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Two Questions Regarding PhysX

post #1 of 15
Thread Starter 
Hey,

1) If I had two 9800GT's in SLI, do I need to bridge a 3rd 9800GT in order to let it process PhysX, or can I just have it in the 3rd SLI slot, without having to connect it with the other two?

2) Can I have an ATI HD4870 as the main graphics card, and have a secondary Nvidia card to process PhysX, and PhysX only? (obviously if question one is not ruled out, and a bridge is not necessary.) Would this even work when it comes down to games that have PhysX enabled?

Thanks.
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post #2 of 15
on a triple slot motherboard(depending on which one) you would have 2 9800GTs in slots 1 & 3 and SLIed, and the 3rd in the middle for physX.......only a single SLI bridge is needed for the 2 cards.......the 3rd is by itself
    
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post #3 of 15
Quote:
Originally Posted by Zonet View Post
Hey,

1) If I had two 9800GT's in SLI, do I need to bridge a 3rd 9800GT in order to let it process PhysX, or can I just have it in the 3rd SLI slot, without having to connect it with the other two?
Answer 1:
You will have to use a 3-way SLI bridge to connect all 3 cards together, to form a 3-way SLI group which will do graphic rendering and Physx.

For a 2-way SLI + a Dedicated Physx card, that Physx card has to be differ from the 2 SLIed cards. This is not your case because your 3rd card is also a 9800GT, which is the same as the other 2 cards

See the diagram below.
(link:http://www.slizone.com/object/sli_physx.html)

Edited by windfire - 1/2/11 at 10:37pm
post #4 of 15
Thread Starter 
Quote:
Originally Posted by windfire View Post
Answer 1:
You will have to use a 3-way SLI bridge to connect all 3 cards together, to form a 3-way SLI group which will do graphic rendering and Physx.

For a 2-way SLI + a Dedicated Physx card, that Physx card has to be differ from the 2 SLIed cards. This is not your case because your 3rd card is also a 9800GT, which is the same as the other 2 cards

See the diagram below.
(link:http://www.slizone.com/object/sli_physx.html)
Thanks for the reply.. You have confused me a little so let me ask... Does that mean (question one) the 9800GT's DO NOT have to be in Tri-SLI in order to have one to process PhysX only? (so that means 2 in SLI, and a 3rd without being having to connect to the bridge?)

Regarding the second question... I asked if I could game using an ATI HD4870 as the main card (just single) and use a 9800GT seperatly to process the PhysX of that game? Is it possible?

Thanks!
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post #5 of 15
Thread Starter 
Quote:
Originally Posted by Vlasov_581 View Post
on a triple slot motherboard(depending on which one) you would have 2 9800GTs in slots 1 & 3 and SLIed, and the 3rd in the middle for physX.......only a single SLI bridge is needed for the 2 cards.......the 3rd is by itself
Thanks. I take it its not possible to use an ATI card as a main card, and use a Nvidia card as a secondary (obviously not in SLI/Crossfire) to process the PhysX of that game?
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post #6 of 15
Quote:
Originally Posted by Zonet View Post
Thanks for the reply.. You have confused me a little so let me ask... Does that mean (question one) the 9800GT's DO NOT have to be in Tri-SLI in order to have one to process PhysX only? (so that means 2 in SLI, and a 3rd without being having to connect to the bridge?)

Regarding the second question... I asked if I could game using an ATI HD4870 as the main card (just single) and use a 9800GT seperatly to process the PhysX of that game? Is it possible?

Thanks!

1st Q: you have three 9800GT cards. They are identical. If you want all of them to work, they must be connected with a 3-way SLI bridge.

In other words, if you connect 1st and 2nd cards together with a 2-way bridge, 3rd card is alone without being connected, this will not work.

The diagram is quite clear. You are aiming for the top setting (ie ''3-way SLI'').

For ''2-way SLI + Dedicated Physx'', the 3rd card cannot be a 9800GT.
post #7 of 15
Wrong wrong and wrong.

9800GT's don't SUPPORT 3 way SLI.

SLI the two cards, the other can be used for PhysX just fine. Doesn't need to be on the SLI bridge, you don't even NEED the SLI bridge to use SLI anyway.

Yes, you can use an ATI/AMD card as primary, and a secondary Nvidia card just fine, as long as you're using Windows 7.
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post #8 of 15
Thread Starter 
Quote:
Originally Posted by pioneerisloud View Post
Wrong wrong and wrong.

9800GT's don't SUPPORT 3 way SLI.

SLI the two cards, the other can be used for PhysX just fine. Doesn't need to be on the SLI bridge, you don't even NEED the SLI bridge to use SLI anyway.

Yes, you can use an ATI/AMD card as primary, and a secondary Nvidia card just fine, as long as you're using Windows 7.
Thank you!

Couple of follow up questions:

1) Why is it not possible to use a 3rd card for PhysX if it is identical? (I know its not possible to Tri-SLI the 9800GT, I'm asking why its not possible to use the 3rd card, outside of the SLI for PhysX if it's an identical card.)

2) Regarding ATI + Dedi PhysX... How would I go about installing drivers for the ATI AND the Nvidia without conflictions? Little confused there.

Thanks again!
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post #9 of 15
Quote:
Originally Posted by Zonet View Post
Thank you!

Couple of follow up questions:

1) Why is it not possible to use a 3rd card for PhysX if it is identical? (I know its not possible to Tri-SLI the 9800GT, I'm asking why its not possible to use the 3rd card, outside of the SLI for PhysX if it's an identical card.)

2) Regarding ATI + Dedi PhysX... How would I go about installing drivers for the ATI AND the Nvidia without conflictions? Little confused there.

Thanks again!
You can use 3x 9800GT's just fine. You will be limited to 2x in SLI and the other strictly PhysX though.

There's a sticky in one of the graphics sub forums regarding the issue with ATI as primary and Nvidia as PhysX.
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post #10 of 15
if the 3 cards are identical but only support 2way SLI then the 3rd can be used for physX......i know when i had 3 8800 Ultras Tri-SLIed i only had an option for auto-select(recommended) or cpu......refer to this guide for ATI+nVidia physX
    
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