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I am trying to understand all the factors that effect RAM use so I can get the most out of my graphics cards VRAM when rendering. I understand that the amount of geometry and the resolution of textures make a big difference. However, I do not understand why render resolution does. Can anyone explain why?

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The image that is rendered need to go in the ram, so bigger image need more ram, have a look here: View Memory Usage There are other points like adaptive subdiv, but I'm not a specialist of these kind of questions.

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