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Can you use 2 PhysX cards?

post #1 of 18
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A 295 is going out here for 125, thinking about it. Never messed around enough to remember if a 295 would do PhysX on both GPUs.
    
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post #2 of 18
Pretty sure PhysX can only be dedicated to 1 core, so if you did get the 295 it could only use 1 of the 2 cores.
post #3 of 18
Thread Starter 
Quote:
Originally Posted by Yumyums;13793490 
Pretty sure PhysX can only be dedicated to 1 core, so if you did get the 295 it could only use 1 of the 2 cores.

Do you know for sure? I imagine it would be like that, but heck a 295 can't be that bad. Maybe cause use 1core for physx, and another core for a separate monitor to look up stuff and post while playing games(maps of levels, stuff like that).
    
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post #4 of 18
Physx used to to be able to be run on Gpu's in sli, and it would take advantage of both, if i remember correctly, but that was waaaaaaaaaaaaaaaaaaaaaaaaaaay back at the time of 18x.xx drivers, it does not now, as for a 295 for physx, that really is overkill, most people tend to use things such as 9600GT's, 9800GT's, 240GT's, GTS 450's.

Since physx really isn't all that demanding under current gaming work loads as i have seen, you can run a monitor off the physx gpu without problems.
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post #5 of 18
PhysX runs on one GPU core only. Always has, probably always will. Hence, if you use a GTX295 for physX, only half of it will get used for that task.

Side note: when you run physX on an SLI set, one of the two gpu's is slowed down by having to process the physX ... but then the other, non-physX card, has to slow down it's rendering to match the (remaining) rendering capacity of the physX card.

So basically, physX on SLI set hits you w/a 'double-dip' on performance ... the physX runs on only one, but the 'cost' of that processing is 'mirrored' onto the other card, even though it's not doing any physX.

Back on topic: you could indeed run another monitor off of the 295 even when it's doing physX, yes. As for whether it would 'use the other core' to do so ... I've no idea. Maybe, maybe not.
Edited by brettjv - 6/8/11 at 10:37am
    
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post #6 of 18
A 295 is a waste for PhysX cuz you'll only use one core.
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post #7 of 18
Quote:
Originally Posted by Rayleyne;13798309 
Physx used to to be able to be run on Gpu's in sli, and it would take advantage of both, if i remember correctly, but that was waaaaaaaaaaaaaaaaaaaaaaaaaaay back at the time of 18x.xx drivers, it does not now, as for a 295 for physx, that really is overkill, most people tend to use things such as 9600GT's, 9800GT's, 240GT's, GTS 450's.

Since physx really isn't all that demanding under current gaming work loads as i have seen, you can run a monitor off the physx gpu without problems.

Lol PhysX isn't that demanding? Since when? PhysX can sometimes cuz your framerates in half, depending on the game. I'd call that pretty demanding.

If it wasn't demanding, why would people have dedicated PhysX cards?
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post #8 of 18
Hey man, you are making an awesome educated guess because the 295 is a dual gpu card. However, Nvidia did a GREAT job with their drivers and while it is 2 gpu's it's an onboard SLI. While there are programs like GPU-Z that can differentiate between the 2 onboard gpu's, Nvidia's control panel/chipset drivers recognize it as one card so physx would run on both the onboard gpu's. HOWEVER! that does not mean all SLI systems can run discrete physx. If you had 3 PCI-e slots and ran a 580 and 2 GTX 260's...you could only use the 580 as discrete graphics and 1 of the 2 260's as physx. Nvidia knocked it outta the park with the 295 drivers in that regard biggrin.gif. GL HF! PM me if you have any other questions about that.
post #9 of 18
Quote:
Originally Posted by TheCondor13;13798446 
Hey man, you are making an awesome educated guess because the 295 is a dual gpu card. However, Nvidia did a GREAT job with their drivers and while it is 2 gpu's it's an onboard SLI. While there are programs like GPU-Z that can differentiate between the 2 onboard gpu's, Nvidia's control panel/chipset drivers recognize it as one card so physx would run on both the onboard gpu's. HOWEVER! that does not mean all SLI systems can run discrete physx. If you had 3 PCI-e slots and ran a 580 and 2 GTX 260's...you could only use the 580 as discrete graphics and 1 of the 2 260's as physx. Nvidia knocked it outta the park with the 295 drivers in that regard biggrin.gif. GL HF! PM me if you have any other questions about that.

Ummm ... I don't think so.

I owned three 295's back in the day, and I'm here to tell ya ... the 295 is, in every sense (aside from physically) ... 2 cards in SLI. The Control Panel works exactly the same with it as it does with two cards in SLI.

I'm pretty sure that if you go into the PhysX control panel running a 295, you'll have two cores to choose from to run physX on, and no option for the 295 as a whole. Unless things have changed since when I owned one wink.gif

Thus, I'm pretty sure that physX will run on only one of the two cores, exactly the same as if it were two physical cards.
Edited by brettjv - 6/8/11 at 10:45am
    
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post #10 of 18
Thread Starter 
Quote:
Originally Posted by Rayleyne;13798309 
Physx used to to be able to be run on Gpu's in sli, and it would take advantage of both, if i remember correctly, but that was waaaaaaaaaaaaaaaaaaaaaaaaaaay back at the time of 18x.xx drivers, it does not now, as for a 295 for physx, that really is overkill, most people tend to use things such as 9600GT's, 9800GT's, 240GT's, GTS 450's.

Since physx really isn't all that demanding under current gaming work loads as i have seen, you can run a monitor off the physx gpu without problems.

All those cards would bottleneck 2x6970s. Lol.
    
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