Nvidia dedicated Physx

[OSBK]

i have a question guys about the dedicated physx. i know you can use any nvidia card as dedicated physx, but is it possible to use more then one gpu as dedicated physx. cause i do have 3 empty pci_e and i want to try some dumb tricks ?

[Naeaes]

Hmmmmmm. Maybe if you have SLI enabled. Is it still just the one card? Can't remember or verify on my own rig right now.

[Mohenjo]

[OSBK]

Hmmmmmm. Maybe if you have SLI enabled. Is it still just the one card? Can't remember or verify on my own rig right now.

i'm playing around with my secondary pc. the main GPU is a GTX780 and i have two other gpus a gtx 770 and gtx 960. i tried some benchmarks with the 780 as main gpu and the 770 as dedicated physx and the results were just great. when i use the 960 as dedicated physx i did notice a little performance reduce. and i'm asking if i can use both 770 and 960 as dedicate physx

[Naeaes]

i'm playing around with my secondary pc. the main GPU is a GTX780 and i have two other gpus a gtx 770 and gtx 960. i tried some benchmarks with the 780 as main gpu and the 770 as dedicated physx and the results were just great. when i use the 960 as dedicated physx i did notice a little performance reduce. and i'm asking if i can use both 770 and 960 as dedicate physx

Yeah, well off the top of my head, I'd say no. At least the setting in the control panel is one GPU at a time. But I can't remember if that's the case still if SLI is enabled. I mean, maybe SLI also splits the PhysX workload. Knowing Nvidia, the ability to multi-thread PhysX could be there, but just un-enableable. (I made up the word myself) I mean, they did the same with mobile V-Sync for example. But if the programming base isn't there, you're not gonna get it with a registry hack or anything simple like that. I don't know the inner workings of physX enough to even tell if it's possible to multi-thread it. It just occurred to me, how you could do a simple test. Set your CPU for PhysX and see if running a physics test utilizes several CPU cores. I'd imagine if it does on CPU, why not on GPU...

[OSBK]

Yeah, well off the top of my head, I'd say no. At least the setting in the control panel is one GPU at a time. But I can't remember if that's the case still if SLI is enabled. I mean, maybe SLI also splits the PhysX workload. Knowing Nvidia, the ability to multi-thread PhysX could be there, but just un-enableable. (I made up the word myself) I mean, they did the same with mobile V-Sync for example. But if the programming base isn't there, you're not gonna get it with a registry hack or anything simple like that. I don't know the inner workings of physX enough to even tell if it's possible to multi-thread it. It just occurred to me, how you could do a simple test. Set your CPU for PhysX and see if running a physics test utilizes several CPU cores. I'd imagine if it does on CPU, why not on GPU...

i'm not sure about sli but i'll give it a try, i think that sli use both gpus physx like cuda but i'm not sure. cause there is no option in the control center to select wich gpu from the sli gpus to use for physx it just go with the main one