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Dedicated Physx not making much difference

post #1 of 8
Thread Starter 
Hey guys I recently got a 780 so I threw my old 680 in as a dedicated physx card which should be way way overkill for physx, but it seems like its doing nothing or very little. Its most noticeable in metro last light in the DLC missions like the heavy which is incredibly physx heavy and just murders the frame rate, doesn't make a difference what physx is running on.

Any ideas? Its all setup correctly in the NvCP
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post #2 of 8
Dedicated physx is not worth it... I did a lot of research on it, and tried it with GTX780s in SLI and and GTX580 or a GTX260 as dedicated, didn't see anything worthwhile, just higher power usage.

It only works if you have a non-physx capable main card (i.e Radeon) and run a Nvidia card as a dedicated physx processor. Even that takes a hack... since Nvidia killed the capability in their drivers....
Edited by cgipson1 - 4/11/14 at 5:56am
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post #3 of 8
physx is overrated
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post #4 of 8
Different games make different 'use' of dedicated physX cards. It seems like it shouldn't 'be that way' but in my experience that is the case. And I don't mean in the obvious way like it depends on whether or not your 'main' card has a bunch of extra headroom to handle the physX itself (in which case obviously a dedicated card will do less for you) I mean in terms of the programmiing itself. Sometimes, for example, a lot of the PhsyX code will run on the CPU no matter what you do (yes,even with games that support HW PhysX) which can lead you to think surmise that you need a dedicated GPU for physX when really that won't cause any additional offloading ... your stuck with the phsyX code runnign on the CPU no matter HOW MUCH GPU PhysX power you throw at the game. Borderlands 2, for example, is like that, and it's not the only one, nor is that the only 'reason' why adding a dedicated physX card may not help in certain HW PhysX-supported games.

I've messed around with PhysX games a LOT, and dedicated PhysX cards a LOT, and I'm here to tell you ... my semi-professional opinion is that technology in general is flaky as HELL. The need for programmers to code for lots of different potential HW configs (including Radeon Cards that don't run PhysX at all) has led to the technology being very unpredictable, IMHO. Every game works different, literally.

I can tell you that Mafia 2 benefits from a dedicated PhsyX card cause of the way it's coded. But most other games, for various reasons ... that's not true at all. Personally I would only throw it (your dedicated card I mean) in to your system when a new game comes out that you find through testing actually benefits, and leave it in while you're big on that particular game, then take it out when you're not. It's going to be so rarely useful that it's not worth the power and heat to leave it in all the time.
    
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post #5 of 8
Good, detailed info Bretjv

Save some of us potential wasted time...

I'd +rep you, but no button available on your post. I assume that's related to your being a mod. wink.gif
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post #6 of 8
Dedicated PhysX cards (and I'm talking a GeForce card made into a PhysX card) haven't been worthwhile since 2009. They were only needed for select few games when lacking GPU power. Every time a new generation of cards came out, the benefit of dedicated PhysX cards became smaller and smaller. It stopped being useful once you got into the high end GeForce 400 series. Plus, like brett said, every game is different. Cryostasis: Sleep of Reason uses dedicated PhysX cards more than any other game, last time I checked. Mafia 2 is up there as well.
Edited by boredgunner - 4/11/14 at 6:52pm
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post #7 of 8
Quote:
Originally Posted by vertical2 View Post

Good, detailed info Bretjv

Save some of us potential wasted time...

I'd +rep you, but no button available on your post. I assume that's related to your being a mod. wink.gif

I know, I always want to +rep a mod's post before I realize I can't frown.gif
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post #8 of 8
Thread Starter 
I reinstalled the new nvidia "wonder" driver, wiped it than installed, and now everything runs soooo much better. Last Light runs at straight 60 now no matter what!
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