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GTX 570 and 9800GX2 for physx?

post #1 of 11
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Wondering how well this would work... I've never used a dedicated physx card before. I do know that if I enable physx on the 9800gx2, one gpu would be sitting idle, but that's fine by me. Will I experience any issues doing this though?
post #2 of 11
Quote:
Originally Posted by slngsht View Post

Wondering how well this would work... I've never used a dedicated physx card before. I do know that if I enable physx on the 9800gx2, one gpu would be sitting idle, but that's fine by me. Will I experience any issues doing this though?

First off. Do you use anything that use's PhysX? If you do then you just have to see if using the card as a phys x card helps or not. IMO I think its to weak of a card and will bring down your 570.
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post #3 of 11
The 9800GX2 is a dual GPU card, therefore only ONE GPU within that card will be used for PhysX, not both of them. It would be the same as using a GTX 9800 for PhysX.
This and the 9800GX2 is loud and very hot.
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post #4 of 11
You won't experience any issues, but it will primarily help most when your GPU is maxed.... Ex: 1080P w/ DX11 and 4X multi sampling + PhysX
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post #5 of 11
Quote:
Originally Posted by slngsht View Post

Wondering how well this would work... I've never used a dedicated physx card before. I do know that if I enable physx on the 9800gx2, one gpu would be sitting idle, but that's fine by me. Will I experience any issues doing this though?


That won't be an issue. You might want to set PhysX to medium instead of high/max for PhysX intensive titles to achive good FPS.

 

 

As to why:

 


 

 

 

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post #6 of 11

While every Physx game may differ in the type and amount of Physx effects, let me just use Mafia II as an example of intensive Physx effects.

 

With an 8800GTX as a dedicated Physx card, the framerate got boosted by about 13% (from 39.5 fps to 45 fps) for my GTX570 at 1920x1200, with every possible settings maxed.

 

As each core of the 9800GX2 contains 128 shaders (same as an 8800GTX), I expect it will give a similar level of help to your situation as well.

 

Of course, if you use a stronger Physx card, the % boost will increase.  But then, you will also need to factor in the cost-to-performance benefit as well.

 

For Mafia II, use these numbers for reference:-

GTX570 as main = base reference

GTX570 as main, 8800GTX as Physx = +13% fps

GTX570 as main, GTX285 as Physx = +25% fps

GTX570 as main, GTX570 as Physx = +41% fps

GTX570 SLI (with one card as Physx) = +19% fps

 

 


Edited by windfire - 2/17/12 at 6:03am
post #7 of 11
It will help out a bit in physX intensive games (Around a 10% FPS boost) but is that worth the extra heat and power draw?

Id say it's not. Especially considering you'll only be making use of a single GPU in the 9800GX2. If you insist on a dedicated PhysX card then look at a single slot GPU like the 9800GT. Makes more sense in my books.
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post #8 of 11
If you already have one spare and can't be bothered selling it, use it.

But really you don't ever need a PhysX card at all, you'll barely see an improvement, and when you do it's only in certain games.

It's stupid to use it really, just sell it for $80 or something.
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post #9 of 11
I suggest selling it and use that money to upgrade your CPU / Motherboard because you will get a much larger FPS gain from a 2500K + P67/Z68 board than using the 9800GX2 for PhysX
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post #10 of 11
There is no point in using a physx card that isn't from the same series as the one you're using. I forget where I read this but there were some results that backed up that statement.

EX: 580+550Ti, but no 580+480.
    
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