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Under what circumstances would PhysX be useful?

post #1 of 10
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I'm just looking into this... and I haven't seen anybody actually recommend using a card for PhysX. See if this makes sense:

If you have a GPU configuration that is pretty strong, you typically would do something to give it a little boost by using a PhysX card, right? But any card that would give a noticeable advantage would have to be only one or two generations behind.

For example, let's say you have a pair of 460's in SLI. Odds are you are not upgrading from GTX280's or something like that. But if you are, then you are the type of person who is always buying bleeding edge hardware. In which case, your hardware doesn't get much help from a PhysX card, because it's already bleeding edge.

Alternatively, if you're the person who buys new stuff every third or fourth generation, then odds are if you currently have a GTX560ti, then your previous card was NOT a 460. And your card before that was probably not a 260. It was probably a 9800-something.

Now I know that not every person can be slotted into these two categories. But to bottom line it for everybody:

1. Those who have a card that's only a generation behind likely have high end hardware that won't benefit from PhysX.
2. Those who have a card that's several generations old will be unable to get any benefit from it due to its age.

I do make some generalizations here....but I wonder....
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post #2 of 10
Using a 9800GTX for dedicated PhysX w/my GTX 470 in Metro 2033 gave me quite a noticeable performance boost. That won't necessarily be true in all cases, though.
post #3 of 10
I only play 1 game where it's even used and even in that game, I can't tell the difference unless I'm actually trying to compare. To me, it's a joke and not even worth paying attention to.
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post #4 of 10
Quote:
Originally Posted by sccr64472;15514606 
I only play 1 game where it's even used and even in that game, I can't tell the difference unless I'm actually trying to compare. To me, it's a joke and not even worth paying attention to.

sums it up pretty well.
     
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post #5 of 10
Quote:
Originally Posted by sccr64472;15514606 
I only play 1 game where it's even used and even in that game, I can't tell the difference unless I'm actually trying to compare. To me, it's a joke and not even worth paying attention to.

This.
post #6 of 10
[ame]http://www.youtube.com/watch?v=ls6DrPX1XDE&feature=related&noredirect=1[/ame]

Watch at about 3:15 on the video

I doubt its the generation. More the mid-range or high range cards.

Unless you watch allthe background stuff you wont notice.
Edited by hednik - 10/30/11 at 7:53pm
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post #7 of 10
Mafia II is the game that uses PhysX the most. True story is that with a GTX580 it could handle the game maxed out and PhysX ON. Metro is the only game it cant handle and thats not because of PhysX. Basically having dedicated PhysX is pointless unless you also use it for folding.
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post #8 of 10
If you notice low frames in a very active game environment. Like papers flying around, dust in the air, flags flopping around. If you have anything under a gtx460 and the game you are playing is fairly new. Try adding a spare 9800gt to the setup, I bet your frames will increase. If you don't have a rather new card it should help.
Edited by Grath - 10/30/11 at 8:04pm
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post #9 of 10
First off, just to be clear, there's only a handful of games that support Hardware Accelerated PhysX. Those are the only games for which having a physX card (whether it's a dedicated card, or just an nVidia card in general, doing both rendering and physX calcs) is of any use, otherwise, it does absolutely nothing.

The time when a dedicated physX card is useful is when you're playing a physX game, AND the rendering load alone is difficult enough that having your rendering card ALSO doing physX affects your fps to the point that you're not happy w/the performance. In this scenario, it's nice to have a dedicated physX card so your main card can be dedicated to the rendering task.

So, a lot of the necessity for a dedicated card comes down to what game, what settings, and how powerful your primary card is. Most of the games that support physX ATM aren't that arduous to run in terms of rendering, but a few of them can be pretty tough to run on a single card at maxed setttings and higher resolutions. Alice:Madness Returns and Mafia 2 are two such games, and I'm guessing so will Arkham City when it comes out for PC.

I would also point out that physX can be only run on one card, even when your cards are in SLI, the physX calcs will be done on only one card of the SLI set. However, both cards in an SLI set are directed by the driver to render at the same speed.

So, if you run physX calcs on one of your cards in a SLI set, whatever the 'hit' is on the one card will be reflected on the other card as well, so you end up with a 'doubling' of the physX load in SLI, and generally speaking pretty poor overall SLI scaling when physX is involved. That's just something I've tested and observed, and is handy to 'know about' ...

Personally in my experience of running a dedicated 8800GT as a physX card w/my 470's in SLI, on all the three HW physX games I've tried it with (Mafia 2, BMAA, and Alice:MR), I've noticed a nice improvement in terms of overall gameplay smoothness in all three. However, it does increase heat/temps quite a bit, mostly by restricting airflow but also via simply adding the heat from an additional card.

Bottom-line I'd not bother going out and spending money on a dedicated physX card, but if you have a suitable one laying around that you can toss in whenever your 'into' a game that features HW physX support, doing so does provide a nice improvement to the gaming experience, esp. if your rendering card(s) is struggling w/the load of doing both rendering and physX calcs.

Here's a couple of physX benchmarks I've done in the past showing FPS per second on Mafia 2 and Batman AA. Note that the labels on the Mafia 2 test are reversed, the pink line is the SLI + dedicated card.

NOTE: Labels are accidentally reversed on the Mafia 2 graph, the Pink line is actually w/the dedicated card!!!

236768d1320031695-under-what-circumstances-would-physx-useful-465x2_mafia2_physx_results_8800gt.jpg

236769d1320031695-under-what-circumstances-would-physx-useful-465x2_batman_physx_3_results.jpg
Edited by brettjv - 10/31/11 at 10:59am
    
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post #10 of 10
I use 3dsmax & maya, which particle & "real world physics simulation" works with PhysX.
Or .. let's wait for mirror's edge 2 if it still uses PhysX biggrin.gif
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