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Lowest nvidia card to use as physx card? - Page 5

post #41 of 64
the lowest possible is a 9500gt, or however many cuda cores those have.
unless it's changed over the past two months
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post #42 of 64
Quote:
Originally Posted by tats;13647366 
I just tried to do a test with my 460 as a dedicated card then just the 580 but even after disabling it the Nvidia control panel my 460 still went to 50% usage on the 580 only test - any suggestions?

So, you have gone into NVCP and set the PhysX card to be the 580, and yet when you run a GPU-physX game, you find that the 460 is still getting 50% usage? If so, that's strange ... What bench/game are we talking about here?

Oddly enough, some games/benches will just ignore what you set in the NVCP and do whatever they see fit. Your settings in NVCP do not always end up having the 'final say' in where the physX gets run, IOW.

I would try a restart, with the 580 set to do the PhysX when you shut down. You shouldn't have to do this, but it's worth trying just to see.
Quote:
Originally Posted by cook;13647386 
I think its 96 stream processor or more, or the attempted physics card will slow down the modern cards because they will be waiting for the dumb slow old card. The 8800/9800gt are the Minimum.

There's really no 'set number' like that, because it's going to depend on:
1) What model of card(s) you're using for the rendering, and
2) What game/bench you are running, and
3) What settings you run that game/bench at
Quote:
Originally Posted by Aussie;13647346 
I though he used mafia 2 as the benchmark for his testing?

I dunno what testing you're referring to, not sure I saw the thread. I was just making some general points in my post. Just as is the case w/about 95% of questions asked concerning hardware performance, the proper answer is 'it depends on the app that you run on that hardware'.

Mafia 2 is a game that should definitely favor using a dedicated physX card, unless it's just a wildly underpowered card vs. the main card(s).
Edited by brettjv - 5/26/11 at 3:06pm
    
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post #43 of 64
Quote:
Originally Posted by brettjv;13647533 
So, you have gone into NVCP and set the PhysX card to be the 580, and yet when you run a GPU-physX game, you find that the 460 is still getting 50% usage? If so, that's strange ... What bench/game are we talking about here?

Oddly enough, some games/benches will just ignore what you set in the NVCP and do whatever they see fit. Your settings in NVCP do not always end up having the 'final say' in where the physX gets run, IOW.

I would try a restart, with the 580 set to do the PhysX when you shut down. You shouldn't have to do this, but it's worth trying just to see.

Sorry I edited my post after, but I was trying to do a quick Fludmark test to see the difference between 580 +460 and just 580 but in both tests the 460 is getting used even after the NVCP setting was changed. Tried a restart and nothing...
post #44 of 64
Quote:
Originally Posted by brettjv;13647533 
I dunno what testing you're referring to, not sure I saw the thread. I was just making some general points in my post. Just as is the case w/about 95% of questions asked concerning hardware performance, the proper answer is 'it depends on the app that you run on that hardware'.

Mafia 2 is a game that should definitely favor using a dedicated physX card, unless it's just a wildly underpowered card vs. the main card(s).

[ame]http://www.youtube.com/watch?v=cbww3dhzK0M[/ame]
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post #45 of 64
I have two 6970s, what card wouldn't bottleneck me? I was thinking 260 core 216 wouldn't, or a 280.
    
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post #46 of 64
8600
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post #47 of 64
Yeah, Linus' results are not too shocking. Obviously you don't want to have TOO wild of a disparity between your rendering card and your physX card ... GTX580 (512 shaders) paired w/8600GTS (32 shaders) just too big of a difference. His results do show a benefit to even having a 550 as dedicated, wherein it's really not much different than a 580 as dedicated when paired with a 580.

It would've been cool if he'd done his tests with something in between a GTX550ti and a 8600GTS, though. That's quite a huge difference in power, so all we really know from his tests is that 580+8600 = bad, and 580+550ti = Good. It doesn't really tell us how something like a 64-shader 9600GT or 96-shader 9600GSO would do ... for all we know, a 9600GT works just as good as a 550ti ... I mean, probably not, but ... no way to know for sure.
    
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post #48 of 64
96SP or higher smile.gif
    
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post #49 of 64
Quote:
Originally Posted by brettjv;13648309 
Yeah, Linus' results are not too shocking. Obviously you don't want to have TOO wild of a disparity between your rendering card and your physX card ... GTX580 (512 shaders) paired w/8600GTS (32 shaders) just too big of a difference. His results do show a benefit to even having a 550 as dedicated, wherein it's really not much different than a 580 as dedicated when paired with a 580.

It would've been cool if he'd done his tests with something in between a GTX550ti and a 8600GTS, though. That's quite a huge difference in power, so all we really know from his tests is that 580+8600 = bad, and 580+550ti = Good. It doesn't really tell us how something like a 64-shader 9600GT or 96-shader 9600GSO would do ... for all we know, a 9600GT works just as good as a 550ti ... I mean, probably not, but ... no way to know for sure.

Yeah, I'm trying to find out what works best. Right now the single slot GTS450 looks nice though.
    
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post #50 of 64
Quote:
Originally Posted by Anthraxinsoup;13648150 
I have two 6970s, what card wouldn't bottleneck me? I was thinking 260 core 216 wouldn't, or a 280.

Just as is the case when talking about a CPU bottleneck, it depends on the application you run, and the settings at which you run it.

I'd be inclined to go with a 460 768MB card as your physX w/that much GPU power though ... although I'd not go out and buy one as there's so few games that support HW PhysX it's really not worth it. Not to mention the hassles involved with the AMD/PhysX hack.

Edit: just saw your last post ... I think a single-slot 450 would probably do pretty nicely ... esp. if you're playing at a real high resolution with high IQ settings. Just like w/a CPU, you're less likely to be bottlenecked by a slower physX card the lower the FPS your running at is. Obviously higher res and IQ = lower fps, so ...
Edited by brettjv - 5/26/11 at 4:37pm
    
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