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Sli two 9800gt's for dedicated physx?

post #1 of 10
Thread Starter 
This is prob a stupid question but has anyone used sli for combining two nvidia cards for dedicated physx? And if they have does it work well? If it doesnt work why not?
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post #2 of 10
I believe you can only run one physx card.

You can run one for as your main 3d accel and the other as physx, but I guess you're asking if you can run your 5850 with two physx cards. I don't think that you can.
    
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post #3 of 10
Just to be clear, you are asking about using your 5850 + 2x9800gt's? I dont think you need to, a single 9800gt should be plenty for processing physx as far as I know.
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post #4 of 10
you can only dedicate one card to physx.
     
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post #5 of 10
Two 5850's, a single 9800GT for Physx and the other for 24/7 folding? (Assuming your a folder)
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post #6 of 10
To be more specific, it is not about single card or two cards. It is more about GPUs. Physx effects can only be done by a single GPU. That is, even if a single card like dual core GTX295 is used as a Dedicated Physx card, only 1 of its 2 cores will be utilized for the job.

Let Nvidia explains:
http://www.nvidia.com/object/physx_faq.html#q4
post #7 of 10
Thread Starter 
Well, i asked this for knowledge more than anything. Lets set up some senerios so you can answer each?

If your a benchmarker who wants to boost his score using physx (shameful i know) so he wants to add a sli set up of two nvidia 9800gt cards to run physx
For his gtx 580. Can he do this?

If you got a 9800gtx2 (the dual gpu core card) and used it as a physx card would given it is a single card with two graphics processors would it use both cores for physx or just one core?

Can you run sli and crossfire at the same time using the same board aslong as your board is a x58 or something that supports both ati crossfire and nvidia sli?
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post #8 of 10
Thread Starter 
Quote:
Originally Posted by windfire View Post
To be more specific, it is not about single card or two cards. It is more about GPUs. Physx effects can only be done by a single GPU. That is, even if a single card like dual core GTX295 is used as a Dedicated Physx card, only 1 of its 2 cores will be utilized for the job.

Let Nvidia explains:
http://www.nvidia.com/object/physx_faq.html#q4
That right there is the answer i was after. Thank you all, rep+
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post #9 of 10
1. No matter what, you can ONLY use 1 core on one card for Physx.

2. You CAN run Crossfire/SLI and still dedicate a card to Physx. If you want more performance on the secondary side, anything under a GTS 450 will hinder you.

Just realized someone already answered it O_o I just woke up. Have mercy.
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post #10 of 10
Quote:
Originally Posted by Kal777 View Post
If your a benchmarker who wants to boost his score using physx (shameful i know) so he wants to add a sli set up of two nvidia 9800gt cards to run physx
For his gtx 580. Can he do this?

If you got a 9800gtx2 (the dual gpu core card) and used it as a physx card would given it is a single card with two graphics processors would it use both cores for physx or just one core?

Can you run sli and crossfire at the same time using the same board aslong as your board is a x58 or something that supports both ati crossfire and nvidia sli?
1. Only one of the two 9800GTs will be used to do Physx.
2. Only one of the two cores of the 9800GX2 will be used to do Physx.
Take a look at the chart below for all possible combination between SLi and Physx.

3. If you have a X58 mobo with four PCIEx16 slots, I suspect you can run two AMD cards in CF (as the main cards) and then 2 Nvidia cards in SLI (for Physx). But only one of the 2 Nvidia cards will be used for Physx, even if the pair works properly with hacked driver.

Edited by windfire - 3/15/11 at 7:20am
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