Make sure you test to see if you have room on the mobo by physically plugging in the spare card in the spare slot before doing this...
edit
Obviously, you will only see benifit with the physx/cuda setup if the games make use of them - yah?
Lord, grant me the serenity to accept the things I cannot change, the courage to change the things I can, and the wisdom to know the difference.
-------------------
Vitals: Windows 7 64bit, i5 2500 @ 4.4ghz, SLI GTX670, 8GB, Viewsonic VX2268WM
Handy Driver Discussion
Helix Mod - community fixes
Bo3b's Shaderhacker School - How to fix 3D in games
3dsolutionsgaming.com - videos, reviews and 3D fixes
I asked a similar question in the graphics card forum here. I have a crossfire motherboard so I will never be able to SLI
BUT
I found out I could shove my older nVidia cards into the spare slot so I could make use of the CUDA/physx cores. If only I knew that before giving away my older card!
Make sure you test to see if you have room on the mobo by physically plugging in the spare card in the spare slot before doing this...
edit
Obviously, you will only see benifit with the physx/cuda setup if the games make use of them - yah?[/quote]
Yes, well current my mobo doesnt support SLI but was planning on getting a new one anyway, it doesnt support any i7 930 or something, currently running a 3.2 Dual core.
And well going GTX 480 will mean its time for a quad core I think :)
I asked a similar question in the graphics card forum here. I have a crossfire motherboard so I will never be able to SLI
BUT
I found out I could shove my older nVidia cards into the spare slot so I could make use of the CUDA/physx cores. If only I knew that before giving away my older card!
Make sure you test to see if you have room on the mobo by physically plugging in the spare card in the spare slot before doing this...
edit
Obviously, you will only see benifit with the physx/cuda setup if the games make use of them - yah?
Yes, well current my mobo doesnt support SLI but was planning on getting a new one anyway, it doesnt support any i7 930 or something, currently running a 3.2 Dual core.
And well going GTX 480 will mean its time for a quad core I think :)
I asked a similar question in the graphics card forum here. I have a crossfire motherboard so I will never be able to SLI
BUT
I found out I could shove my older nVidia cards into the spare slot so I could make use of the CUDA/physx cores. If only I knew that before giving away my older card!
Make sure you test to see if you have room on the mobo by physically plugging in the spare card in the spare slot before doing this...
edit
Obviously, you will only see benifit with the physx/cuda setup if the games make use of them - yah?[/quote]
Yes, well current my mobo doesnt support SLI but was planning on getting a new one anyway, it doesnt support any i7 930 or something, currently running a 3.2 Dual core.
And well going GTX 480 will mean its time for a quad core I think :)
I asked a similar question in the graphics card forum here. I have a crossfire motherboard so I will never be able to SLI
BUT
I found out I could shove my older nVidia cards into the spare slot so I could make use of the CUDA/physx cores. If only I knew that before giving away my older card!
Make sure you test to see if you have room on the mobo by physically plugging in the spare card in the spare slot before doing this...
edit
Obviously, you will only see benifit with the physx/cuda setup if the games make use of them - yah?
Yes, well current my mobo doesnt support SLI but was planning on getting a new one anyway, it doesnt support any i7 930 or something, currently running a 3.2 Dual core.
And well going GTX 480 will mean its time for a quad core I think :)
Personally I have found that running PhysX + SLI simultaneously on GTX 280 SLI results in a bit of a stuttery mess. There is a workaround however to get 1 GPU to run the driver and the other to run PhysX if you go into NVCP and choose SLI Performance mode > "Single-GPU". This allows you to dedicate 1 GPU to graphics and 1 GPU to PhysX and the result is much smoother gamplay as GT200 can only run 1 kernel at a time so its constantly context switching when it has to run PhysX also.
With a single GTX 480, my results were very similar to GTX 280 SLI, and using a single GTX 280 as PhysX with a GTX 480 resulted in slightly better results in Batman AA. Overall if I had to choose I would go with a single 480 over 280 SLI when it comes to PhysX given the 480 handles concurrent kernels better and is the better solution overall. Similarly, I would go with a faster single GTX 400 card if possible over 2 slower cards 1 for graphics and 1 for PhysX. You'll just get a lot more mileage and benefit out of that GTX 400 card because it'll benefit you in every non-PhysX game as well.
Personally I have found that running PhysX + SLI simultaneously on GTX 280 SLI results in a bit of a stuttery mess. There is a workaround however to get 1 GPU to run the driver and the other to run PhysX if you go into NVCP and choose SLI Performance mode > "Single-GPU". This allows you to dedicate 1 GPU to graphics and 1 GPU to PhysX and the result is much smoother gamplay as GT200 can only run 1 kernel at a time so its constantly context switching when it has to run PhysX also.
With a single GTX 480, my results were very similar to GTX 280 SLI, and using a single GTX 280 as PhysX with a GTX 480 resulted in slightly better results in Batman AA. Overall if I had to choose I would go with a single 480 over 280 SLI when it comes to PhysX given the 480 handles concurrent kernels better and is the better solution overall. Similarly, I would go with a faster single GTX 400 card if possible over 2 slower cards 1 for graphics and 1 for PhysX. You'll just get a lot more mileage and benefit out of that GTX 400 card because it'll benefit you in every non-PhysX game as well.
-=HeliX=- Mod 3DV Game Fixes
My 3D Vision Games List Ratings
Intel Core i7 5930K @4.5GHz | Gigabyte X99 Gaming 5 | Win10 x64 Pro | Corsair H105
Nvidia GeForce Titan X SLI Hybrid | ROG Swift PG278Q 144Hz + 3D Vision/G-Sync | 32GB Adata DDR4 2666
Intel Samsung 950Pro SSD | Samsung EVO 4x1 RAID 0 |
Yamaha VX-677 A/V Receiver | Polk Audio RM6880 7.1 | LG Blu-Ray
Auzen X-Fi HT HD | Logitech G710/G502/G27 | Corsair Air 540 | EVGA P2-1200W
Personally I have found that running PhysX + SLI simultaneously on GTX 280 SLI results in a bit of a stuttery mess. There is a workaround however to get 1 GPU to run the driver and the other to run PhysX if you go into NVCP and choose SLI Performance mode > "Single-GPU". This allows you to dedicate 1 GPU to graphics and 1 GPU to PhysX and the result is much smoother gamplay as GT200 can only run 1 kernel at a time so its constantly context switching when it has to run PhysX also.
With a single GTX 480, my results were very similar to GTX 280 SLI, and using a single GTX 280 as PhysX with a GTX 480 resulted in slightly better results in Batman AA. Overall if I had to choose I would go with a single 480 over 280 SLI when it comes to PhysX given the 480 handles concurrent kernels better and is the better solution overall. Similarly, I would go with a faster single GTX 400 card if possible over 2 slower cards 1 for graphics and 1 for PhysX. You'll just get a lot more mileage and benefit out of that GTX 400 card because it'll benefit you in every non-PhysX game as well.
Personally I have found that running PhysX + SLI simultaneously on GTX 280 SLI results in a bit of a stuttery mess. There is a workaround however to get 1 GPU to run the driver and the other to run PhysX if you go into NVCP and choose SLI Performance mode > "Single-GPU". This allows you to dedicate 1 GPU to graphics and 1 GPU to PhysX and the result is much smoother gamplay as GT200 can only run 1 kernel at a time so its constantly context switching when it has to run PhysX also.
With a single GTX 480, my results were very similar to GTX 280 SLI, and using a single GTX 280 as PhysX with a GTX 480 resulted in slightly better results in Batman AA. Overall if I had to choose I would go with a single 480 over 280 SLI when it comes to PhysX given the 480 handles concurrent kernels better and is the better solution overall. Similarly, I would go with a faster single GTX 400 card if possible over 2 slower cards 1 for graphics and 1 for PhysX. You'll just get a lot more mileage and benefit out of that GTX 400 card because it'll benefit you in every non-PhysX game as well.
-=HeliX=- Mod 3DV Game Fixes
My 3D Vision Games List Ratings
Intel Core i7 5930K @4.5GHz | Gigabyte X99 Gaming 5 | Win10 x64 Pro | Corsair H105
Nvidia GeForce Titan X SLI Hybrid | ROG Swift PG278Q 144Hz + 3D Vision/G-Sync | 32GB Adata DDR4 2666
Intel Samsung 950Pro SSD | Samsung EVO 4x1 RAID 0 |
Yamaha VX-677 A/V Receiver | Polk Audio RM6880 7.1 | LG Blu-Ray
Auzen X-Fi HT HD | Logitech G710/G502/G27 | Corsair Air 540 | EVGA P2-1200W