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so this is actually probably going to be a fairly interesting video here on my

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test bench today I have two things I have a GTX 580 from

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EVGA and I also have an

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8600 GTS so that's a bit of a mismatch

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you'd think what I will be looking at today is the performance impact of a

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high performance graphics card versus a low performance graphics card as a

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dedicated FX processor so this GTX 58 is

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going to be doing all of my Graphics processing regardless and then I'm going

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to run two different scenarios I'm going to run with the 8600 GTS as my dedicated

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physx card and then I'm going to try running with another GTX 580 which is

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obviously ludicrously Overkill as my

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dedicated physx card so if you guys check out up here I have my physx

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configuration set so I have selected the 8600 GTS as

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my dedicated physx card and I'm going to try with both scenarios and I'll let you

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guys know how it goes well I've already

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run into some interesting results so I'm running at 1920 x 1080 on Mafia 2 I'm

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running with high details 8X AF anti-aliasing is on and I've already run

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only two scenarios so I've run the GTX

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580 with the 8600 GTS as a dedicated FX

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card and then I've run the GTX 580 ignoring the 8600 GTS so using itself

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for physx you can force that in the driver as well and and it actually

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scored or the GTX 580 actually scored

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66% Higher by itself than it did by tying it down with

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this 8600 GTS to do the physx processing so let's see what else we can

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investigate here so at this point guys I've run

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quite a few more fascinating scenarios so here you can see my GTX 580 running a

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GTX 550 TI as a dedicated physics card

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but I've actually finished all the Run throughs that I am going to do and I

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just want to share with you my results so this is also going to be a a sneak

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peek into what my next episode is going to be looking at PCIe bandwidth and the

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effects on gaming performance but here I have my full results so the GTX 580

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alone gets about 50 frames per second you throw in a FX card that's too slow

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and it goes all the way down to 30 FPS

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so what that means to me is that you're far better off to just let this card do

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both the graphics and the FX by itself

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then to give it something that's so slow that it bottlenecks it and that the

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physx calculations are going to be behind the rate at which this card can

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draw the frames okay so that is clearly a problem okay so then I tried a few

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cards of varying power as a dedicated

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physx card so I tried an additional GTX 580 I tried a GTX 560 TI as well as a

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GTX 550 so I don't know where the threshold is but it looks like this is

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how it works for physx because these three are all within margin of error of

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each other uh regardless of how much physx power we're throwing at it I mean

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a GTX 580 is clearly overkill for physx

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processing but you can see that the 550 TI and the 560 TI are also both just

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fine so the answer is I don't know exactly where that threshold is and it's

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going to depend from game to game how much physx processing is needed but what

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you need for physx is a card that is fast enough not too slow because that

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will bottleneck your entire setup and not so fast that you're spending way too

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much money on it so something like a 550 or even something a little bit lower end

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or maybe a last generation card that you can get your hands on on the cheap is

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probably the best bet if you have something like a GTX 580 as your main

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card so thanks for checking out this little fizx episode of Linus Tech tips

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don't forget to subscribe for more unboxings reviews computer videos and

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other good stuff like that