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Ok, here's some more interesting findings:

This is the Vram situation when rendering an empty scene. Please note the engine runtime, geometry and unavailable ram usage: This is the vram after adding a default cube to the scene and rendering: The only difference between the two scenes is the geometry which went from 4 bytes to 5.9kb. The weird thing is the unavailable vram shot up from 1.1gb to 1.9gb. I cant wrap my head around this. Is Octane using some additional vram here and showing it as unavailable? Is windows upping its vram reserve just because im rendering a cube instead of an empty scene? No idea what's going on here.

Hi,
interesting, but please consider that it follows the Total available device memory, and in your case, there is a difference of ~800MB, so, 1.1 + 0.8 = 1.9.

I have done the same experiment here, and the difference between an empty scene, and a simple cube is only 1MB: ciao Beppe

Hi Beppe, thanks for your reply.

What im trying to understand is how come you get 100mb difference while I get 800mb?

Between the empty scene and cube i dont run any other software that grabs vram and this test is quite repeatable.

Really confusing.

Engine Runtine Data is always near 1GB at start...