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Why is this happening?

post #1 of 12
Thread Starter 
I got my GTX 580 today and was doing some testing with one of my 260s as a dedicated PhysX card and found something very odd going on

Why is GPU2's (the 260) memory filling up on non PhysX games?

Anything I run fills both GPUs memory to the same amount. I don't understand this I thought it only did that in SLi

I was told using a 260 for PhysX with a 580 for rendering would lower my performance and I think this might be why

Is there anyway to change it so only GPU1's memory get's used and the 260 works as JUST a PhysX card (I realize there would be some memory usage for that)

And please don't tell me how few games support it I KNOW. I do play pretty much all of them though so I wanted the best rendering+PhysX experience possible with what I have on hand....

Anyway thanks in advance to all those who have good info or suggestions
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post #2 of 12
The only thing I can think of is to go to your Nvidia Control Panel and Set Physx Processor to your 260.

Start Menu,then type Nvidia Control Panel
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post #3 of 12
Quote:
Originally Posted by Tristanguy1224 View Post
I got my GTX 580 today and was doing some testing with one of my 260s as a dedicated PhysX card and found something very odd going on

Why is GPU2's (the 260) memory filling up on non PhysX games?

Anything I run fills both GPUs memory to the same amount. I don't understand this I thought it only did that in SLi

I was told using a 260 for PhysX with a 580 for rendering would lower my performance and I think this might be why

Is there anyway to change it so only GPU1's memory get's used and the 260 works as JUST a PhysX card (I realize there would be some memory usage for that)

And please don't tell me how few games support it I KNOW. I do play pretty much all of them though so I wanted the best rendering+PhysX experience possible with what I have on hand....

Anyway thanks in advance to all those who have good info or suggestions
Hmm, for the brief time I ran my 460 w/a 9800GT as physX I never saw this happen. Are you certain the 260 is selected as the dedicated physX card in your nV drivers? IIRC it doesn't usually default properly and actually needs to be manually set.
post #4 of 12
Yeah...as stated above...nv control panel, select 260 for physx and tick the dedicate to physx marker.
post #5 of 12
Thread Starter 
Quote:
Originally Posted by Booty Warrior View Post
Hmm, for the brief time I ran my 460 w/a 9800GT as physX I never saw this happen. Are you certain the 260 is selected as the dedicated physX card in your nV drivers? IIRC it doesn't usually default properly and actually needs to be manually set.
Yes I set the 260 as PhysX I should have been more specific.

even if it weren't set that way the only way both cards should have the same memory usage is under SLi and 580+260 won't do SLi the option isn't even there

Is it possible Precision isn't reading memory usage correctly?
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post #6 of 12
Thread Starter 
Quote:
Originally Posted by mongoloid View Post
Yeah...as stated above...nv control panel, select 260 for physx and tick the dedicate to physx marker.
There is no Dedicate to PhysX checkbox. I do remember seeing that when I had both 260s running together I could (if SLi was disabled) check "Dedicate to PhysX"

I think they might have changed it for the new drivers, I'm using 266.58
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post #7 of 12
i dont think it is a checkbox go to set physx configuration and change the dropbox to the 260
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post #8 of 12
Thread Starter 
Quote:
Originally Posted by labbu63 View Post
i dont think it is a checkbox go to set physx configuration and change the dropbox to the 260
What I was saying is that I have done that in the NV control panel it has a drop down where I can choose between CPU, GTX 580, and GTX 260.

I chose GTX260. I was commenting that there used to be a checkbox that said "Dedicate to PhysX" it is no longer there but I have selected the 260 from the dropdown

I'm still seeing memory usage identical to the 580's on the 260 and it doesn't make sense.

I'm going to test again but this time I'll be using GPUz to see memory controller load and usage
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post #9 of 12
If its working as it should leave it, if its not then fix it.
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post #10 of 12
Thread Starter 
I guess it must be EVGA Precision because I just ran GTA IV and Precision said they were using the same amount of memory but GPUz showed 0% memory controller load on GPU2 and temps stayed roughly what they would be idle

I think I trust GPUz a little more than Precision guess I should have checked that first I've just been using Precision so long and have had such good experiences with it I got too trusting....

Maybe I should email EVGA about this see what they say and maybe future version won't have that issue

I appreciate all the help though thanks
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