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post #11 of 16
Time off for a second!

Even though I know Physx varies from one game to another, I am not too convinced by that graph and so I dig into the original review site. And, I find a much different graph! (see pic below). Strange?

Link: http://www.gamegpu.ru/action-/-fps-/...-test-gpu.html

So, only a lowly 8600GT Physx card would hurt a GTX480. I suspect a 8800GT would help a bit, if not in this game, then in another game.

As you already have two 8800GTs on hand, I suggest you just sell one and retain the other for Physx. In a game like Mafia II where a 8800GT Physx card hurts, you just disable it and assign the Physx work back to your main card (GTX570/580). In another game it helps, just enable it.
Basically, you just leave yourself an additional option to deal with Physx. Additionally, that 8800GT might act as an emergency backup card.

Unless, of course, you are in dire need of cash and have to sell both cards to raise money for a GTX570/580. But this is not the case as you are going to give away them.

I am in a similar situation. I used to have a pair of 8800GTXs. Now, I upgrade to a GTX570 and am installing one of my 8800GTXs as Physx card to supplement my GTX570. I will use the above approach myself.
post #12 of 16
Thread Starter 
Quote:
Originally Posted by windfire View Post
Time off for a second!

Even though I know Physx varies from one game to another, I am not too convinced by that graph and so I dig into the original review site. And, I find a much different graph! (see pic below). Strange?

Link: http://www.gamegpu.ru/action-/-fps-/...-test-gpu.html

So, only a lowly 8600GT Physx card would hurt a GTX480. I suspect a 8800GT would help a bit, if not in this game, then in another game.

As you already have two 8800GTs on hand, I suggest you just sell one and retain the other for Physx. In a game like Mafia II where a 8800GT Physx card hurts, you just disable it and assign the Physx work back to your main card (GTX570/580). In another game it helps, just enable it.
Basically, you just leave yourself an additional option to deal with Physx. Additionally, that 8800GT might act as an emergency backup card.

Unless, of course, you are in dire need of cash and have to sell both cards to raise money for a GTX570/580. But this is not the case as you are going to give away them.

I am in a similar situation. I used to have a pair of 8800GTXs. Now, I upgrade to a GTX570 and am installing one of my 8800GTXs as Physx card to supplement my GTX570. I will use the above approach myself.

that's pretty incredible, i wonder how that other chart came to be? interesting...considering my overclocked 8800gt is the same as the 9800 gtx, then i think i'll keep it. good find man, good find
    
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post #13 of 16
I agree with Windfire ... his is the graph I've seen most often, and frankly the idea that the 9800GTX would hurt, esp. on that game where having a dedicated card moves the cloth physX to the GPU instead of the CPU, doesn't make a lot of sense.

I think a 88/9800GT makes a fine physX card, personally. And I think it's unlikely to ever actually slow down your FPS vs running physX on a single card. Think about it ... you are adding power to your system by moving these calculations off of your rendering card and onto a different card, and allowing your main card to focus fully on the rendering.

I think the only way you slow your system down is by using a really pathetic physX card and a really fast rendering card.
    
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post #14 of 16
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Quote:
Originally Posted by brettjv View Post
I agree with Windfire ... his is the graph I've seen most often, and frankly the idea that the 9800GTX would hurt, esp. on that game where having a dedicated card moves the cloth physX to the GPU instead of the CPU, doesn't make a lot of sense.

I think a 88/9800GT makes a fine physX card, personally. And I think it's unlikely to ever actually slow down your FPS vs running physX on a single card. Think about it ... you are adding power to your system by moving these calculations off of your rendering card and onto a different card, and allowing your main card to focus fully on the rendering.

I think the only way you slow your system down is by using a really pathetic physX card and a really fast rendering card.
well the biggest issue i've heard people complaining about is that the card they're using for physx isn't as capable as the other card is alone...112 cuda cores vs 512 for example...512 clearly has the advantage, but when you offload physx to the 112 then things are just fine and your fps increases...however when there's a lot more physics to be processed, like in a lot of explosions, then the 112 cores isn't enough and it doesn't get split between it and the more powerful card, in fact it's "dedicated" so it actually hurts your fps...

that said, as long as there isn't too much physics being processed at any one time it should be a performance increase...that's why i was asking about using the 8800gt for physics...in fact from the get go i was hoping that using dx11 meant the physx card wouldnt be disabled since it doesn't support dx11, which i was told earlier was correct...now as for a 8800gt +gtx 570 combo goes, we're looking at a new ball game...
    
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post #15 of 16
Quote:
Originally Posted by victorofhavoc View Post
well the biggest issue i've heard people complaining about is that the card they're using for physx isn't as capable as the other card is alone...112 cuda cores vs 512 for example...512 clearly has the advantage, but when you offload physx to the 112 then things are just fine and your fps increases...however when there's a lot more physics to be processed, like in a lot of explosions, then the 112 cores isn't enough and it doesn't get split between it and the more powerful card, in fact it's "dedicated" so it actually hurts your fps...

that said, as long as there isn't too much physics being processed at any one time it should be a performance increase...that's why i was asking about using the 8800gt for physics...in fact from the get go i was hoping that using dx11 meant the physx card wouldnt be disabled since it doesn't support dx11, which i was told earlier was correct...now as for a 8800gt +gtx 570 combo goes, we're looking at a new ball game...
Don't forget though that if the scene were so intense in terms of physX that you needed 150 cores to keep up, that if you DON'T have the physX card, you are sapping 150 cores from the 512 core card, which means those cores can't be used for doing the shader calculations needed to render the scene.

IOW, it's not like doing the physX on a single card is 'free' ... So provided you don't actually 'need' more than the 112 shaders to do the physX (and it'd be *very* rare that you do), there's no logical reason why the use of the dedicated card wouldn't raise the overall performance by way of preserving the full power of your main card to use it's CUDA cores to do the rendering.

And I've never, ever seen a physX bench that showed that performance was WORSE by using a card of the power of an 8800GT for physX. An 8500GT, sure, but not a 8800GT.

You follow my logic on this?
Edited by brettjv - 1/5/11 at 9:28pm
    
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post #16 of 16
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Quote:
Originally Posted by brettjv View Post
Don't forget though that if the scene were so intense in terms of physX that you needed 150 cores to keep up, that if you DON'T have the physX card, you are sapping 150 cores from the 512 core card, which means those cores can't be used for doing the shader calculations needed to render the scene.

IOW, it's not like doing the physX on a single card is 'free' ... So provided you don't actually 'need' more than the 112 shaders to do the physX (and it'd be *very* rare that you do), there's no logical reason why the use of the dedicated card wouldn't raise the overall performance by way of preserving the full power of your main card to use it's CUDA cores to do the rendering.

And I've never, ever seen a physX bench that showed that performance was WORSE by using a card of the power of an 8800GT for physX. An 8500GT, sure, but not a 8800GT.

You follow my logic on this?

sorry for the late response...i do follow your logic, but i have a feeling in the future it will be happening more...my only worry is that when physx really starts catching on that ati cards wont be bought as much and the pc gaming market will start to dim...but oh well...at least we have physx and consoles don't
    
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