smckechnie
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I recently upgraded my GPU to 2 x GTX 780Ti Calssified in SLI replacing my existing GTX 680 Classified. In the NVidia Control panel I see it's possible to dedicate a GPU to PhysX so my question is would it be possible from me to also install my GTX680 in a 3-way SLI config with the 2 GTX780Ti's and dedicate it to PhysX? Would this provide a performance gain?
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Pippo68
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Re: Dedicated GPU for PhysX
Sunday, April 06, 2014 7:45 AM
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Hello smckechnie, You don`t need 3-way SLI for dedicated Physx. Just install your Gtx 680 without any SLi bridge. Only your 780`th still need a two way bridge. After that you check in Nvidia Control Panel the configuration of GPU-Physx. Finish. You will not get performance gain in any game, there are only some games for example Metro 2033, Metro Last Light, Borderlands 2 and Mirrow`s Edge. Hope my comment is helpfull for you  Pippo68
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lowe0
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Re: Dedicated GPU for PhysX
Sunday, April 06, 2014 10:33 PM
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Overkill. If I had room for a dedicated card, a 750 would be more than enough. But with two 780 Tis, I'm not sure a PhysX card is even necessary. That's a lot of headroom.
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HeavyHemi
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Re: Dedicated GPU for PhysX
Monday, April 07, 2014 1:49 AM
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lowe0
Overkill. If I had room for a dedicated card, a 750 would be more than enough. But with two 780 Tis, I'm not sure a PhysX card is even necessary. That's a lot of headroom.
You'd be surprised. A properly sized PhysX GPU, helps even more in SLI. While with SLI you might have higher average frame rates the percentage hit is even higher when running PhysX. The reason being is to maintain frame to frame timing, the GPU not running PhysX has to wait on the GPU that is processing PhysX to context switch from processing PhysX back to rendering. While newer GPU perform this faster, there is still a significant performance hit, in some cases almost a 50% reduction in FPS. In Batman AO for example, before the latest patch, you'd actually get slightly better performance running single GPU with the other GPU running PhysX. The word 'necessary' is a bit tricky. If he's satisfied with his frame rates, then it isn't necessary. If he's looking for another 20-25% increase in frame rates using a 650Ti or a 750Ti...well that might be useful for someone looking to maintain over a minimum of 60 FPS depending upon resolution, AA and detail settings. I agree the GTX 680 is overkill. I was running a GTX 580 with my TITANS for quite awhile. While it worked fine, the full size GPU blocked a lot of airflow and used too much juice when sitting idle. So I bought a 650ti, flashed it to 1176mhz and it works better than the 580 and due to its small size doesn't block the intake on the TITAN. In the end though, it is a matter of preference. The limited titles that use PhysX is also a consideration.
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donta1979
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Re: Dedicated GPU for PhysX
Monday, April 07, 2014 1:52 AM
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With your current setup a dedicated PhysX card is not needed.
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smckechnie
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Re: Dedicated GPU for PhysX
Tuesday, April 08, 2014 1:49 PM
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Thanks for the advice.
Yes, space is tight so airflow might be an issue. I figured that there must be some hit on the card also running PhysX and as I already have the GTX 680 spare I will try installing it and see if there is any performance gain.
Any recommendations for GPU benchmarking over and above 3DMark?
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HeavyHemi
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Re: Dedicated GPU for PhysX
Tuesday, April 08, 2014 4:06 PM
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smckechnie
Thanks for the advice.
Yes, space is tight so airflow might be an issue. I figured that there must be some hit on the card also running PhysX and as I already have the GTX 680 spare I will try installing it and see if there is any performance gain.
Any recommendations for GPU benchmarking over and above 3DMark?
I'm not sure, who you're responding to but 3Dmark should see little or no difference as it doesn't use PhysX at all. Mafia II, Metro: Last Light and Batman: Arkham Origins are titles that will show a substantial gain in performance using a dedicated PhysX GPU. All three also have built in game benches so you can easily perform comparisons.
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the_Scarlet_one
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Re: Dedicated GPU for PhysX
Tuesday, April 08, 2014 4:20 PM
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HeavyHemi
smckechnieThanks for the advice. Yes, space is tight so airflow might be an issue. I figured that there must be some hit on the card also running PhysX and as I already have the GTX 680 spare I will try installing it and see if there is any performance gain. Any recommendations for GPU benchmarking over and above 3DMark?
I'm not sure, who you're responding to but 3Dmark should see little or no difference as it doesn't use PhysX at all. Mafia II, Metro: Last Light and Batman: Arkham Origins are titles that will show a substantial gain in performance using a dedicated PhysX GPU. All three also have built in game benches so you can easily perform comparisons.
How is the game bench run? Do I need to complete it one Time through to run the bench? I have never used an in game bench is why I ask.
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HeavyHemi
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Re: Dedicated GPU for PhysX
Tuesday, April 08, 2014 4:43 PM
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Scarlet-Tech
HeavyHemi
smckechnieThanks for the advice. Yes, space is tight so airflow might be an issue. I figured that there must be some hit on the card also running PhysX and as I already have the GTX 680 spare I will try installing it and see if there is any performance gain. Any recommendations for GPU benchmarking over and above 3DMark?
I'm not sure, who you're responding to but 3Dmark should see little or no difference as it doesn't use PhysX at all. Mafia II, Metro: Last Light and Batman: Arkham Origins are titles that will show a substantial gain in performance using a dedicated PhysX GPU. All three also have built in game benches so you can easily perform comparisons.
How is the game bench run? Do I need to complete it one Time through to run the bench? I have never used an in game bench is why I ask.
Which game bench are you asking about? In Mafia II and Batman: Arkham Origins, you access it in the game menu. Mafia II has much better results on the second run. Batman AO seems to be very consistent run to run. For Metro: Last Light the Benchmark.exe is located in the main game directory typically...YourDriveLetter:\Steam\steamapps\common\Metro Last Light. By default the Metro Bench will run using the settings you have in the game. However, it doesn't hurt to check the options you want to run the Bench with are set. When the bench is done running for Metro it will display a report that is typically saved in C:\Users\YourUserName\Documents\4a games\Metro LL\Benchmark. If you have Metro: 2033 it is essentially the same. None of these games require you to play the game to run the bench.
post edited by HeavyHemi - Tuesday, April 08, 2014 4:52 PM
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rjohnson11
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Re: Dedicated GPU for PhysX
Tuesday, April 08, 2014 4:56 PM
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If you wish to dedicate a GTX 680 to PhysX then that should be fine however make sure that you have good airflow for three cards. Otherwise two GTX 780ti cards without the GTX 680 for PhysX will still be a great gaming combo.
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the_Scarlet_one
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Re: Dedicated GPU for PhysX
Wednesday, April 09, 2014 2:50 AM
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HeavyHemi
Which game bench are you asking about? In Mafia II and Batman: Arkham Origins, you access it in the game menu. Mafia II has much better results on the second run. Batman AO seems to be very consistent run to run. For Metro: Last Light the Benchmark.exe is located in the main game directory typically...YourDriveLetter:\Steam\steamapps\common\Metro Last Light. By default the Metro Bench will run using the settings you have in the game. However, it doesn't hurt to check the options you want to run the Bench with are set. When the bench is done running for Metro it will display a report that is typically saved in C:\Users\YourUserName\Documents\4a games\Metro LL\Benchmark. If you have Metro: 2033 it is essentially the same. None of these games require you to play the game to run the bench.
Perfect. I have Crysis 3 and Batman AO right now, as well as trying to find city and asylum for cheap on download. I will test out with and with ASAP.
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_Nite_
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Re: Dedicated GPU for PhysX
Wednesday, April 09, 2014 2:56 AM
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the 680 is not worth the heat/power usage for PhysX use, if you want a PhysX card then buy a 750 TI Maxwell. (only 60w and run really cool)
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Noodle Gaming
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Re: Dedicated GPU for PhysX
Wednesday, April 09, 2014 1:29 PM
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Yea definitely put your cpu at physX I'm running 3x Ti's and when Im running benchmarks my system is faster with he cpu running physx than if i put my 3rd GPu in charge of it.
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bdary
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Re: Dedicated GPU for PhysX
Wednesday, April 09, 2014 2:42 PM
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Noodle Gaming
Yea definitely put your cpu at physX I'm running 3x Ti's and when Im running benchmarks my system is faster with he cpu running physx than if i put my 3rd GPu in charge of it.
The CPU is much slower than a GPU to process PhysX. If you play a game the uses PhysX and dedicate your CPU as the PhysX processor, you'll greatly hinder performance in that game. Your GPU(s) will be waiting a lot for the CPU to catch up. If you're not doing anything that uses PhysX, then it makes no difference how you set PhysX up.
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bigmac121
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Re: Dedicated GPU for PhysX
Wednesday, April 09, 2014 8:39 PM
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was thingking the same thing! i have a classi..wha be need to run Phys ex. I saw a 570 for £95.00?
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NeoCrisis
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Re: Dedicated GPU for PhysX
Wednesday, April 09, 2014 10:13 PM
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The talk about dedicated PhysX cards were during the 8xxx, 9xxx, 2xx series cards that only had a max cuda core count 240.
780ti have 2880 cuda cores. No need for a dedicated card for PhysX just set it to auto.
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bdary
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Re: Dedicated GPU for PhysX
Wednesday, April 09, 2014 10:42 PM
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_Nite_
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Re: Dedicated GPU for PhysX
Wednesday, April 09, 2014 10:48 PM
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NeoCrisis
The talk about dedicated PhysX cards were during the 8xxx, 9xxx, 2xx series cards that only had a max cuda core count 240.
780ti have 2880 cuda cores. No need for a dedicated card for PhysX just set it to auto.
You are wrong, look at my results here on Mafia II with a GTX 770 (1536 cores) and GTX 460 (336 cores) with 84fps avg http://forums.evga.com/FindPost/2125809 This post here is someone who has a 780 TI (2880 cores) and GTX 660 FTW (1336 cores) got 96fps avg http://forums.evga.com/FindPost/2125791
post edited by _Nite_ - Wednesday, April 09, 2014 11:21 PM
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Sprinx
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Re: Dedicated GPU for PhysX
Wednesday, April 09, 2014 10:53 PM
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I tested a 9800 GTX+ as dedicated PhysX with my EVGA GTX 680 SC, and it actually hurt my scores in Arkham City and Arkham Asylum benchmarks. Granted the generation gap is much wider there, but just to note that going too low with a PhysX card will hurt FPS.
But yeah, you should sell your 680 as it's a waste of space as a PhysX card with 780s in SLI.
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sk2play 
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Re: Dedicated GPU for PhysX
Thursday, April 10, 2014 5:50 AM
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I can't remember. . . . If you put a Physx card in a PCIe slot on a MB, does it take up lanes. For example, on my Hero VI, one GPU=16 lanes 3.0. If I add another to SLI, it changes the GPU=8 lanes 3.0 each. Does a dedicated Physx card change the lanes as well? If I put it in a 2.0 PCIe slot, would it hinder performance as a Physx card?
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_Nite_
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Re: Dedicated GPU for PhysX
Thursday, April 10, 2014 8:04 AM
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sk2play
I can't remember. . . . If you put a Physx card in a PCIe slot on a MB, does it take up lanes. For example, on my Hero VI, one GPU=16 lanes 3.0. If I add another to SLI, it changes the GPU=8 lanes 3.0 each. Does a dedicated Physx card change the lanes as well? If I put it in a 2.0 PCIe slot, would it hinder performance as a Physx card?
my EVGA Z68 SLI was designed to have a PhysX card, Slot 1 and 2 run at 16x (single) or 8x (dual cards) while the third slot is just a 4x slot (enough for PhysX) my board is only PCI-E 2.0 as well, so no it won't hurt performance on a 2.0 slot.
post edited by _Nite_ - Thursday, April 10, 2014 8:11 AM
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HeavyHemi
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Re: Dedicated GPU for PhysX
Thursday, April 10, 2014 2:42 PM
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sk2play
I can't remember. . . . If you put a Physx card in a PCIe slot on a MB, does it take up lanes. For example, on my Hero VI, one GPU=16 lanes 3.0. If I add another to SLI, it changes the GPU=8 lanes 3.0 each. Does a dedicated Physx card change the lanes as well? If I put it in a 2.0 PCIe slot, would it hinder performance as a Physx card?
The answer is yes. It is treated like any other GPU as far as using lanes. The main difference being you can use a PhysX GPU in a x4 PCIe slot while GPU's in SLI need a minimum x8 slot. Using a 2.0 slot should not impact PhysX performance.
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sk2play
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Re: Dedicated GPU for PhysX
Friday, April 11, 2014 5:46 AM
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Thanks Nite and HeavyHemi. The only game I've been disappointed with of late, is Metro Last Light, with Physx turned on. I don't think a dedicated Physx card will smooth out the problems though in that game.
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Vlada011
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Re: Dedicated GPU for PhysX
Friday, April 11, 2014 5:57 AM
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Yes 9800 is really old card. I think I look some review and best models for PhysX are GTX640/GTX650/GTX650Ti and maybe GTX750.
Result will be same as GTX580 and GTX680. Special if card don't need power connectors and cost under 100$. But really someone who have over GTX780 don't need PhysX card at all. Only if NVIDIA decide to improve PhysX on higher level.
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