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Hi guys

For a while I have been using single Asus GTX 1070 and octane on my working machine
And Octane's framebuffer has been showing me about 6GB available memory (for example: GPU Mem [GB] 1.062/5.9)
So my thoughts were that hence I'm using only one GPU - windows also require some vram and that's why Octane showing less number than GPU have
But today I have purchased Asus GTX 1080Ti which has 11GB of VRAM and Octane buffers shows me 8.5 Gb of available memory while rendering (for example: GPU Mem [GB] 1.734/8.590)
When I'm using both videocards at the same time it is showing me 6.3GB of available VRAM, so once again it is not 8gb of memory which has GTX 1070

So my question - Is it just a glitch in displaying or octane actually doesn't see 20% of my VRAM and how to fix it?

Also correspoding to data of GPU-Z both videocards don't rendering at 100% load, performance has high and low picks and lays down within range from 60% to 90% percent and this is not changing when I'm using both or one GPU
So how can I fire render at the full speed?

I've attached some screenshots

Thank you

this should help viewtopic.php?f=12&t=51992

Hi coilbook,
It depends on two factors:
1 you are probably using windows 10
2 The GPU that controls the monitor is also used for Octane render.
So you will have 20% Vram eaten by window10 + screen memory eaten.
All this does not depend on Octane render.
solution:
Install windows 7
Use 1 GPU (an integrated GPU is also ok) only for monitor and Opengl software (e.g. Chrome) and exclude it from Octane Render
Regards
Paride