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580 incoming, wondering if I can use a physx as well

post #1 of 13
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So for Christmas this year my parents said they'd give my a couple hundred towards a 580, so in a couple weeks I'll be getting one. I'm not worried about my power supply being able to support the 580, just wondering if I could tack on my 9800gt to use as a physx card.

Thanks in advance,
Swae.
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post #2 of 13
Yes you can, the GTX 580 is an insanely powerful card. The 9800GT would actually LOWER performance overall being that even with the GTX 580 rendering and handling PhysX processing is still faster than a 9800GT "helping". It creates more of a bottleneck in the end result since the 9800GT is slower than the GTX 580. I'm quite sure its a GTX 275 or 285 that matches the GTX 580 and wouldn't deter performance.
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post #3 of 13
Thread Starter 
Quote:
Originally Posted by LethalRise750 View Post
Yes you can, the GTX 580 is an insanely powerful card. The 9800GT would actually LOWER performance overall being that even with the GTX 580 rendering and handling PhysX processing is still faster than a 9800GT "helping". It creates more of a bottleneck in the end result since the 9800GT is slower than the GTX 580. I'm quite sure its a GTX 275 or 285 that matches the GTX 580 and wouldn't deter performance.
I've heard though, that if I just dedicate the 580 to graphics and the 9800gt to physx, it would increase performance, is this incorrect?
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post #4 of 13
Quote:
Originally Posted by LethalRise750 View Post
Yes you can, the GTX 580 is an insanely powerful card. The 9800GT would actually LOWER performance overall being that even with the GTX 580 rendering and handling PhysX processing is still faster than a 9800GT "helping". It creates more of a bottleneck in the end result since the 9800GT is slower than the GTX 580. I'm quite sure its a GTX 275 or 285 that matches the GTX 580 and wouldn't deter performance.
Quote:
Originally Posted by Swae View Post
I've heard though, that if I just dedicate the 580 to graphics and the 9800gt to physx, it would increase performance, is this incorrect?

I dont know if this is true, better to run some benchmarks first. I doubt you would know this kind of info first hand.
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post #5 of 13
I have seen possibly what Lethal was talking about Swae but I don't think it would hold you back.

Put it simply like this, a 580 may not show any significant gains with a 9800GT for Physx as opposed to just using the 580 for both rendering and Physx.

It won't make performance lower unless somehow the CPU is being utilized more and more for Physx. What this means is that Physx (which really eats up CPU cycles) may prevent priority given to the 580 for rendering FPS. Which means lower FPS.

The funny thing is, once you max out the potential of the GPU (9800GT) instead of Physx doing additional calculations on the 580, it goes straight to the CPU.

How bad is it? Not insanely bad, the 9800GT is a decent enough Physx card and relatively cheap. Newer games are able to use a GTX 275 for maxed out Physx, and to me that is just disgusting that Physx needs that much power. 9800GT is good enough for what most people play games with.

Physx IS NOT utilized by many games though, so don't go breaking the bank on it.
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post #6 of 13
Quote:
Originally Posted by RagingCain View Post
Physx IS NOT utilized by many games though, so don't go breaking the bank on it.
OP already has a 9800GT laying around some where. It wont go to waste.

Here's a thread where some guy uses a 9800GT + GTX 580. It gave him a decent increase in FPS.

Quote:
With both of these PhysX tests, I still gained a few FPS when using my 9800GT as a dedicated PhysX GPU. Glad to see those results, it will stay in my build. More benchmarks and temps to come over the course of the week.
http://www.evga.com/forums/tm.aspx?h...mpage=1#748790
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post #7 of 13
would have np running a GTX 580 and a 9800GT
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post #8 of 13
Yeah I agree, I think its a good fit for a dedicated card. I myself was looking at a 9800GTX+ but decided the gains were only be good for benchmarking which is not what I buy gear for anyways.
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post #9 of 13
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post #10 of 13
This is what I commented on, this is the only game that is capable of doing this to a Physx card such as an older 9800GT.

This is not a good reason to get a more powerful Physx card.
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