hi, is there a way to know how much video ram is still left? or how consumed...
There is, however because each card uses the memory differently (how it stores textures, what overhead it includes, etc), its basically useless. Your API (DX, OGL) will handle those cases where you run out of vram by swapping in and out of normal ram. Its better to give your user the option of how much detail (texture size, quantity, screen resolution) rather than having your game figure it out from the available video memory.
If you still want to know how much vram is available, the answer is nicely explained in this thread.
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