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Question about dedicated PhysX card.

post #1 of 12
Thread Starter 
I keep seeing this popping up in places that you can run a second GPU to use as a dedicated PhysX card.

Can someone explain this to me?

Not really bothered about doing it for myself although it would be nice to know if it was possible (for my setup) as I have a few nvidia cards laying round (sig rig for current set up details)

Thanks guy thumb.gif
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post #2 of 12
It's definitely feasible but not every game uses PhysX. It'd be only useful to have a dedicated PhysX cards if you play a lot of Nvidia sponsored game that uses the PhysX engine. Arkahm City and Borderlands 2 are games I can think of off the top of my head.

Also, if your GPU is already an Nvidia with PhysX capabilities it'd be useless to have a dedicated PhysX GPU.
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post #3 of 12
You would have to use modded drivers in order to use your nv-cards with your current 6850, and last time I checked, those drivers were pretty old rolleyes.gif
post #4 of 12
Thread Starter 
Ah well, thanks for your input guys,
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post #5 of 12
A dedicated physx card is exactly what it sounds like: an nvidia GPU (Or ageia co-processor if you have one) that runs Physx calculations for games and programs, freeing up the main GPU and the CPU for graphics and other calculations respectively.

To run one you'd need:
An nvidia graphics card that supports physx (duh. Card has to support DX10 or higher cause support for it started with the 8800 series)
an available PCI-E (or PCI if your card is new enough, zotac makes a GT 620 PCI card) slot
And in your case, a dummy plug so the nvidia card "thinks" there's a monitor attached as well as i think driver 185.xx or earlier. Any newer and it wont work due to nvidia blocking it when a different card is detected.

Its considerably easier to do it if your main card is nvidia though for obvious reasons. Just drop it in and use the nvidia control panel to set physx to the secondary card. Its what i did.

Either way once you have the card installed in a second slot, install the dummy plug on the physx card, install the driver, reboot, and if all goes well when you come back in the nvidia control panel should have set the secondary card to run physx.

There are some physx demo programs out there that you can download to run and verify that its working.
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post #6 of 12
Dummy plug isn't needed if running 2 Nvidia cards...

In fact, I had never even heard of dummy plugs before today.
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post #7 of 12
I've ran a dedicated Physx card along side my CF 6870's. I picked up and open box nvidia card just to do it. Just used a few modded files as it's a hybrid setup, AMD & Nvidia. No dummy plug necessary for me. It was rather straight forward. IMHO I just got some extra cool looking graphics. After playing with the setup for about a month I put the Nvidia card in my mothers PC.
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post #8 of 12
Once I get my Ultimate Rig into its new home, I'm debating on attempting to use one of my former 570s for Physx lol. Arkham City runs like frozen honey with Physx enabled and still not the greatest with it disabled.
 
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post #9 of 12
Quote:
Originally Posted by Majorhi View Post

IMHO I just got some extra cool looking graphics.

LOL, pretty much. The list of games that anyone would want to play that benefit from it is around ten or so. I just keep whatever card I've upgraded from around for the heck of it for when I do play PhysX titles.

I wouldn't really suggest anyone run out and buy a card solely for it though.
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post #10 of 12
Quote:
Originally Posted by Angrybutcher View Post

Once I get my Ultimate Rig into its new home, I'm debating on attempting to use one of my former 570s for Physx lol. Arkham City runs like frozen honey with Physx enabled and still not the greatest with it disabled.
It won't make a difference. If you disable DX11 and tweak the game a bit, you'll see some improvement in the FPS. That game is simply poorly optimized for PC.
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