Computer lagging when using RT Gpu

[Jeroen Prins]

Hi, i just got myself a GTX Titan

I'm kind of new to RT GPU and doing some simple (for now) tests.
I'm planning to do some (heavy) Architectural indoor and exterior testing later on to see what RT is capable of.

If i activate the active shade with GPU engine CUDA (single kernel) my gpu is going 100%.
The problem is that the rest of my computer is getting poor gpu performance, even internet scrolling, 3ds max toolbars disappear and refresh really slowly..
Rendering with CPU i can easily reassign a processor but with GPU i can't.

If this the normal workaround?


I got the newest drivers Nvidia 320.49.

[Jeroen Prins]

The preview is incredible damn fast
but I can hardly change materials or do anything.

cpu = 11%

specs;
Win 7 64bit Sp1
i7-3930 K
24 GB
2x 24inch Screens
GTX Titan
PSU 850w

[matanov]

The easiest way to get everything else fast and responsive is to lower the "rays per pixel" parameter to 2-3 , but then you wouldn't use your GPU at full power

[Jeroen Prins]

Well atm the GPU at full power means either a lot of crashes (3ds max & vray), monitor adapter errors or working very very slow with disappearing toolbars & buttons in max. Basically means i cannot change anything to the scene.

"rays per pixel" is the way to control how much % the card is working?

I personally think there is something wrong with the drivers or maybe the bios.
Is there a way i can test to see if my card is working properly?

[Dariusz Makowski (Dadal)]

Heya

Uhh thats strange problem... The way rays per pixel work as far as I know its bassically the size of the chunk of data u get from GPU. Big rays = big chunk of data a lot of calculation - rare preview refresh. Small Rays = faster preview refresh, less chunk of data to claculate there fore gpu is more responsible and u can use it for window. U also will lose few % from full power of GPU.

I think u could try Prime95 to test some components. Basically use different benchmarks to test different components of ur system to determine which one is causing issues...

[Svetlozar Draganov]

Another solution would be to plug you old GPU adapter and exclude it from Cuda rendering - as a result Vray will compute with Titan card and the other adapter will be used for all other GPU requests.

[Jeroen Prins]

Thanks for the replies!

My old GPU was an Ati, i don't want to mix those .
On another forum i work more on the technical side of the problem, bios update, drivers issues? and maybe a fresh install of windows.

Are there any Titan users who counter the same problem with 100%gpu load?

[Alan Iglesias]

The preview is incredible damn fast
but I can hardly change materials or do anything....

I routinely drop the Ray Bundle Size to 128 and the Rays Per Pixel to 8 when uing RT/GPU, Jeroen. This does a good job of freeing up a usable amount of interactivity while not significantly slowing down render times.

Hope this helps,

-Alan

[Jeroen Prins]

Thanks Alan, i think i just have to do some more testing with different settings the upcoming day's.

[Leon_Stoop]

Hi Jeroen,

Did the testing provide any answers?

Leon

[Jeroen Prins]

Hi Leon,
I was having three other problems which needed to be fixed last two weeks, so i hadn't the time to do some proper testing
Next week i've time. Lowering the Ray Bundle Size to 128 and the Rays Per Pixel to 8 was helping allot from the last test i did.

groet,